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Prepared By Travis Smith
Released By Nick Canto
Date 15 March 2013
Job Number 13-024
Document Name 13-024 SWMP Carpark
Version 1.0.
Approved for release by:
Nick Canto
RPEQ 6750
15 March 2013
STATEMENT OF LIMITATION
Data and conclusions of this report are the findings and opinions of icubed consulting and are
not an expressed or implied representation, warranty or guarantee. This report has been
prepared for Multispan Australia.
Pagel2
Level Z, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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TABLE OF CONTENTS
1, Introduction .....................................................................................................................................................
5
1.1 Background.................................................................................................................................................5
1.2 Objectives ...................................................................................................................................................5
1.3 Scope..........................................................................................................................................................5
2. Location............................................................................................................................. .............................
6
3. Site Hydrology............................................................................................................................. ...................
7
3.1 Method and Approach.................................................................................................................................7
4. Water Quality................................................................................................................................... ...............
8
4.1 Construction Phase.....................................................................................................................................8
4.2 Operational Phase ......................................................................................................................................9
4.3 Selection of Storm water Management Options...........................................................................................9
4.4 Catchment Annual Pollutant Loads...........................................................................................................1 0
4.5 Selection of Storm water Treatment Options .............................................................................................11
4.5. 1 Bioretention Basins.................................................................................................................................. .11
4.6 Treatment Train effectiveness in Pollution Reduction.... .............................12
..............................................
5. Maintenance ...........................................................................................................
......................................
13
5.1 Bioretention Basins...................................................................................................................................13
6. Conclusion............................................................................................................................. .......................
15
7. Reference List............................................................................................................................................... 16
Appendix A -
Drawings............................................................................................................................................... 17
Appendix B -
Calculations.......................................................................................................................................... 18
Appendix C Music Output........................................................................................................................................ 19
-
Appendix D -Checklists......................................................................................................................... .....................
20
PageJ3
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 0738708988
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LIST OF FIGURES
Figure 1: Locality Plan, (2013,Copyright Google Maps) -
Not to scale, generally indicative only............................ 6
Figure 2: Aerial Photo, (2013,Copyright Google Earth) -
Not to scale, generally indicative only.............................6
LIST OF TABLES
Table 1: Catchment and Flow. .....................................................................................................................................
7
Table 2: Stormwater Quality Objectives for the Site. (Operational Stage) ...................................................................
9
Table 3: MUSIC Model Parameter Summary............................................................................................................. 10
Table 4: Annual Pollutant Loads and Concentrations ................................................................................................
10
Table 5: Bioretention Basin MUSIC Parameters ........................................................................................................11
Table 6: MUSIC Output Results .................................................................................................................................
12
Table 7: Drawings prepared by i3 consulting pty Itd ....................................................................................................
17
Table 8: Discharge Calculation Table ........................................................................................................................
18
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1. Introduction
1.1 Background
i3 consulting was commissioned by Multispan Australia to undertake the stormwater quality documentation required
for the development approval application for the proposed development at Lot 94 Rufous Street, Peregian Beach.
This report covers the stormwater quality for the community house carpark for the development approval. The
proposed development is shown on drawing 13-024-C31 in Appendix A.
1.2 Objectives
This report has been compiled to address the stormwater quality and quantity requirements of the Water Sensitive
Urban Design Guidelines for South East Queensland, the Environmental Protection Act 1994 and the Environmental
Protection (Water)Policy 1997.
1.3 Scope
The scope of this report encompasses in detail the post construction phase of development; however the
construction phase is briefly addressed.
Page 15
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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2. Location
The proposed development is located on Lot 94 on SP137431. The street address is defined as 5-7 Rufous Street,
Peregian Beach. The eastern boundary fronts an existing carpark for the Community House and the western fronts
on to Rufous Street.
The northern boundary fronts a Telstra exchange building and the southern boundary fronts an
access easement and tennis centre.
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Figure 1: Locality Plan, (2013,Copyright Google Maps) Not to scale, generally indicative only.
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Source: Google Maps
Figure 2: Aerial Photo, (2013,Copyright Google Earth) -
Not to scale, generally indicative only.
Source: Google Maps
PagelS
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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3. Site Hydrology
3.1 Method and Approach
The stormwater discharges from this site were calculated using the rational method. This method as described in the
Queensland Urban Drainage Manual (QUDM)is commonly used in municipal hydrology and is more than adequate
for the design requirements. The Rational Method is based around the Rational formula:
Q=-
C/lyA
y
360
Where: Qy = Peak flow rate (m3/s)for the average recurrence interval (ARI)of y years
Cy = Coefficient of runoff for ARI of y years
A = Area of catchment (ha)
t
I =
Average rainfall intensity (mmlhr)for design duration of t hours and
y
an ARI of y years.
When designing the stormwater drainage system the following points have been considered:
Storm water treatment shall be designed for a 3 month storm event, calculated as Q1 x 0.5; and Stormwater
reticulation is to cater for Q3 month, Q20 and Q100 storm events.
For the purposes of this stormwater quality assessment, the area of the proposed development requiring stormwater
quality treatment has been divided up into 1 catchment:
Table 1 details catchment names, areas and storm event flows for the catchment based on the Rational Formula.
Refer to Appendix B for details of catchment calculations and Appendix A, drawing 13-024-C34, for catchment areas.
Table 1: Catchment and Flow
Catchment Catchment Area Ql00 Major Flow Q20 Minor Flow Q3 month Treatable Flow
Catchment E 0.1743 ha 0.153 m3/s 0.111 m3/s 0.021 m3/s
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4. Water Quality
4.1 Construction Phase
Potential exists during the construction phase for sediment to become mobilised by stormwater as suspended solids
from the erosion of exposed soil areas and stockpiles, and as a result of spillages from construction and plant
operations.
Stormwater quality during the construction phase of the development should be addressed in an Erosion and
Sediment Control Plan. The plan should address construction phase erosion and sediment control issues in
accordance with the Institute of Engineers Australia (Qld)Erosion and Sediment Control Guidelines. The Erosion and
Sediment Control Plan should also be in accordance with the Water Sensitive Urban Design Guidelines for South
East Queensland.
The following measures should generally be implemented prior to the commencement of construction:
Education of all site workers in sediment and erosion procedures;
Specified storage areas for construction materials and plant that are bunded to prevent any spillages from
escaping; and
Construction of silt fences and catch drains adjacent to the downstream boundaries to divert runoff to temporary
sediment basins.
The following measures should be implemented during the construction phase of the project:
Temporary sedimentation basins should be constructed in accordance with Council’s requirements;
Silt fences should be erected downstream of all disturbed areas; and
All erosion and sediment control devices should be regularly inspected and maintained following storm events.
PagelB
Level 2, 39 Sherwood Road [email protected] P: 0738708888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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4.2 Operational Phase
During the operational stage of the development, the following impacts have been identified in relation to stormwater
runoff and water quality of the receiving waterways:
Potential exists for gross pollutants which include human derived litter, course sediment and vegetation affecting
the drainage capacity of stormwater systems. Gross pollutants are also typically unsightly reducing the visual
amenity of the site. Gross pollutants can also physically affect the downstream waterway habitats and
organisms such as entangling birds and marine animals in plastic;
Sediment and Suspended Solids can become mobilised by stormwater as suspended solids from the erosion of
exposed soil areas, un-mulched garden beds and sediment deposited on car park and hardstand areas by
vehicles and by atmospheric deposition of sediment. Sediment can affect receiving waterways physically
through smothering aquatic flora and fauna. Sediments can also block stormwater systems leading to local
flooding. Suspended solids may also be used as a transport medium for nutrients and heavy metals making
their way into waterways; and
Nutrients can enter the waterways from stormwater runoff through many sources including, detergents used in
car washing, fertilizers from landscaping and lawn areas, nitrous oxide deposition from vehicle exhausts, and
organic waste. Large nutrient levels can lead to eutrophication of the receiving waterways resulting in algal
blooms and excessive macrophyte growth.
Implementation of the appropriate SQID’s would ensure that stormwater leaving the developed site shall be
acceptable to Healthy Waterways, Water Sensitive Urban Design Guidelines for South East Queensland’s
requirements.
4.3 Selection of Storm water Management Options
The Performance Criteria required to be met for discharges from development sites during the ’operational’ (post-
construction) phase of the development is detailed in Table 2.2 of the Urban Stormwater Quality Planning Guidelines
2010.
The load-reduction targets that must be achieved when assessing the post-developed sites treatment train,
(comparison of unmitigated developed case versus developed mitigated case) are listed in Table 2.
Table 2: Storm water Quality Objectives for the Site. (Operational Stage)
Pollutant Issues Load Reduction Objectives (%)
Total Suspended Solids 80
Total Phosphorus 60
Total Nitrogen 45
Total Gross Pollutants 90
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4.4 Catchment Annual Pollutant Loads
An assessment of stormwater quality was undertaken for the developed unmitigated site. The discharge
concentrations of key pollutants from the site were then compared to the wao’s. The pollutant concentrations were
obtained by running a MUSIC model with the model parameters sourced from Water by Design Music Modelling
Guidelines (Version 1.0 2010). MUSIC is the Model for Urban Stormwater Improvement Conceptualisation,
developed by the MUSIC Development Team of the CRC for Catchment Hydrology.
MUSIC has the ability to simulate quality of runoff from catchments ranging from a single house block up to many
square kilometres, and the effect of a wide range of treatment facilities on the quality of runoff downstream. By
simulating the performance of storm water quality improvement measures, MUSIC determines if proposed systems
can meet specified water quality objectives.
Table 3 details the MUSIC parameters utilised in running the model.
Table 3: MUSIC Model Parameter Summary
Meteorological Data 40059 COOROY
1973-1983 6 minute BOM
Source Node Commercial
Effective Impervious Area Varies
Effective Pervious Area Varies
Modelling Time Steps 6 Minute
Drainage Link No Routing
Pollutant Concentration Industrial
Soil Properties Industrial
Treatment Devices Stormwater360 Enviopod
Stormwater360 Stormfilter System
Rainwater Tank
MUSIC calculated the following annual pollutant loads for the 1 combined catchment:
Table 4: Annual Pollutant Loads and Concentrations
Pollutant Annual Load
Total Suspended Solids 998 kg/yr
Total Phosphorus 1.74 kg/yr
Total Nitrogen 8.11 kg/yr
Total Gross Pollutants 59.0 kg/yr
The above loads have been based on land use as a commercial site as designated in the the Water by Design
Pollutant Export Parameters for split catchment land use (log10 values) Table 3.8 P.16.
P age 110
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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4.5 Selection of Stormwater Treatment Options
Based on the understanding of Sunshine Coast Regional Council’s requirements for stormwater quality treatment for
commercial sites Bioretention Basins have been utilised as the SQID’s for this site.
4.5.1 Bioretention Basins
Bioretention basins are vegetated areas where runoff is filtered through a filter media layer as it percolates
downwards. It is then collected via perforated under-drains and flows to downstream waterways or to storages for
reuse. Bioretention basins often use temporary ponding above the filter media surface to increase the volume of
runoff treated through the filter media. They treat stormwater in the same way as bioretention swales; however,
’above design’ flows are conveyed through overflow pits or bypass paths rather than over the filter media. This has
the advantage of protecting the filter media surface from high velocities that can dislodge collected pollutants or
scour vegetation.
Bioretention basins operate by filtering stormwater runoff through densely planted surface vegetation and then
percolating runoff through a prescribed filter media. During percolation, pollutants are retained through fine filtration,
adsorption and some biological uptake. The vegetation in a bioretention system is a vital functional element of the
system providing a substrate for biofilm growth within the upper layer of the filter media. Vegetation facilitates the
transport of oxygen to the soil and enhances soil microbial communities which enhance biological transformation of
pollutants.
Plants with extensive fibrous or a spreading, rhizomatous root system able to withstand periods of inundation are
preferred in bioretention systems.
