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Document 1 · OPW11/0177
From the archive Development Application - Part 2 of 3 - Stormwater Management Plan. File date in the archive: 2011-05-30 11:52.
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THIS IS THE NEXT PART OF A
MULTIPLE PART RECORD
Part P-,- Of
Application number: ()P(/J I f / 71
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2 7 MAY 2011
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TITEPROFESSIONAL ENGINEERS
DOCUMENT DISTRIBUTION REGISTER
No 1 The Esplanade, Maroodtydore Ph (07) 5443 2300 Fax (07) 5443 7126
PO Box 204. Maroodlydore, Old 4556 Email encineers(te net au
PROJECT: SETTLERS COVE DEVELOPMENT JOB No: S3000
CLIENT: CAPE BOUVARD DEVELOPMENTS PTY LTD PAGE No: I OF 1
No. DOCUMENT TITLE DOC. No. REVISION
1. Tate Professional Engineers S3000/L7&8/08/SMP
Stormwater Management Plan Dated October 2008
dated October 2008
2. Tate Professional Engineers S3000/L5&6/11/SMP
Stormwater Management Plan APRIL 2011
LOTS 5 & 6 dated APRIL 2011
DATE O F ISS UE
Issue 1 2 3 4 5 6 7 8 9 10
Day 03 05 26
Month 10 04 05
Year 08 11 11 El=
-
DISTRIBUTION REGISTER COP IES / REASON F OR ISSUE
1. Sunshine Coast Regional Council 4/a
1. Cape Bouvard Developments 1/x
2. Sunshine Coast Regional Council 2/a 3/a
2. Cape Bouvard Developments 1/x
A - Approval B - Building Approval C - Construction P - Preliminary
R - Revision T - For Tender X - Information
Practice Manual Page 1 of I Form No. F08(b)/0
Page 4
TiATE
PROFESSIONAL ENGINEERS
STORMWATER
MANAGEMENT PLAN
Proposed Residential Development
at
Lots 5 & 6 Serenity Close, Noosa Heads
for Cape Bouvard Developments Pty Ltd
S3000/L5&6/11/SWMP
APRIL 2011
SH/cf
Prepared by TATE PROFESSIONAL ENGINEERS PTY LTD
ABN 28 086 262035
Civil and Structural Engineering
Project Management
39-45 First Avenue
P. O. Box 1092
Mooloolaba, QId. 4557
Telephone: (07) 5457 5300
Facsimile: (07) 5477 6100
e-mail: [email protected]
The content of this document is provided in strict commercial confidence. The content of this
document shall not be disclosed to any third party, without the express written authority of
Tate Professional Engineers Ptv Ltd.
Document Control
Revision 53000/L5&6/11/SWMP - Auth orised for Issue
Author g
S1ire
No. Date Reviewer Si ture Document Status
April 2011 Steve Harrison Steve Harrison A
R - Revision F - Final A - Approval P - Preliminary
Page 5
- Contents - 1.0 INTRODUCTION ........................................................................................... I 2.0 EXISTING CONDITIONS .............................................................................1 3.0 PROPOSED DEVELOPMENT .....................................................................1 4.0 RAPID INFILTRATION PITS (RIP's) ........................................................ 1 5.0 CALCULATIONS ........................................................................................... 2 APPENDICES APPENDIX A - RIP Management and Maintenance Plan APPENDIX B - Fox BPT 600 Maintenance Schedule APPENDIX C - Prototype RIP Test Results APPENDIX D - Spreadsheet Model Results
Page 6
1.0 INTRODUCTION
This report is in support of an Operational Works application to Sunshine
Coast Regional Council seeking to develop a residential building at Lots 5 and
6 Serenity Close, Noosa Heads.
In particular, this report addresses water quality and stormwater management
issues raised in the Material Change of Use Decision Notice (Reference
2005/0699) for this project dated 6 December 2010.
2.0 EXISTING CONDITIONS
The subject site currently has bulk earthworks operations (basement
excavation) complete. The entire site consists of loose, poorly graded dunal
sand and as such contains no overland drainage paths since rainwater
infiltrates directly through the permeable surface.
3.0 PROPOSED DEVELOPMENT
Due to the sensitive nature of the local ecosystems, it is proposed to match
existing runoff conditions as closely as possible. In order to achieve this it is
proposed to reintroduce all runoff from impervious areas into the subsurface
via a series of rapid infiltration pits (RIP's). The remainder of the site will be
directed towards the numerous gardens on the site to infiltrate naturally.
4.0 RAPID INFILTRATION PITS (RIP's)
Runoff from impervious areas will be directed to a series of RIP's. Gutters and
spouting will be sized accordingly. Tate Professional Engineers have
conducted testing for infiltration rates for ground conditions within the
development site. Results were consistent indicating a liner relationship
between driving head and infiltration rate such that:
Infiltration Rate (mm/s) = 4mm/sec + 13.6 x head (m).
Stormwater runoff from roofs is to be conveyed to RIP's via pipework with
runoff from hardstand areas conveyed via vegetated swales. Rainwater
harvesting tanks are to be employed to capture and store roofwater for use in
irrigation.
S3000/L5&6