A sandy loam filtration media with a hydraulic conductivity of 200mm/hr will ensure that filtration media does not
become waterlogged (Australian Runoff Quality (ARQ),2004, Section 9.4). The ARQ states that bioretention systems
are efficient in treating, TSS, TN, TP and Hydrocarbons (where attached to fine sediments). Refer to drawings in
Appendix A for bioretention basin details.
The uPVC slotted pipe will collect the treated Q3 Month flow after it has filtered through a layer of sandy loam. The
treated runoff water in the slotted pipe will connect into the side of the field inlet. The treated flow will be piped from
the field inlet together with the collected minor flow via the sites stormwater drainage network. The MUSIC
parameters used for the Bioretention Basins are shown on Table 5.
Table 5: Bioretention Basin MUSIC Parameters
Parameter Value
Extended detention depth 0.30 m
Seepage Loss (mrnlhr) o mm/hr
Filter Depth (m) 0.5 m
Particle Diameter (mm) 0.45 mm
Saturated Hydraulic Conductivity (mm/hr) 200 mm/hr
Depth below underdrain pipe (%of Filter Depth) 0%
Lining Properties: Is basin lined Yes
Vegetation Properties Vegetated with effective nutrient
removal plants
Surface Area -
Basin A 16 m2
Filter Area - Basin A 16 m2
pagel11
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
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4.6 Treatment Train effectiveness in Pollution Reduction
The MUSIC Model was run calculating the effectiveness in pollution reduction based on treatment being undertaken
by the Bioretention Basins. Table 6 shows the post treatment concentrations compared to the Queensland Water
Quality Guidelines.
Table 6: MUSIC Output Results
Pre Treatment Post Treatment Water Quality Reduction in
Pollutant
Load Load Pollutant
Objectives
TSS 998 kg/yr 181 kg/yr 80% 81.9 %
TP 1.74 kg/yr 0.584 kg/yr 60% 66.4%
TN 8.11 kg/yr 4.07 kg/yr 45% 49.8%
GP 59.0 kg/yr 0.00 kg/yr 90% 100 %
(Referto Appendix C for Treatment Train Effectiveness)
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5. Maintenance
The following maintenance protocols detailed in Section 5 have been adapted from the Healthy Waterways Water
Sensitive Urban Technical Design Engineering Guidelines for South East Queensland -
Version 1 June 2006. They
should generally be adopted as standard maintenance procedures upon the installation and or construction of
Bioretention Basins.
5.1 Bioretention Basins
Bioretention Basins require ongoing maintenance to ensure water treatment efficiencies are maintained. Attached in
Appendix D is a Bioretention Checklist.
Vegetation plays a key role in maintaining the porosity of the filter media of a bioretention basin and a strong healthy
growth of vegetation is critical to its performance. Therefore the most intensive period of maintenance is during the
plant establishment period (first two years).
Inflow systems and overflow pits require careful monitoring, as these can be prone to scour and litter build up. Debris
can block inlets or outlets and can be unsightly, particularly in high visibility areas. Inspection and removal of debris
should be done regularly, and debris should be removed whenever it is observed on a site. Where sediment forebays
are adopted, regular inspection of the forebay is required (3monthly) with removal of accumulated sediment
undertaken as required.
For larger bioretention basins, it is essential that a maintenance access point is designed for and maintained in the
bioretention basin. The size and complexity of the system will guide its design and may involve provision of a
reinforced concrete ramp/ pad for truck or machinery access.
Typical maintenance of bioretention basin elements will involve:
. Routine inspection of the bioretention basin profile to identify any areas of obvious increased sediment
deposition, scouring from storm flows, rill erosion of the batters from lateral inflows, damage to the profile
from vehicles and clogging of the bioretention basin (evident by a ’boggy’filter media surface).
. Routine inspection of inflows systems, overflow pits and under-drains to identify and clean any areas of
scour, litter build up and blockages.
. Removal of sediment where it is smothering the bioretention basin vegetation.
. Where a sediment forebay is adopted, removal of accumulated sediment.
.
Repairing any damage to the profile resulting from scour, rill erosion or vehicle damage by replacement of
appropriate fill (to match onsite soils) and revegetating.
.
Tilling of the bioretention basin surface, or removal of the surface layer, if there is evidence of clogging.
.
Regular watering/ irrigation of vegetation until plants are established and actively growing.
. Removal and management of invasive weeds (herbicides should not be used).
. Removal of plants that have died and replacement with plants of equivalent size and species as detailed in
the plant schedule.
.
Pruning to remove dead or diseased vegetation material and to stimulate growth.
.
Vegetation pest monitoring and control.
Resetting (i.e. complete reconstruction) of the bioretention basin will be required if the system fails to drain
adequately after tilling of the surface. Maintenance should only occur after a reasonably rain free period when the soil
in the bioretention system is dry. Inspections are also recommended following large storm events to check for scour
and other damage.
P age 113
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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All maintenance activities must be specified in an approved Maintenance Plan (and associated maintenance
inspection forms)to be documented and submitted to Council as part of the Development Approval process.
Maintenance personnel and asset managers will use this Plan to ensure the bioretention basins continue to function
as designed. An example operation and maintenance inspection form is included in the checking tools provided in
Appendix D. These forms must be developed on a site-specific basis as the nature and configuration of bioretention
basins varies significantly.
P age 114
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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6. Conclusion
The MUSIC modelling results in Section 4.6 indicate that Swales, Rainwater Tanks and Bioretention Basins will
adequately treat the identified pollutants associated with the Q3 Month stormwater runoff.
The required bioretention basins are:
Basin Filter Area Surface Area Filter Depth
A 16 m2 16m2 O.5m
A 100mm uPVC slotted pipe will be located O.8m below the surface of the filter material and will
carry the Q3 Month
stormwater runoff to the outlet drain, as per drawing 13-024-C41.
In addition, adherence to the maintenance measures detailed in Section 5 will ensure the ongoing effectiveness and
longevity of the proposed SQID’s.
Based on the above MUSIC results, 13 Consulting considers that proposed treatment of identified pollutants with
Bioretention Basins will satisfy Sunshine Coast Regional Council’s requirements for stormwater quality treatment for
the proposed development.
P age 115
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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7. Reference List
Healthy Waterways, Water Sensitive Urban Technical Design Guidelines for South East Queensland -
Version 1,
June 2006.
Water by Design, MUSIC Modelling Guidelines
Version 1.0, 2010
DERM, Queensland Water Quality Guidelines, 2009
P age 116
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Toowong QlD 4066 www.icubed.com.au F: 07 3870 8988
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Appendix A -
Drawings
Table 7: Drawings prepared by i3 consulting pty Itd
Drawing Number Drawing Description
13-024-C31 Stormwater Plan
13-024-C32 Stormwater Details
13-024-C33 Stormwater Quality Details
13-024-C34 Catchment Plan
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Appendix B -
Calculations
Table 8: Discharge Calculation Table
Catchment
Major Storm Event QIOO Minor Storm Event Q20 Treatable Storm Event Q3month
Area
Intensity Discharge Intensity Discharge Intensity Discharge
CatchmentE 0.1743ha 315mm/hr 0.153m3/s 247mm/hr 0.111m3/s 63 mm/hr 0.021 m3/s
Sample Calculations
MINOR STORM EVENT 0100
AREA 0.1743 ha
RAINFALL INTENSITY
1,00 315mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C’OO 1.0
DISCHARGE
Q100 CIA 0.153 m’/s
360
MINOR STORM EVENT 020
AREA 0.1743 ha
RAINFALL INTENSITY
1,0 247mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C’" 0.92
DISCHARGE
Q" CIA 0.111 m’/s
360
TREA TABLE STORM EVENT 03month
AREA 0.1743 ha
RAINFALL INTENSITY
!,month 63mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C’month 0.7
DISCHARGE
Q’month CIA 0.021 m’/s
360
P age 118
Level 2, 39 Sherwood Road [email protected] P: 0738708888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
Page 21
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Appendix C -
Music Output
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flow (Ml/Vii) ,
2.55 2.51 1.5
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Peak Flow (m3Is) ~
85.3E-3 98.6E-3 -15.6
Total Suspended SorKis (kg’/vr) 993 181 81.9
Total Phosphorus (kg/yr) 1.74 0.584 ~t:
66.4
Total Nitrogen [kg/Vii) 8.11 4.07 49.8
Gross Pollutants (kg/yr) 59.0 0.00 100.0
I~~I
P age 119
Level 2, 39 Sherwood Road [email protected] P: 0738708888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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Appendix D -Checklists
P age 120
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4.3 Inspection and maintenance checklist for bioretention systems
lA;.;ETTYPE Bloretention ASSET 10
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Location
Date
.
Date of last rainfall Weather
Officers name
Bioretention plan
Insert diagram or plan of the asset showing key features e.g. locations of inlet, outlet, and overflow
Flonallnformation : J
Time taken to complete inspection or maintenance
Photos or site 1.
(explanatory notes) 2.
3.
4.
5.
6.
General comments and sketches
Officer’s signature
P age 121
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Page 24
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l What to look ;;’r Performance Indicator (PI) Condition rating. Maintenance undertaken.. Additional work needed
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INLET = .= ::: ::-==:.: =J
Erosion Inlet is structurally sound and
there is no evidence of erosion or
subsidence/settlement
Damaged or removed structures No damage that poses a risk to
e.g. pit lids or grates public safety or structural
integrity
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Sediment Coarse sediment forebay <75%
full and no litter
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Additional maintenance needed; 4 Rectification may be needed; NI
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not applicable
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Crust of fine sediment No surface crusting
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> 100 mm
Hydraulic conductivity or Filter media is draining freely,
permeability whereby water is not ponded on
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the surface for more than 12 hours
after rainfall and there is no
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end caps securely in place
III III
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Litter Maximum 1 piece litter
per 4m’
Unusual odours, colours, or None detetcted
substances (e.g.oil and grease)
Vegetation Minimum 95% vegetation cover
(minimal bare batches)
Plants healthy and free from
g" :~.
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disease
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Stormwater Management Plan
LOT 94 RUFOUS STREET, PEREGIAN BEACH
within
SUNSHINE COAST REGIONAL COUNCIL
for
Multispan Australia Pty Ltd
Project 13-024
icubed consulting
i) innovation ingenuity inspiration
ABN 89 106 675 156
Level 2, 39 Sherwood Road
q 298 Toowong, Old 4066
i Bs [email protected]
www.icubed.com.au
P +61 7 3870 8888
F +61 7 3870 8988
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Page 27
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Prepared By Travis Smith
Released By Nick Canto
Date 15 March 2013
Job Number 13-024
Document Name 13-024 SWMP
Version 1.0.
Approved for release by:
Nick Canto
RPEQ 6750
15 March 2013
STATEMENT OF LIMITATION
Data and conclusions of this report are the findings and opinions of icubed
consulting and are not an expressed or implied representation, warranty or
guarantee. This report has been prepared for Multispan Australia.
Level 2, 39 Sherwood Road [email protected] P: 073870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
Page 28
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TABLE OF CONTENTS
1. Introduction .....................................................................................................................................................
5
1.1 Background.................................................................................................................................................5
1.2 Objectives ...................................................................................................................................................5
1.3 Scope..........................................................................................................................................................5
2. Location .............................................................................
.............................................................................
6
3. Site Hydrology.................................................................................................................................. ..............
7
3.1 Method and Approach.................................................................................................................................7
4. Water Quantity................................................................................................................................................8
4.1 Predevelopment Flows................................................................................................................................8
4.2 Detention Storage.......................................................................................................................................8
5. Water Quality.............................................................................................................................. 11
..................
5. 1 Construction Phase...................................................................................................................................11
5.2 Operational Phase ....................................................................................................................................12
5.3 Selection of Storm water Management Options .....................................................................
....................12
5.4 Catchment Annual Pollutant Loads...........................................................................................................13
5.5 Selection of Storm water Treatment Options.............................................................................................13
5.5.1 Enviropods .................................................................................................
...........................................
....14
5.5.2 Stormfilter System.....................................................................................................................................14
5.5.3 Rainwater Tanks .......................................................................................................................................14
5.6 Treatment Train effectiveness in Pollution Reduction ................................................................
...............15
6. Maintenance. .............................................................................................
...................................................
16
6.1 Enviropods ........................................................................
....................................................
....................16
6.2 Stormfilter System ......................................................................................................................
...............16
6.3 Rainwater Tanks .......................................................................................................................................16
7. Conclusion.............................................................................................................................. ......................
17
8. Reference List........................................................................................................................................ .......
18
Appendix A Drawings.......................................................................................................................................
-
19 ........
Appendix B Calculations.................................................................................................................................
-
20 .........
Appendix C Music Output........................................................................................................................................ 21
-
Appendix 0 Drains Output.............................................................................................................
-
22
..........................
Appendix E Stormwater360
-
StormFilter/ Enviropod Operations an Maintenance ......................................-............ 24
Page 13
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
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LIST OF FIGURES
Figure 1: Locality Plan, (2013,Copyright Google Maps) Not to scale, generally indicative only.
-
...........................
6
Figure 2: Aerial Photo, (2013,Copyright Google Earth) -
Not to scale, generally indicative only............................. 6
Figure 3: Volume vs Elevation for Basin 1 ..................................................................................................................8
Figure 4: Volume vs Elevation for Basin 2 .......................................................................
...........................................
9
LIST OF TABLES
Table 1: Catchment and Flow ......................................................................................................................................
7
Table 2: Detention Basin 1 Flow M itigation Table...................................................................................................... 10
Table 3: Detention Basin 2 Flow Mitigation Table ............................................................
..........................................
10
Table 4: Stormwater Quality Objectives for the Site. (Operational Stage) .................................................................
12
Table 5: MUSIC Model Parameter Summary.............................................................................................................13
Table 6: Annual Pollutant Loads ................................................................................................................................
13
Table 7: MUSIC Output Results.................................................................................................................................15
Table 8: Drawings prepared by i3 consulting pty Itd ........................................................
............................................
19
Table 9: Discharge Calculation Table ........................................................................................................................ 20
Page 14
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
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1. Introduction
1.1 Background
i3 consulting was commissioned by Multispan Australia to undertake the stormwater quantity and quality
documentation required for the development approval application for the proposed development at Lot 94 Rufous
Street, Peregian Beach. This report covers the stormwater quantity and quality for the development approval. The
proposed development is shown on drawing 13-024-C31 in Appendix A.
1.2 Objectives
This report has been compiled to address the stormwater quality and quantity requirements of the Water Sensitive
Urban Design Guidelines for South East Queensland, the Environmental Protection Act 1994 and the Environmental
Protection (Water)Policy 1997.
1.3 Scope
The scope of this report encompasses in detail the post construction phase of development; however the
construction phase is briefly addressed.
PagelS
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
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2. Location
The proposed development is located on Lot 94 on SP137431. The street address is defined as 5-7 Rufous
Street,
Peregian Beach. The eastern boundary fronts an existing carpark for the Community House and the western fronts
on to Rufous Street. The northern boundary fronts a Telstra
exchange building and the southern boundary fronts an
access easement and tennis centre.
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Sour : Google Maps
Page 16
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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3. Site Hydrology
3.1 Method and Approach
The stormwater discharges from this site were calculated using the rational method. This method as described in the
Queensland Urban Drainage Manual (QUDM)is commonly used in municipal hydrology and is more than adequate
for the design requirements. The Rational Method is based around the Rational formula:
Q=-
C/lyA
y
360
Where: Oy = Peak flow rate (m3/s)for the average recurrence interval (ARI)of y years
Cy = Coefficient of runoff for ARI of y years
A = Area of catchment (ha)
t
I =
Average rainfall intensity (mmlhr)for design duration of t hours and
y
an ARI of y years.
When designing the stormwater drainage system the following points have been considered:
Stormwater treatment shall be designed for a 3 month storm event, calculated as Q1 x 0.5; and Stormwater
reticulation is to cater for Q3 month ,Q20 and Q100 storm events.
For the purposes of this stormwater quality assessment, the area of the proposed development requiring stormwater
quality treatment has been divided up into 4 catchments:
Table 1 details catchment names, areas and storm event flows for each of the 4 catchments based on the Rational
Formula. Refer to Appendix B for details of catchment calculations and Appendix A, drawing 13-024-C34, for
catchment areas.
Table 1: Catchment and Flow
Catchment Catchment Area Q100 Major Flow Q20 Minor Flow Q3 month Treatable Flow
Catchment A 0.3494 ha 0.306 m3/s 0.221 m3/s 0.043 m3/s
Catchment B 0.1023 ha 0.090 m3/s 0.065 m3/s 0.013 m3/s
Catchment C 0.1893 ha 0.166 m3/s 0.119 m3/s 0.023 m3/s
Catchment D 0.0094 ha 0.008 m3/s 0.006 m3/s 0.001 m3/s
Pagel7
level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QlD 4066 www.icubed.com.au F: 07 3870 8988
Page 33
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4. Water Quantity
4.1 Predeve/opment Flows
The predevelopment runoff from the site was calculated using the ILSAX method within Watercom Drains. The runoff
was calculated at the outlets at the north western and south western corners of the site and has been summarized in
Table 2 and 3.
4.2 Detention Storage
The detention storage was calculated for Basin 1 and Basin 2 within Watercom DRAINS. The inflow and outflow
hydrographs are shown in Appendix D. The hydrographs clearly show that the runoff entering the system has been
greatly reduced so that in conjunction with the remaining unmitigated flow there is less than the existing amount of
runoff entering the downstream system. The 15 minute duration storm was found to be the worst case scenario.
The hydrographs are for the storms:
Major events:
AR&R 100 year, 15 minutes storm, Zone 3
AR&R 50 year, 15 minutes storm, Zone 3
Minor events:
AR&R 10 year, 15 minutes storm, Zone 3
AR&R 2 year, 15 minutes storm, Zone 3
AR&R 1 year, 15 minutes storm, Zone 3
Designed Basin size:
Basin 1 will be an approximately 9.4m long x 6.0m wide x 1.5m deep. The maximum volume will be approximately
85m3.
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Elevation (m)
Figure 3: Volume vs Elevation for Basin 1
Page 18
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Basin 2 will be an approximately 11.2m long x 6.0m wide x 1.5m deep. The maximum volume will be approximately
100m3.
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Elevation (m)
Figure 4: Volume vs Elevation for Basin 2
Pagel9
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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Based on the outputs from DRAINS for Pre development, Post development and Mitigated Flow, the basin are shown
to adequately mitigate post development flows at the site outlet for all cases.
Table 2: Detention Basin 1 Flow Mitigation Table
Event Frequency (years) Predevelopment Flows Post Development Flows Mitigated Flows
(DRAINS) (DRAINS) (DRAINS)
1 0.031 m3/s 0.081 m3/s 0.030 m3/s
2 0.050 m3/s 0.104 m3/s 0.036 m3/s
10 0.082 m3/s 0.144 m3/s 0.046 m3/s
50 0.120 m3/s 0.187 m3/s 0.091 m3/s
100 0.136 m3/s 0.207 m3/s 0.136 m3/s
Inflow/Outflow and Storage data for worst case durations for each event modeled have been included in Appendix D.
Table 3: Detention Basin 2 Flow Mitigation Table
Event Frequency (years) Predevelopment Flows Post Development Flows Mitigated Flows
(DRAINS) (DRAINS) (DRAINS)
1 0.036 m3/s 0.093 m3/s 0.036 m3/s
2 0.058 m3/s 0.120 m3/s 0.044 m3/s
10 0.095 m3/s 0.167 m3/s 0.055 m3/s
50 0.139 m3/s 0.217 m3/s 0.097 m3/s
100 0.158 m3/s 0.240 m3/s 0.154 m3/s
Inflow/Outflow and Storage data for worst case durations for each event modeled have been included in Appendix D.
P age 110
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5. Water Quality
5.1 Construction Phase
Potential exists during the construction phase for sediment to become mobilised by stormwater as suspended solids
from the erosion of exposed soil areas and stockpiles, and as a result of spillages from construction and plant
operations.
Stormwater quality during the construction phase of the development should be addressed in an Erosion and
Sediment Control Plan. The plan should address construction phase erosion and sediment control issues in
accordance with the Institute of Engineers Australia (Qld)Erosion and Sediment Control Guidelines. The Erosion and
Sediment Control Plan should also be in accordance with the Water Sensitive Urban Design Guidelines for South
East Queensland.
The following measures should generally be implemented prior to the commencement of construction:
Education of all site workers in sediment and erosion procedures;
Specified storage areas for construction materials and plant that are bunded to prevent any spillages from
escaping; and
Construction of silt fences and catch drains adjacent to the downstream boundaries to divert runoff to temporary
sediment basins.
The following measures should be implemented during the construction phase of the project:
Temporary sedimentation basins should be constructed in accordance with Council’s requirements;
Silt fences should be erected downstream of all disturbed areas; and
All erosion and sediment control devices should be regularly inspected and maintained following storm events.
Pagel11
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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5.2 Operational Phase
During the operational stage of the development, the following impacts have been identified in relation to stormwater
runoff and water quality of the receiving waterways:
. Potential exists for gross pollutants which include human derived litter, course sediment and vegetation affecting
the drainage capacity of stormwater systems. Gross pollutants are also typically unsightly reducing the visual
amenity of the site. Gross pollutants can also physically affect the downstream waterway habitats and
organisms such as entangling birds and marine animals in plastic;
Sediment and Suspended Solids can become mobilised by stormwater as suspended solids from the erosion of
exposed soil areas, un-mulched garden beds and sediment deposited on car park and hardstand areas by
vehicles and by atmospheric deposition of sediment. Sediment can affect receiving waterways physically
through smothering aquatic flora and fauna. Sediments can also block stormwater systems leading to local
flooding. Suspended solids may also be used as a transport medium for nutrients and heavy metals making
their way into waterways; and
Nutrients can enter the waterways from stormwater runoff through many sources including, detergents used in
carwashing, fertilizers from landscaping and lawn areas, nitrous oxide deposition from vehicle exhausts, and
organic waste. Large nutrient levels can lead to eutrophication of the receiving waterways resulting in algal
blooms and excessive macrophyte growth.
Implementation of the appropriate SQID’s would ensure that stormwater leaving the developed site shall be
acceptable to Healthy Waterways, Water Sensitive Urban Design Guidelines for South East Queensland’s
requirements.
5.3 Selection of Stormwater Management Options
The Performance Criteria required to be met for discharges from development sites during the ’operational’ (post-
construction) phase of the development is detailed in Table 2.2 of the Urban Stormwater Quality Planning Guidelines
2010.
The load-reduction targets that must be achieved when assessing the post-developed sites treatment train,
(comparison of unmitigated developed case versus developed mitigated case) are listed in Table 4.
Table 4: Stormwater Quality Objectives for the Site. (Operational Stage)
Pollutant Issues Load Reduction Objectives (%)
Total Suspended Solids 80
Total Phosphorus 60
Total Nitrogen 45
Total Gross Pollutants 90
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5.4 Catchment Annual Pollutant Loads
An assessment of stormwater quality was undertaken for the developed unmitigated site. The discharge
concentrations of key pollutants from the site were then compared to the WOO’s. The pollutant concentrations were
obtained by running a MUSIC model with the model parameters sourced from Water by Design Music Modelling
Guidelines (Version 1.0 2010). MUSIC is the Model for Urban Stormwater Improvement Conceptualisation,
developed by the MUSIC Development Team of the CRC for Catchment Hydrology.
MUSIC has the ability to simulate quality of runoff from catchments ranging from a single house block up to many
square kilometres, and the effect of a wide range of treatment facilities on the quality of runoff downstream. By
simulating the performance of stormwater quality improvement measures, MUSIC determines if proposed systems
can meet specified water quality objectives.
Table 5 details the MUSIC parameters utilised in running the model.
Table 5: MUSIC Model Parameter Summary
Meteorological Data 40059 COOROY
1973-1983 6 minute BOM
Source Node Commercial
Effective Impervious Area Varies
Effective Pervious Area Varies
Modelling Time Steps 6 Minute
Drainage Link No Routing
Pollutant Concentration Industrial
Soil Properties Industrial
Treatment Devices Stormwater360 Enviopod
Stormwater360 Stormfilter System
Rainwater Tank
MUSIC calculated the following annual pollutant loads for the 4 combined catchments:
Table 6: Annual Pollutant Loads
Pollutant Annual Load
Total Suspended Solids 2700 kg/yr
Total Phosphorus 5.00 kg/yr
Total Nitrogen 30.2 kg/yr
Total Gross Pollutants 217 kg/yr
5.5 Selection of Stormwater Treatment Options
Based on the understanding of Sunshine Coast Regional Council’s requirements for stormwater quality treatment for
industrial sites Enviropods, a Stormfilter System and rainwater tanks have been utilised as the SOlD’s for this site.
P age 113
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5.5.1 Enviropods
The EnviroPod is a gully pit insert designed to be easily retrofitted into new and existing stormwater gullypits. It
removes a significant portion of sediment, trash, debris and other pollutants from water entering the stormwater
system, and can be installed in either kerb inlet, standard pre-cast gully pits or manhole gully pits. The EnviroPod can
be customised to meet site-specific requirements with interchangeable monofilament mesh screens ranging from 200
t01600 micron pore size.
The EnviroPod consists of a screening bag supported by a fillterbox and structural cage. Modular plastic deflector
panels attach to the filterbox and guide the flow of water to the screening bag. The screening bag captures pollutants
and allows the water to pass through to the outlet pipe. Openings in the filterbox allow water to bypass the screening
bag during high flow conditions to prevent surface flooding.
The use of EnviroPods as part of the treatment train prior to the Stormfilter will decrease the required maintenance
for the Stormfilter system.
5.5.2 Stormfilter System
StormFilter is a passive, flow-through stormwater filtration system. It consists of vaults that house rechargeable
cartridges filled with a variety of filter media. The filter systems are installed in-line with storm drains. The StormFilter
works by passing stormwater through media-filled cartridges, which trap particulates and adsorb materials such as
dissolved metals and hydrocarbons. After being filtered through the media, the treated stormwater flows into a
collection pipe or discharges into an open channel drainage way.
The StormFilter is a passive stormwater filtration system designed to improve the quality of stormwater runoff from
the urban environment before it enters receiving waterways.
Through independent third party studies, it has been demonstrated that the StormFilter is highly effective for
treatment of first flush flows and flow-paced flows during the latter part of a storm. In general, Storm Filter’s efficiency
is highest when pollutant concentrations are highest. The primary target pollutants for removal are: sediments (TSS),
soluble metals, soluble phosphorus, nitrates, and oil and grease.
The StormFilter is designed to siphon stormwater runoff through a filter cartridge containing media. The variety of
media available can be designed to act as a mechanical filter to remove sediments, as an ion exchanger to remove
dissolved heavy metals, and as an absorber to remove oils and greases.
5.5.3 Rainwater Tanks
Rainwater tanks will be used on the site to both provide water for reuse and improve the quality of the stormwater
runoff.
Rainwater tanks assist in the removal of stormwater pollutants such as coarse sediments through the reuse of water
for toilet flushing, irrigation and cleaning.
The rainwater tank will consist of a 12kL underground tank for clean water (roof runoff) for each site. Overflow from
the tank will be discharged to the underground drainage system which discharges in the Stormfilter system.
P age 114
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5.6 Treatment Train effectiveness in Pollution Reduction
The MUSIC Model was run calculating the effectiveness in pollution reduction based on treatment being undertaken
by Enviropods, a Stormfilter System and a rainwater tank. Table 7 shows the post treatment concentrations
compared to the Water Quality Objectives.
Table 7: MUSIC Output Results
Pre Treatment Post Treatment Reduction in
Pollutant WQO
Load Load Pollutant
TSS 2700 kg/yr 227 kg/yr 80% 91.6%
TP 5.03 kg/yr 1.53 kg/yr 60% 69.5%
TN 30.0 kg/yr 16.5 kg/yr 45% 45.2%
GP 217 kg/yr 0.00 kg/yr 90% 100.0%
(Refer to Appendix C for Treatment Train Effectiveness)
The MUSIC treatment measures and assumptions adopted for this development include:
Roofwater to be directed to a 12kL tanks, 1.2kL reuse/ day
Roof catchments with a fraction impervious of 100%
8 x Enviropods at 20Lls each
17 x Stormfilter Cartridges at 1.1 LIs each
P age 115
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6. Maintenance
The following maintenance protocols detailed in Section 6 have been adapted from Maintenance manuals supplied
by the manufactures. They should generally be adopted as standard maintenance procedures upon construction of
EnviroPods, Stormfilters and Rainwater Tanks.
6.1 Enviropods
Maintenance is to be carried out as outlined in the Stormwater360 Stormfilter/ Enviropod SFEP Treatment Train
Operations and Maintenance. Refer Appendix E
6.2 Stormfilter System
Maintenance is to be carried out as outlined in the Stormwater360 Stormfilter/ Enviropod SFEP Treatment Train
Operations and Maintenance. Refer Appendix E
6.3 Rainwater Tanks
Proper maintenance of the tank, catchment system, roof, gutters and inlet is essential to ensure a safe supply of
water and is best carried out before seasons when heavy rain is expected. Roof catchments and gutters should be
inspected and cleared of leaves and other debris every three or four months. Overhanging branches should also be
removed where possible. If overhead wires are too close for safety, contact your local power authority for advice. All
screens should be cleaned regularly. Tanks should not be allowed to become breeding sites for mosquitoes. If
mosquitoes are detected in a tank the entry point should be located and closed.
Desludging: Tanks should be examined for accumulation of sludge at lease every 2-3 years. If sludge is present in
the tank it should be removed by siphon or by complete emptying of the tank (desludging).Tanks with a ’cone scour’
base are easy to clean by simply opening the cleaning outlet to allow the water to gush out with the sludge then
rinsed with a hose. Small, flat bottomed tanks can be drained, rinsed with a hose and titled to drain. One method of
cleaning big flat-bottomed tanks is to get inside with a bucket, shovel and broom and dig out the sludge. A second
person should be present to ensure the safety of the person inside the tank. Clean a big tank early in the morning or
when the area is shaded to avoid heat exhaustion. For light inside the tank, use a battery lantern not a flame or
electric extension. If chemicals are being used for repairs inside, a respirator may be necessary. Professional tank
cleaners are available in some areas. A concrete tank could crack if it dries out. Check with the tank supplier to find
out if the type you have can safely remain empty for a few weeks. It might be necessary to put water in the tank to
stop it from cracking. Plastic tanks will need some water or should be tied down to stop them from blowing over in
strong winds when they are emptied. If the tank is your only source of water, it can still be desludged regularly by
siphoning the sludge off. If the sediment has been stirred up, the water can be treated chemically with chlorine and/
or boiled before consumption.
P age 116
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 0738708988
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7. Conclusion
The DRAINS modelling indicates that the two detention basins at 85m3 and 100m3 will
adequately mitigate the site
runoff to predevelopment flows.
The MUSIC modelling results in Section 5.6 indicate that Enviropods, a Stormfilter
System and a Rainwater tank will
adequately treat the identified pollutants associated with the Q3 Month stormwater runoff.
The required amount of Enviorpods is:
8 x Enviropods Series 200 Filters
The required size of the Stormfilter System includes:
17 x 460mm cartridges within the precast Stormfilter System
In addition, adherence to the maintenance measures detailed in Section 6 will ensure the
ongoing effectiveness and
longevity of the proposed SQID’s.
Based on the above DRAINS and MUSIC results, 13 Consulting considers that proposed treatment of identified
pollutants with Enviropods, a Stormfilter System and a Rainwater tank and mitigation of flows will satisfy Sunshine
Coast Regional Council’s requirements for stormwater quantity and quality treatment for the
proposed development.
Pagell1
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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8. Reference List
Healthy Waterways, Water Sensitive Urban Technical Design Guidelines for South East Queensland -
Version 1,
June 2006.
Water by Design, MUSIC Modelling Guidelines
Version 1.0, 2010
DERM, Queensland Water Quality Guidelines, 2009
Watercom Pty Ltd, DRAINS User Manual, November 2007
Stormwater360 Australia, StormFilter/ EnviroPod SFEP Treatment Train Operations and Maintenance, 2011
Pagel1B
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
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Appendix A -
Drawings
Table 8: Drawings prepared by i3 consulting pty Itd
Drawing Number Drawing Description
13-024-C31 Stormwater Plan
13-024-C32 Stormwater Details
13-024-C33 Storm water Quality Details
13-024-C34 Catchment Plan
P age 119
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Appendix B -
Calculations
Table 9: Discharge Calculation Table
Catchment Area
Maior Storm Event Q100 Minor Storm Event Q20 Treatable Storm Event Q3 month
Intensit Discharge Intensi! Discharge Intensit Discharge
Catchment A 0.3494 ha 315 mm/hr 0.306 m3/s 247 mmlhr 0.221 m3/s 63 mm/hr 0.043 m3/s
Catchment B 0.1023ha 315 mm/hr 0.090 m3/s 247 mmlhr 0.065 m3/s 63 mm/hr 0.013 m3/s
Catchment C 0.1893 ha 315 mm/hr 0.166 m3/s 247 mmlhr 0.119m3/s 63 mm/hr 0.023 m3/s
Catchment C 0.0094 ha 315 mm/hr 0.008 m3/s 247 mmlhr 0.006 m3/s 63 mm/hr 0.001 m3/s
Sample Calculations
MINOR STORM EVENT Q1(1O
AREA 0.3494ha
RAINFALL INTENSITY
1,00 315mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
Cm 1.0
DISCHARGE
Q,OD CIA 0.306 m’!s
360
M!NOR STORM EVENT Q,.
AREA = 0.3494ha
RAINFALL INTENSITY
1,0 247mm!hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C20 0.92
DISCHARGE
Q" CIA 0.090 m’!s
360
TREA TABLE STORM EVENT Q 3month
AREA 0.3494ha
RAINFALL INTENSITY
hmooth 63mm!hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C,month 0.7
DISCHARGE
Q’month CIA 0.043 m’!s
360
P age 120
level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
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Appendix C Music Output -
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Flow (ML/yr)
>];, _;ii;
l-
Sources
9’046
Residual Load
9’.12
~~~1 3.6
Peak Flow (m3Is) 0.171 0.345 -101.9
Total SUSJrended sorKfs (kg/yr) 2.70B 227 91.6
Tot l Phosphorus {kg/yrj 5.03 1.53 69.5
Totalltitrogen (kg’/yr) 30..0 16.5 45.2
Gross Pollutants (kg/yr) 217 0.00
.
100.0
I~~II j
Treatment Train Effectiveness
P age 121
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Appendix D - Drains Output
Basin 1 Inflow / Outflow Hydrograph and Storage Graph
Q1
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30
20
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pagel22
Levell, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
[OCR of page images]
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Appendix D - Drains Output
@
Basin 1 Inflow / Outflow Hydrograph and Storage Graph
Qi
0.09
9.08.
907
0.06 {-
0.08
0.03
0.02
9.01
Flow (cu.m/s)
0.04 |
Vs
Volume (cu.m)
D
no
0.12
20 0 60 20
Time (mins)
400) 120
on
0.08
0.08
O08
Flow (cu.m/s)
0.02
Inflow
Volume (cu.m)
20
60 80 7100 120
Time (mins)
Q10
0.16
20 80
Time (mins)
700 720 0
ate |.
at2
a4
0.08
0.05
0.08
0.02
Flow (cu.m/s)
Suton,
=
Volume (cu.m)
Q50
02
2 0 30 80
Time (mins)
40
60 80 7100 720
Time (mins)
100 120 0
018
0.16
016
0.12 |--
o4
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0.08
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Flow (cu.m/s)
8
Jnflow
<a
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Time (mins)
100 420
Flow (cu.mis)
Inflow
ms
80
70
4
Volume (cu.m)
20
10
20 40 60 80
Time (mins)
Level 2, 39 Sherwood Road
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7100 720
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40
60 80 100 120
Time (mins)
40
60 80 400 120
Time (mins)
20
40
60 80 100 120
Time (mins)
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Basin 2 Inflow / Outflow Hydrograph and Storage Graph
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Page 123
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Basin 2 Inflow / Outflow Hydrograph and Storage Graph
Qi
o4 40
Inflow 5
0.08
30
z 0.06 E 2
E z 20
3 0.04 2 5 4
&
BS es 3 ” nN
iz > 5 —— at
<n
0 ° i
60 80 100 120 0 20 0 60 30 100 720
Time {mins} Time (mins)
one 60
0.12 ‘alone 50
ay = 40
= &€
s 008 :
E & 3»
2 00 =
= 008 5 2
a ‘Outow 2
& 0.02 s 10
o °
20 0 60 30 700 120 0 20 0 60 80 100 720
Time (mins) Time (mins)
018 80
016 ro
oss oe
z 012 - a
= on 3 7”
ju &
> 0.08 & *
2 0.04 3 20
9.02 > 10
° °
0 20 40 80 80 700 720 ° 20 0 60 80 100 720
Time (mins) Time (mins)
022 129
a inflow
0.18
016
es on =
E 0.12 3
a 04 £
Ste oo z
= aw 5
é 2
xz 0.08 s
002
° a
° 20 40 60 80 100 720
Time (mins)
03 120
100
= 80
z E
& 3 60
3 &
& £ 40
= =
= Ss
fz $ 2
Sh o
80 80 100 720 20 40 60 30 100 720
Time {mins) Time {mins}
Page [23
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Toowong QLD 4066
[email protected]
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Appendix E Stormwater360 StormFilter/ Enviropod Operations and
-
Maintenance
Page 124
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Page 50
Stormwate r360
AUSTRALIA
StormFilter /EnviroPod
SFEP Treatment Train
Operations and Maintenance
For:
Note: This guideline should be used as a part of the site stormwater management plan and is to be read in
conjunction with the site specific Maintenance Schedule.
(92011Stormwater360
Page 51
Stormwate r360
AUSTRALIA
Client:
Contact: Phone:
Engineer:
Contact: Phone:
Address of Device:
Items: SFEP Treatment Train
I~ I
Frequency of Inspections and Maintenance:
Inspections (time/year) Major Maintenance
En viroPods 2 (and after major storm) 3-4 months
StormFilters 1 (after25mm rain event) 12 months
Maintenance Estimate Annual Cost:
StormFilters;
I
.
Enviropods:
@2011 Stormwater360
Page 52
1. INTRODUCTION
The following report details the recommended methods for
cleaning and maintaining the Enviropod
Stormwater Gully Pit Insert. The aspects associated with cleaning included in this manual are methods for
grate removal, filter bag cleaning, unit inspection, filter bag rejuvenation and the re-insta"ation of the filter
bags. This plan should be used in conjunction with the appropriate traffic management plans and site safety
plans produced for each project. Other Stormwater360 (IES) documents which IES staff should use in
conjunction with this report include the IES Employee Health and Safety Manual. It is recommended that
contractors develop their own health and safety plans for activities to ensure that the workers are
placed in a
safe work environment.
Enviropod filter in service.
Each stormwater treatment device must be inspected and maintained regularly to ensure it is working
properly throughout the estimated design life. During each inspection and clean, details of the mass, volume
and type of material observed should be record to provide ongoing data for future
management plan revisions
and the optimisation of the maintenance frequency. It is essential that maintenance
(including inspections,
recording and reporting) be carried out in a systematic manner and is carried out by qualified and experienced
personnel. It is also advisable that the treatment device owner has a nominated
person responsible for
overseeing the management process.
Maintenance is an essential component of stormwater management enabling ongoing at source control of
stormwater pollution. Maintenance will also prevent failures such as structural failure
(e.g. prevents blocked
outlets) or aesthetic failure (e.g. debris accumulation). A" stormwater treatment devices require maintenance
to ensure the ongoing performance ofthe system.
This document consists primarily of the processes and tasks associated with the hand maintenance and
inductor maintenance procedures. It does not include detail of the traffic management requirements or
occupational health and safety requirements. Contractors or IES staff should utilise their own Employee
Health and Safety Manual, which details the policies and procedures for safe work.
(92011Stormwater360
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2. Health and Safety
Cleaning of Enviropod filters and Stormfilters is a specialist activity. Material collected can be harmful if not
handled correctly. Sediments may contain heavy metals and carcinogenic substances as well as harmful
objects such as broken glass and syringes. It is essential that Occupational Safety and Health guidelines are
followed at all times, and that the following steps are carried out to ensure safe and successful maintenance
operations.
In additional to the hazards associated with the cleaning handling of material in the filter bags, there also
hazards associated with traffic at the work site, the removal of the grate, pedestrians and other non-worker
personnel, and general work place hazards associated with working outdoors.
The procedures indicated in the Operations section of this manual are recommend as the safest and most
efficient manner in conducting the maintenance of Enviropod Units (Section 3), however contractors and
cleaning staff may vary the procedure in response to the site conditions, varying work practices or general
preferences in the cleaning techniques. Please note that procedures outlined in this manual are not
exhaustive, and that any changes should still comply with general safe work practices.
2.1 Personnel Health and Safety
All contractors and staff shall comply with all current Health and Safety Legislation and take all practicable
steps to:
Comply with all applicable laws, regulations and standards.
Ensure that all employees, contractors and visitors are informed of and understand their obligations in
respect of current Health and Safety Legislation.
Ensure that employees understand and accept their responsibility to practice and promote a safe and
healthy work environment.
All relevant precautions must be taken to prevent contact with sediment and litter when maintaining filters.
The following personal protective equipment (PPE)safety equipment should be worn:
Puncture resistant gloves.
Steel capped safety boots.
Fluorescent safety vest.
Overalls or similar skin protection.
Safety apron. (if necessary)*
Eye protection. (if necessary)*
*Higher personal safety conditions may be required when maintaining units that may contain more hazardous
material, for example pits where syringes have be observed or pits located in areas associated with such
activities.
2.2 Traffic Control
All stormwater collection pits are typically situated either in/on roads and car parks or adjacent to roads in the
footpath or swales. Traffic control requirements at each of these locations is typically the same, with most of
the state and local road authorities requiring the same controls implemented whether the work is to be
conducted on the road or on the road reserve.
As traffic requirements vary based on the road usage and the specific road configuration, traffic control plans
should be prepared for each site. Given that maintenance is typically a q_uick process, the contractor should
liaise with the relevant road authority to determine the specific road safety requirements for each location to
ensure that on site workers can conduct the cleaning operations safely and efficiently, while complying with all
laws and regulations.
@2011 Stormwater360
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NSW RTA working on roads safety manual indicates the
signage requirements, placement of barricades or
witches hats and the positioning of traffic control personnel. In addition to standard
safety requirements IES
recommends that the maintenance vehicle be used to increase safety, through shielding the work area from
oncoming traffic.
Plate 1 indicates the vehicle placed to shield the work area with cones placed around the vehicle. Plate 2
indicates at head on view, note the vehicle is positioned to allow access to the drive, whilst still the
blocking pit
from on-coming traffic. The vehicle has a flashing light on the roof and the hazard switched on.
Plate 1 Vehicle positioned near pit, preventing traffic from passing close to the
pit.
Plate 1 Head-on view, indicating the placement of the vehicle near the pit.
(92011Stormwater360
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2.3 Confined Spaces Confined spaces poses a serious safety hazard for all personnel, however during the normal maintenance procedures there should be no reason to enter a confined space. All maintenance procedures are able to be conducted from the surface. Confined space entry procedures are not included as part of this manual, for IES employees confined space entry procedures are included as part of the IES Safety Manual. It is recommend that all contractors evaluate their own needs for confined space entry and compliance with Occupation Health and Safety regulations. When repairs or maintenance activities cannot be conducted from the surface, the contractor/cleaner should evaluate the need to enter the confined space, considering all alternative options. Where there is a need to proceed in a confined space, only staff with current confined space training shall operate in a confined space. Appropriate measures and controls shall be put in place to meet confined space entry requirements. Safety equipment must be worn where deemed necessary and where gas or oxygen hazard occurs, staff trained in its use will only use SA gear. Non-trained staff must not go into confined spaces. (92011Stormwater360
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3. Operations
This section details the specific activities required to clean the Enviropod units. Please note it has been written
for use by someone who has never encountered a stormwater pit or an Enviropod unit,
providing a step by
step process for each of the cleaning stages.
3.1 Maintenance & Monitoring of Enviropod filters
To ensure that the unit performs optimally, the material collected by the filter bag should be
emptied when
the level of material is no more than approximately half to two thirds of the total bag depth or when there is
evidence of material overflow. Although the bag has greater storage area, it is recommended that it is not left
to fill completely prior to empting, for the following reasons; the bags are capable of retaining a
heavy mass of
material (in excess of 50kg); material near the top of the bag can be resuspended during high to extreme
rainfall events; and blockage of the overflow sections can occur, when material is allowed to build
up above
the filter bag.
It is also recommended that additional monitoring should be conducted following moderate to extreme
rainfall events, in particular, when preceding months have had little to no rainfall. This monitoring is
considered necessary to accommodate for higher volumes of runoff generated during major rainfall events, an
anticipated greater accumulation of surface contamination during low rainfall periods and to ensure that the
units have not been damaged due to high pipe velocities.
@2011 Stormwater360
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3.2 Storm water Pit Cover Removal
3.2.1 Hinged Pit Grates
To open a hinged pit grate follow the following steps:
1. Insert the lifting hooks beneath the grate. (Position indicated in Plate
2)
2. Check hinge point is not damaged and debris is not caught in the
hinge
area.
3. Note many cast ,iron hinges are not hinged securely (to enable the removal of the
grate). This may
result in the pit grate not being able to sit in an open position.
Additionally the hinge pins may also be
damaged or corroded, which may allow for the pit grate to fall into pit. Such pit grates can be
removed using the method indicated below for non-hinged grates.
4. Fully open pit grate, ensuring that the grate will stay in the open position without any external forces
applied. Grates which do not remain open without being held should be removed or secured during
cleaning or maintenance activities. Plate 3 and Plate 4 indicate the grate being opened and grate
resting freely in the open position, respectively.
Plate 2 Lifting the grate Plate 3 Opening Grate
Plate 4 Fully open grate Plate 5 Lowing grate
(.
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3.2.2 Non-Hinged Pit Grates
To remove a non-hinged pit grate:
1. Place lifting hooks beneath grate, where possible in the four corners of the grate (Plate 6). Concrete
lids may have Gatic lifting points, a key arrangement or holes in the lid, as such special equipment,
such as Gatic lifters may be required.
2. Position each person either side of the grate. (Plate 7)
3. Lift the grate, ensuring that good heavy lifting posture is used at all times.
4. Place the grate on an angle on the gutter, to allow for the lifting hooks to be removed. (Plate 8)
5. For extremely heavy one piece grates and concrete Gatic covers, insert the lifters in place and slide the
lids back. Note some lids still require two p
~:"
Plate 6 Insert hook near edge of grate Plate 7 Position each lifter either side of the
grate
Plate 8 lift grate and move grate to one side
Plate 9 lift grate above the support frame
Plate 10 Reinstated non hinged grate
@2011 Stormwater360
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3.3 Cleaning Methods
One of the following methods of maintenance should be used for the servicing of these Enviropod Filters:
Hand Maintenance.
3.3.1 Cleaning using Inductor Truck
The following steps indicate a safe and efficient method to clean the Enviropod using an Inductor:
1. Open gully pit. (See Section Error! Reference source not found.)
2. Place the inductor hose over the material collected in the filter bag and switch on the inductor.
3. Using the inductor hose suck all of the sediment, organic leaf material, litter etc., collected in the filter
bag
4. Allow the filter bag to be sucked up into the inductor hose for a few seconds to allow for the filter
mesh pores to be cleaned. Care is to be taken by the operator not to damage the filter, i.e. ensure that
there are no sharp edges on the inductor hose.
5. If material has built up around the overflows, use the inductor hose to clear the accumulated material.
6. Remove filter bag from the pit.
7. Sediment retained in the gully pit grate is to be removed.
8. Back opening channels are to be cleared of any debris to ensure flow is not hindered. Debris can be
collected using the inductor truck.
9. All gully pit waste is to be removed from the pit.
10. Check the Enviropod unit. (See Section 0)
11. Check filter bag. (See Section 0)
12. Reinstate filter bag and gully pit lids.
Plate 11 Cleaning an Enviropod using the inductor method
Gully pit sediments under no circumstances are to be backwashed into the gully pit.
@2011 Stormwater360
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3.3.2 Hand Maintenance
The following steps indicate a safe and efficient method to clean the Enviropod manually by hand:
1. Open gully pit. (See Section Error! Reference source not found.)
2. Place the lifting hooks in the lifting loops of the filter bag. (See Plate 12)
3. For extremely heavy and overfilled bags either use a hydraulic lifting arm to lift the bag, or remove
excess material using a shovel or similar piece of equipment. IES prefers the use of a post hole shovel,
due to the reduced strain on the back when digging and the ability of the shovel to grab material
vertically. (Insert Picture)
4. Lift the bag vertically off the supporting frame, ensuring that no undue pressure is placed on the filter
bag. (See Plate 13)
5. Lift the bag clear of the stormwater pit. (See Plate 14)
6. Position the bag over the truck or other collection vehicle, taking hold of the loops at the base of the
bag. (See Plate 15 and Plate 16)
7. Lift and empty the filter bag by holding the bottom lifting loops only. (See Plate 17)
8. Completely empty the filter bag. (See Plate 18)
9. Brush the filter bag with a stiff brush to remove bound sediment from the filter pores. (See Plate 19)
10. Check the filter bag. (See Section 0)
11. Check the Enviropod unit. (See Section 0)
12. Reinstate filter bag, ensuring bag is installed the correct way. (See Plate 20 and Plate 21)
13. Reinstate gully pit lids. (See Plate 22 and Plate 23)
@2011 Stormwater360
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Plate 12 Place the lifting hooks through the Plate 13 Lift the bag from the cage and
bag loops support frame
Plate 14 Lift the bag from the stormwater Plate 15 Lift the bag onto the collection
pit vehicle
Plate 16 Grab the bottom lifting loops Plate 17 Lifting the bottom bag loops empty
the filter bag
@2011 Stormwater360
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Plate 18 Completely empty the contents of Plate 19 Brush the pores filter bag with a
the filter bag stiff brush
Plate 20 Reinstall filter bag Plate 21 Ensure that the unit is positioned
correctly, with the lifting loops on the inside
Plate 22 Correctly installed filter bag Plate 23 Installed filter bag and sealed pit
3.4 Unit Inspection
After the Enviropod filter bag is removed, emptied and cleaned, the following should be checked to ensure
that the unit has not been damaged:
. All connections and joints should be checked and broken rivets replaced (See Plate 24);
The plastic pit seals should be ir:!_spected for unit movement or damage (See Plate 30);_ and
. The cage should be inspected for damage or movement (See Plate 31).
@2011 Stormwater360
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The overflow diversion channels, and the area between the Enviropod cage and pit wall should also be
inspected for the accumulation of debris. Any observed debris should be removed and disposed of off-site.
Accumulated material within the outlet pipe may need to be flushed.
Note: If the units are not cleaned regularly the mobilisation of material collected in the Enviropod unit
may
occur, as such cleaning of the units in accordance with this management plan is required. As this plan is based
on observations and data collected during the monitoring period, ongoing adjustment of the cleaning
frequency is generally required to improve the overall efficiency in the removal of collected material and
prevent material overflow.
Plate 25 Check join
Plate 24 Check seals are pushed against the
shown above)
pit walls
3.5 Filter Bag Inspection and Rejuvenation
Following the emptying and cleaning of the filter bags, the filter bag should be inspected to evaluate the bag
condition. Given the nature of stormwater the filter bag from some Enviropod units can become considerably
clogged with fine sediment. Filters can also be damaged by various objects in storm water as well as fauna.
Sharp objects such as sticks combined with high velocity water and a large mass in the filter bag can cause
small tears in the filter material. Animals such as rats have also been known to chew through fine mesh filter
bags located in gully pits near takeaway food outlets.
3.5.1 Clogged Filters
Clogged filter bags can be clean using several different methods. If the bag cleaning techniques described in
the general maintenance sections above are not able to clean the filter bags the following options should be
considered:
Using a stiff brush and a bucket of soapy water scrub the filter bag surface.
Remove filter bags from the pit and wash the bags using a high pressure water spray. Care has to be
taken to not transfer the contamination elsewhere. Waste water from the process should be collected
of and disposed of correctly.
Remove the filter bags from the pits and the support rings and wash the bags in an industrial washing
machine.
The final option pres~ted above typIcally results in the bags appearing like new, with no visible stain or pore
clogging within the filter mesh.
<92011 Stormwater360
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Plate 26 Slightly clogged filter bag, indicated Plate 27 A clean used filter bag
by the brown stain on in the centre of the
bag
3.5.2 Damaged Filters
Damaged filters can often be repaired, provided the damage is small. Small tears in the fabric may occur do to
several reasons, however the overall strength & structure of the nylon fabric typically prevents small tears
becoming much larger. Although the bag is unlikely to tear further care must be used when clean torn bags as
not to spill the collected material into the pit.
Small tears maybe repaired by either sewing the tear back together, with additional fabric to increase the
strength of the stitching, or by sewing a patch of the filter material onto the filter bag. The filter bags may
need to be replaced if large tears are present, as the filter bag is no longer able to function as intended.
3.6 Disposal of Material
All gully
pit wastes from the site are to be taken off site and disposed of at a transfer station or similar
approved disposal site. Stormwater Sediments can contain Lead, Copper, Zinc, Mercury, hydrocarbons and
PCBs, which are harmful to both humans and the receiving environment. Appropriate sampling and laboratory
analysis may be required to classify the material as suitable for reuse, or disposal under appropriate local
guidelines.
(92011Stormwater360
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4. Emergency Procedures
4.1 Spill Procedures
In the event of a spill discharging into
any gully pit all sediment is to be extracted and the filter bags are to be
removed and replaced with rejuvenated filter bags. Normal
operation procedures apply to additional cleaning
as a result of spills.
4.2 Blockages
In the unlikely event of surface flooding around a gully
pit fitted with an Enviropod the following steps should
be carried out:
Check Enviropod over flow bypass. The Enviropod filter has been
designed with an overflow mechanism built
into the filter box. If surface flooding still exists check the overflow slots underneath the rubber seal. If
debris
is lodged in the overflow slots these can be easily cleared
by hand or steel rod.
If overflow is clear and surface flooding still exists remove
Enviropod and check outlet pipe for blockages.
Removal of the Enviropod may be difficult if the filter is clogged and the
Enviropod is holding water. If the
filter is clogged, brush the side walls of the filter with a yard broom or similar. This will
dislodge particles
trapped at the interface allowing contained water to flow through the filter.
If the outlet pipe is blocked, it is likely that a gully sucker truck will be
required to unblock it. Debris should be
removed from the Enviropod with the gully sucker truck before removal of the
Enviropod filter.
If a gully sucker truck is not available and the Enviropod needs to be removed
by hand, follow the steps below:
Remove excess debris by hand or brush the side of the filter.
Lift and place filter ring through the filter box and into cage.
Remove Filter box.
Lift cage containing filter bag and ring out ofthe pit.
Unblock outlet pipe.
(92011 Stormwater360
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SECTION 1
1.1 DESCRIPTION
5tormFilter is a passive, flow-through stormwater filtration system. It consists of vaults that house
rechargeable cartridges filled with a variety of filter media. The filter systems are installed in-line with storm
drains. The 5tormFilter works by passing stormwater through media-filled cartridges, which
trap particulates
and adsorb materials such as dissolved metals and hydrocarbons. After being filtered through the media, the
treated stormwater flows into a collection pipe or discharges into an open channel drainage
way. 5tormFilter
is offered in three different configurations:
cast-in-place, precast and linear. The precast and linear models
utilize pre-manufactured vaults. The cast-in-place units are customized for larger flows and
may be either
covered or uncovered underground units.
1.2 OPERATION
1.2.1 Purpose
The 5tormFilter is a passive stormwater filtration system designed to improve the
quality of stormwater runoff
from the urban environment before it enters receiving waterways.
Through independent third party studies, it has been demonstrated that the 5tormFilter is highly effective for
treatment of first flush flows and flow-paced flows during the latter part of a storm. In
general, 5tormFilter’s
efficiency is highest when pollutant concentrations are highest. The primary target pollutants for removal are:
sediments (T55),soluble metals, soluble phosphorus, nitrates, and oil and grease.
1.2.2 Sizing
The 5tormFilter@ is typically sized to treat the peak flow of a water quality design storm as it
passes through
the filter. The peak flow is determined by calculations based on the contributing watershed
hydrology and
using a design storm magnitude. The design storm is usually based on the regulatory requirements set by the
local stormwater management agency. The particular size of a 5tormFilter is determined by the number of
filter cartridges (see Figure 4) required to treat the peak stormwater flow. Each cartridge is designed to treat a
peak flow of 1 Litre/second. For example: a peak design stormwater flow rate of lOLls would require that 10
cartridges be used in the treatment vault.
Because of the highly porous nature of the granular filter media, the flow through a newly installed cartridge is
restricted to ll/s, using a restrict or disc, to ensure adequate pollutant-media contact time.
1.2.3 Basic Function
The 5tormFilter is designed to siphon stormwater runoff through a filter cartridge containing media. The
variety of media available can be designed to act as a mechanical filter to remove sediments, as an ion
exchanger to remove dissolved heavy metals, and as an absorber to remove oils and greases.
@2011 Stormwater360
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UFTlNG TAB
AIR LOa< CAP WITH CHECK VALVE
CENTER ruBE _
.
SCRUBBING REGUlA QR (8) UNFilTERED WATE-R
UNDER.-DRAlN MANIFOLO ’
...:::::--
VAUlT FLOOR
UNDER-RA1N MANIFOLD
CAST INTO VAULT ROOR
Figure 4. Filter Cartridge
1.2.4 Priming System Function
The treated stormwater collects in the centre tube of the cartridge, which is equipped with a self-priming
siphon system. Figure 1 illustrates this system, The key component of the system is the plastic float, The float
consists of a ball located at the base leading up to a larger portion, which provides increased buoyancy,
Initially the ball rests in a seat effectively closing off the port to the drainage manifold,
As a result, the filter fills the centre drainage tube until the water level has risen high enough to purge the air
from the filter cartridges and displaces the float. At a water depth of 22 inches the float pulls loose and allows
the filtered water to drain out through the manifold, This effectively "primes" a siphon within the drainage
tube and greatly increases the potential across the filter. The priming system increases StormFilter’s ability to
be loaded with sediment. A related feature is the cartridge "hood". This hood maintains the siphon effect by
preventing air from being drawn into the cartridge until the external water level drops below the bottom of
the hood.
Cartridges are connected to the manifold with a plastic connector. Since some media used is potentially
buoyant, a threaded connector affixed to the manifold with compression bolts is necessary to ensure the
cartridge isn’t lifted out of place. For the heavier leaf media, a slip connector is used.
StormFilter is also equipped with flow spreaders that trap floating debris and surface films, even during
overflow conditions. Depending on individual site characteristics, some systems are equipped with high
and/or low flow bypasses. High flow bypasses are installed when the calculated peak storm event generates a
flow that overcomes the overflow capacity of the system. This is especially important for precast systems.
Low flow bypasses are sometimes installed to bypass continuous inflows caused by ground water seepage,
which usually do not require treatment. All Storm Filter units are designed with an overflow. The overflow
operates when the inflow rate is greater than the infiltration capacity of the filter media.
@2011 Stormwater360
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1.2.5 Maintenance Overview
The primary purpose of the Storm Filter is to filter out and prevent pollutants from entering our
waterways.
Like any effective filtration system, periodically these pollutants must be removed to restore the Storm Filter to
its full efficiency and effectiveness. Maintenance requirements and frequency are dependent on the
pollutant
load characteristics of each site. To assist the owner with maintenance issues, stormwater360 provides
detailed Operation & Maintenance Guidelines with each unit.
Stormwater360 can provide maintenance services completely, or in part. Available services include tracking of
installed systems, advising the system’s owner of maintenance needs, and notification of the regulatory
agency once the system has been maintained.
Maintenance is usually performed in the dryer periods to rejuvenate the filter media and
prepare the system
for the next rainy period. Maintenance activities can also be
required in the event of a chemical spill or
excessive sediment loading due to site erosion or extreme storms. It is good practice to inspect the
system
after severe storm events.
END OF SECTION 1
@2011 Stormwater360
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SECTION 2
RECOMMENDED MAINTENANCE AND EXPECTED PERFORMANCE
2.1 TYPES OF MAINTENANCE
Presently, procedures have been developed for two levels of maintenance: Inspection/minor maintenance
and major maintenance. Inspection/minor maintenance activities are combined since the minor maintenance
does not require special equipment and typically little or no materials are in need of
disposal.
Inspection/minor maintenance typically involves opening the flow restricting valves (to pre-set levels) and
cleanup of vegetation and debris. Major maintenance typically includes cartridge recharging. Major
maintenance may involve disposal of materials that require consideration of regulatory
guidelines. Depending
on theparticular configuration and equipment used, major maintenance may require an understanding of
unit
OSHA rules. Table 1 summarizes the primary activities associated with Storm Filter maintenance.
Table 1: Storm Filter
Facility Component Maintenance When Maintenance Activity Expected Facility Performance
Requiring Maintenance Activity Is Required After Maintaining
Storm Filter"’ Cartridges and Trash and Debris Removal Floatable objects or other trash is Permanent removal from storm
Containment Structure present in the filter. Remove to avoid system.
hindrance of filtration and eliminate
unsightly debris and trash.
Cartridge Replacement and 1. Media has been contaminated by 1. New media is able to effectively
Sediment Removal high levels of pollutants, such as after a treat stormwater.
spill.
Drainage System Piping Flushing With Water Drainage system is obstructed by debris Outflow is not restricted.
or sediment.
2.2 MAINTENANCE ACTIVITIES
2.2.1 Maintenance Activity Timing
Two scheduled inspections/maintenance activities should take place during the year. During the minor
maintenance activities (routine inspection, debris removal), the type of major maintenance required is
determined and, if required for disposal, samples of the sediments and media are obtained. The next
scheduled date is to perform major maintenance activities (replacement of the filter cartridges and associated
sediment removal). In addition to the scheduled activities, it is important to check the condition of the filter
after major storms to check for damage caused by high flows and to check for high sediment accumulation,
which may be caused by localised erosion in the drainage area. It may be
necessary to adjust maintenance
activity scheduling depending on the actual operating conditions encountered by the system.
@2011 Stormwater360
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2.2.2 Maintenance Activity Frequency The primary factor controlling timing of maintenance for the StormFilter is sedimentation. A properly functioning system will remove solids from water by trapping these particulates within the porous structure of the media. The flow through the system will naturally decrease as more and more solids are trapped. Eventually the flow through a system will be low enough to require replacement of the cartridges. Sediment should be removed from upstream trapping devices on an as needed basis to prevent material from being re- suspended and discharged to the system. Site conditions greatly influence maintenance requirements. Storm Filter units located in areas with erosion or active construction should be inspected and maintained more often than those in fully established areas. The maintenance frequency may be adjusted as additional monitoring information becomes available during the inspection program. Areas that develop known problems should be inspected more frequently than areas that demonstrate no problems, particularly after large storms. Ultimately, inspection and maintenance activities should be scheduled based on the historic records and characteristics of an individual filter. @2011 Stormwater360
Page 71
2.3 MAINTENANCE CREW REQUIREMENTS
Table 4 lists the anticipated crew requirements for maintenance
operations. Removal of water and sediments
during major maintenance activities can be accomplished using either a pump and water truck or a vacuum
truck. All applicable safety (OH & S) and disposal regulations should be followed. A
general description of the
maintenance activities follows.
Table 4: ANTICIPATED CREW REQUIREMENTS
Inspection/Minor Major Maintenance: Major Maintenance:
Maintenance Sediment Removal Cartridge Replacement
Labourer 1 1
Skilled Worker 1 1 1
Vacuum/Water Truck Operator 1 0/1
Total 2* 2* 2/3*
Special Requirements Knowledge of Knowledge of Knowledge of
Proper Storm Filter Disposal Cartridge Removal and
Function Requirements Installation Procedures
*
May require OH & S trained person If/when vault entry occurs.
2.4 MAINTENANCE METHODS
2.4.1 Minor Maintenance/Inspection (Twice A Year)
Minor maintenance typically will involve the steps below, however if it
appears that a spill of some type has
occurred, the local hazard control agency and Stormwater360 should be notified immediately. In the case of a
spill, the worker should abort maintenance activities until the proper guidance has been obtained.
Steps for Minor Maintenance
1. Maintenance to be performed by a skilled worker familiar with StormFilter units.
2. If applicable, set up safety equipment to protect pedestrians from fall hazards
presented by open
doors. Also set up appropriate safety equipment for work near roadways.
3. Inspect the external condition ofthe unit and take notes concerning defects/problems.
4. Open the doors to the vault and allow the system to air out for 5-10 minutes.
5. Without entering the vault, inspect the inside of the u nit, including components.
6. Take notes about the external and internal condition. This includes inspecting pit penetrations,
walls,
lids, ladders & grates etc.
7. Give particular attention to recording the level of sediment build-up on the floor of the vault in the
forebay (or pre-treatment bay), and on top of the internal components. If flow is occurring, note the
level of water and estimate the flow rate per drainage pipe. Record all observations.
8. Remove large loose debris and trash using a pole with a grapple or net on the end.
@2011 Stormwater360
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9. Close and fasten the door, and remove safety equipment.
10. Finally, make notes about the local drainage area relative to ongoing construction, erosion problems,
or high loadings of other materials to the system.
2.4.2 Major Maintenance Inspection (Once a Year)
The primary goal of the major maintenance inspection is to assess the condition of the cartridges relative to
the level of sediment loading. It may be desirable to conduct this inspection during a storm to observe the
relative flow through the filter cartridges. If the submerged cartridges are severely plugged, large amounts of
sediments should be present and very little flow will be discharging from the drainage pipes. It is likely that
the cartridges need to be replaced. Major maintenance inspection will typically involve the steps below.
However, if it appears that a spill of some type has occurred, the local hazard control agency and
Stormwater360 should be notified immediately. In the case of a spill, the worker should abort maintenance
activities until the proper guidance has been obtained.
Steps for Pre-Major Maintenance Inspection
1. Maintenance to be performed by a skilled worker familiar with Storm Filter units.
2. If applicable, set up safety equipment to protect pedestrians from fall hazards presented by open
doors. Also, set up appropriate safety equipment for work near roadways.
3. Inspect the external condition of the unit and take notes concerning defects/problems.
4. Open the doors to the vault and allow the vault to air out for 5-10 minutes.
5. Without entering the vault, give the inside of the unit, including components, a general condition
inspection.
6. Take notes about the external and internal condition.
7. Give particular attention to recording the level of sediment build-up on the floor of the vault, in the
forebay, and on top ofthe internal components.
8. Remove large loose debris and trash using a pole with a grapple or net on the end.
9. Ifthe visit is during a storm, make the flow observations discussed above.
10. Close and fasten the door, and remove safety equipment.
11. Make notes about the local drainage area relative to ongoing construction, erosion problems, or high
loading of other materials to the system.
12. Review the condition reports from the previous minor and major maintenance visits and schedule for
cartridge replacement if needed.
@2011 Stormwater360
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2.4.3 Major Maintenance: Sediment Removal & Cartridge Replacement (&Emergency)
Major maintenance/filter cartridge replacement typically involves the steps below. However, if it appears that
a spill of some type has occurred, the local hazard control agency and Stormwater360 should be notified
immediately. In the case of a spill, the worker should abort maintenance activities until the proper guidance
has been obtained. Depending on the configuration of the particular system, a worker may be required to
enter the vault to perform some tasks. If vault entry is required, OH & S rules for general confined
space entry
must be strictly adhered to. Filter cartridge replacement should occur during
dry weather and it may be
necessary to plug the filter inlet pipe if base flows exist. Standing water present in the vault should be
regarded as polluted and contained during this operation by temporarily capping the manifold connectors.
Steps For Cartridge Replacement Maintenance
1. Depending on the particular unit, one or two utility workers and a hauling truck operator will deliver
the replacement cartridges to the site. Information concerning how to obtain the replacement
cartridges is available from Stormwater360.
2. If applicable, set up safety equipment to protect pedestrians from fall hazards
presented by open
doors. Also, set up appropriate safety equipment for work near roadways.
3. Inspect the external condition of the unit and take notes concerning defects/problems.
4. Open the doors to the vault and allow the system to air out for 5-10 minutes.
5. Without entering the vault, give the inside of the unit, including components, a general condition
inspection.
6. Make notes about the external and internal condition.
7. Give particular attention to recording the level of sediment build-up on the floor of the vault, in the
forebay,and on top ofthe internal components.
8. Remove large loose debris and trash using a pole with a grapple or net on the end.
9. Ensuring safe working procedures are met, off load the replacement cartridges (16-39kgs each) and set
aside.
10. Remove the top cap (threaded), upper seal and float from the cartridge. Repeat procedure for
every
cartridge within StormFilter vault. Place items in a large plastic container to be lifted form the vault.
Note: * Confined space entry may be required on StormFilter systems. In this case, please ensure that
appropriate Confined Space entry training and subsequent certification has been undertaken and
valid, and work procedures are strictly adhered to. If you are unsure, do not enter the vault and
contact Stormwater360 immediately.
11. Using a cordless drill and 8mm hex head, remove the three screws located around the top perimeter
of the cartridge hood. Place screws in the large plastic container and, once full or completed, remove
plastic container form vault.
@2011 Stormwater360
Page 74
12. Move the Vacuum truck near the Storm Filter vault on the down wide side. Be sure that the Vacuum
truck is not too close to the vault so as the fumes will not enter the vault. Make sure that the last
500mm ofthe nozzle is approx. 100-125mm in outside diameter.
13. Feed vacuum nozzle into cartridge bay and start vacuum truck. Remove cartridge hood and place
nozzle directly onto filter media. Completely remove media from each cartridge and repeat process for
every cartridge in vault.
14. Once completed unthread cartridges from vault floor and place hood back on cartridges
15. Using the appropriate lifting cap, attach the cable and remove the cartridge (up to lOkgs. each) from
the vault. Personnel standing under suspended cartridges is strictly prohibited. Care must be used to
avoid damaging the cartridges during removal and installation. The cost of repairing components
damaged during maintenance will be the responsibility of the owner unless maintenance activities are
being performed by Stormwater360 and damage is not related to discharges to the system.
16. Set the used cartridge aside or load onto the hauling truck.
17. Repeat steps 14 to 15 once all cartridges have been removed.
18. Remove deposited sediment from the floor of the vault and, if large amounts are present, from the
forebay. This can be accomplished by using the Vacuum truck
15 Once the sediments are removed, it is necessary to assess the condition of the vault, particularly the
manifold and the connectors. These are short sections of 2-inch schedule 50 PVC, or threaded
schedule 80 PVC that should protrude above the floor of the vault. If required, apply a light coating of
FDA approved silicon grease to the outside of the exposed portion of the connectors. This ensures a
watertight connection between the cartridge and the drainage pipe. Replace any damaged
connectors.
16. Using the boom, crane, or tripod, lower and install the new cartridges (typically 16-17kgs. for perlite
cartridges). Once again, take care not to damage connections.
17. Close and fasten the door, and remove safety equipment.
18. Make notes about the local drainage area relative to ongoing construction, erosion problems, or high
loadings of other materials to the system.
19. Finally, dispose of the residual materials in accordance with applicable regulations. Make
arrangements to return the used cartridges to Stormwater360.
(92011Stormwater360
Page 75
2.4.4 Related Maintenance Activities (Performed on an as-needed basis) StormFilter units are often just one of many components in a more comprehensive stormwater drainage and treatment system. The entire system may include catch basins, detention vaults, sedimentation vaults and manholes, detention/retention ponds, swales, artificial wetlands, and other miscellaneous components. In order for maintenance of the Storm Filter to be successful, it is imperative that all other components be properly maintained. The maintenance/repair of upstream facilities should be carried out prior to StormFilter maintenance activities. In addition to considering upstream facilities, it is also important to correct any problems identified in the drainage area. Drainage area concerns may include: erosion problems, heavy oil and grease loading, and discharges of inappropriate materials. 2.5 TYPICAL EQUIPMENT REQUIRED FOR MAINTENANCE ACTIVITIES Typical equipment required for conducting maintenance is shown in Table 5. Some of the materials listed are suggestions rather than requirements. It should be noted that there is more than one way to accomplish some tasks. Owners with available labour and equipment resources may desire to use alternative methods. However, it is advisable that guidance from Stormwater360 be obtained prior to using alternative techniques. @2011 Stormwater360
Page 76
Table 5: MAINTENANCE EQUIPMENT REQUIREMENTS
Maintenance Equipment Required
Minor Maintenance Pre-Major Maintenance Major Maintenance Cartridge Replacement
Inspection
Safety Equipment*: First aid, Safety Equipment*: First aid, Safety Equipment*: First aid, cones, barricades, flagging,
cones, barricades, flagging, cones, barricades, flagging, flares, tape, vests, hard hats.
flares, tape, vests, hard hats. flares, tape, vests, hard hats.
Work Clothes: Rubber boots, Work Clothes: Rubber boots, Work Clothes: Rubber boots, overalls, and gloves.
overalls, and gloves. overalls, and gloves.
Door Bolt, Wrench, Door Bolt, Wrench, Door Bolt, Wrench, Pentasocket and Miscellaneous Tools.
proprietary lifters (e.g. Gatic) proprietary lifters (e.g.Gatic)
and Miscellaneous Tools. and Miscellaneous Tools.
Tape Measure Tape Measure Tape Measure
Flashlight Flashlight Flashlight
Grapple or Net Pole Grapple or Net Pole Grapple or Net Pole
Record Keeping Forms Record Keeping Forms Record Keeping Forms
Trash/Debris Container Trash/Debris Container Vacuum Truck
Replacement Cartridges
Cartridge Hauling Truck
Crane, Tripod and Hoist, or Other Lifting Device (150kg
minimum capacity)
Shovels
Extra SOmm PVC cartridge connectors
Spare Flow Restrictor disks
Trash/Debris Container
Vault Inlet Pipe Plug
Dolly
PVC Pipe Cutter
ladder
Cartridge Installation and Removal Sling
Confined space equipment may be required for vault entry. This equipment must be used by personnel with the appropriate OH & S training. This
equipment typically includes: Atmospheric testing devices, atmospheric purging and ventilating devices, and entry, exit, and rescue assisting
devices.
2.6 MATERIAL DISPOSAL
The accumulated sediment found in stormwater treatment and conveyance systems must be handled and
disposed of in a manner that will not allow the material to affect surface or ground water. It is possible for
sediments to contain measurable concentrations of heavy metals and organic chemicals (such as pesticides
and petroleum products). Areas with the greatest potential for high pollutant loading include industrial areas
and heavily traveled roads. Sediments and water must be disposed of in accordance with all applicable waste
disposal regulations. It is not appropriate to discharge these materials back to the stormwater drainage
system. Part of arranging for maintenance to occur should include coordination of disposal of solids (landfill
coordination) and liquids (municipal vacuum truck decant facility, local wastewater treatment plant, on-site
treatment and discharge). Owners should contact the local public works department and inquire about how
the department disposes of their street waste residuals. Disposal methods or reuse of the media contained in
the cartridges will be determined by Stormwater360. If the material has been contaminated with any unusual
substance, the cost of special handling and disposal will be the responsibility of the owner.
@2011 Stormwater360
Page 77
Enviropod Service Receipt
Site: Job Number:
Contractor: Receipt Number:
Location: Week Serviced:
Year:
Service Frequency:
Enviropods on Site:
Enviropods Cleaned:
Bags Checked: If Damaged,Action:
Frames and Seals Checked: If Damaged, Action:
Overflows Checked If Blocked, Cleaned:
Tonnage:
Comments
This service has been performed in accordance with Enviropod Management Plan (EMP)for above site. Please
file this receipt with EMP and keep on site for compliance inspections.
Signature:
Position:
@2011 Stormwater360
Page 78
@
N
o Enviropod Maintenance Form
f-’
f-’ Client: Bag: NOTE: See maps for detailed location.
VI
,.... Project: Date:
o ENVIROPOD Site.
3 Fullness. F.
Pit No. Map No. location Ba. SilO
:iE Date % O_!ganic:s % litter % Sediment 112 1/4 or 0 Notes Grate.
OJ
,....
(1)
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en
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9
10
11
12
13
14
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16
17
18
19
20
21
22
23
24
251
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Page 79
Sample StormFilter Minor Maintenance Inspection Data Sheet
Date: location:
System Size: TYPE: Cast-in-Place Precast linear
Personnel:
System Observations
Media Months in Service:
Oil and Grease in Forebay:
Sediment Depth in Forebay:
Sediment Depth on Vault Floor:
Structural Damage:
Estimated Flow from Drainage Pipes (if available):
Cartridges Submerged? (Yes _
No _)How Deep?
StormFilter Minor Maintenance Activities (check off if done and give description)
Remove Trash and Debris:
Minor Structural Repairs:
Drainage Area Report
Excessive Oil and Grease Loading (Yes No _)Source:
_
Sediment Accumulation on Pavement (Yes No _)Source:
_
Erosion of Landscaped Areas (Yes No _)Source:
_
Items Needing Further Work:
Comments:
@2011 Stormwater360
Page 80
Sample Storm Filter Major Maintenance Inspection Data Sheet
It may be desirable to conduct this inspection during a storm to observe the relative flow through the filter cartridges. If the
submerged cartridges are severely plugged, large amounts of sediments should be present, very little flow will be discharging from
the drainage pipes, and it is likely that the cartridges need to be replaced during major maintenance.
Date: location:
System Size: TYPE: Cast-In-Place Precast linear
Personnel:
System Observations
Media Months in Service:
Oil and Grease in Forebay:
Sediment Depth in Forebay:
Sediment Depth on Vault Floor:
Structural Damage:
Estimated Flow from Drainage Pipes (if available):
Cartridges Submerged? (Yes _
No _)How Deep?
Drainage Area Report
Excessive Oil and Grease loading (Yes No _)Source:
_
Sediment Accumulation on Pavement (Yes No _)Source:
_
Erosion of landscaped Areas (Yes No _)Source:
_
Comments:
Review the condition reports from the previous minor and major maintenance visits.
@2011 Stormwater360
Page 81
Sample StormFilter Major Maintenance/Cartridge Replacement Data Sheet
Date: location:
System Size: TYPE: Cast-in-Place Precast linear
Personnel:
list Safety Procedures and Equipment Used:
System Observations
Media Months in Service:
Oil and Grease in Forebay:
Sediment Depth in Forebay:
Sediment Depth on Vault Floor:
Structural Damage:
Drainage Area Report
Excessive Oil and Grease Loading (Yes No _)Source:
_
Sediment Accumulation on Pavement (Yes No _)Source:
_
Erosion of Landscaped Areas (Yes No _)Source:
_
Storm Filter Cartridge Replacement Maintenance Activities (checkoff it done and give description)
Remove Trash and Debris (Yes No _)Details:
_
Replace Cartridges (Yes _
No_) Details:
Sediment Removed (Yes _
No _)Details:
Quantity of Sediment Removed (estimate?):
Minor Structural Repairs (Yes No _)Details:
_
Residuals(debris, sediment) Disposal Methods:
Notes/Problems:
(92011Stormwater360
Page 82
iClkbed cc>n$iiltilig 12
innovation ingenuity in$pifation
A6N 89106 675156
~
Appendix A -
Drawings
Table 8: Drawings prepared by i3 consulting pty Itd
Drawing Number Drawing Description
13-024-C31 Stormwater Plan
13-024-C32 Stormwater Details
13-024-C33 Storm water Quality Details
13-024-C34 Catchment Plan
P age 119
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
Page 83
!c1.tbed. (’O!l$l’Illing
ionovatlon ingenuity inspitation
ABN 89106 675156
j~
.
.
Appendix B -
Calculations
Table 9: Discharge Calculation Table
Catchment Area
Maior Storm Event Q100 Minor Storm Event Q20 Treatable Storm Event Q3month
Intensit:{ Discharge Intensi!:l Discharge Intensit:{ Discharge
Catchment A 0.3494 ha 315 mm/hr 0.306 m3/s 247 mm/hr 0.221 m3/s 63 mm/hr 0.043 m3/s
Catchment B 0.1023 ha 315 mm/hr 0.090 m3/s 247 mm/hr 0.065 m3/s 63 mm/hr 0.013 m3/s
Catchment C 0.1893 ha 315 mm/hr 0.166 m3/s 247 mm/hr 0.119m3/s 63 mm/hr 0.023 m3/s
Catchment C 0.0094 ha 315 mm/hr 0.008 m3/s 247 mm/hr 0.006 m3/s 63 mm/hr 0.001 m3/s
Sample Calculations
MINOR STORM EVENT 0100
AREA 0.3494ha
RAINFALL INTENSITY
1,00 315mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C100 1.0
DISCHARGE
QlOo CIA 0.306 m3/s
360
MINOR STORM EVENT Qzo
AREA 0.3494ha
RAINFALL INTENSITY
I" 247mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C" L92
DISCHARGE
Q" CIA 0.090 m3/s
360
TREA TABLE STORM EVENT 03month
AREA 0.3494ha
RAINFALL INTENSITY
bmonth 63mm/hr (From AR&R)
For 5 minute duration
COEFICIENT OF RUNOFF
C3month 0.7
DISCHARGE
Q3month CIA 0.043 m3/s
360
P age 120
Level 2, 39 Sherwood Road [email protected] P: 07 3870 8888
Toowong QLD 4066 www.icubed.com.au F: 0738708988
Page 84
iCIIIHH! (1)Ilsulti1ig
innovation ingenuity inspifation
ABN 89106 675156
]-
.
,
Appendix C -
Music Output
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Sources Residual load .%Reduction
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Flow (ML/yr) 9046 9.12. 3.6
\ ~
Peak Flow (013/s) n.l71 0.345 -101.9
Total Suspended SorKls (’kg/yr) 2.70E3 227 91.6
Total Phosphorus (kg/yr) 5.03 1.53 -695
Total f.itrog:en (kgi/yr)
Gross Pollutants (kg/yr)
30.0
217
16.5
0.00
45.2
100.0 I
I~~II
Treatment Train Effectiveness
P age 121
Level 2, 39 Sherwood Road [email protected] P: 073870 8888
Toowong QLD 4066 www.icubed.com.au F: 07 3870 8988
The text continues on page 85.
Used in these records
Development Application part 7 of 10 Stormwater Management Report - MCU13/0092Related documentApplication case desk ↗
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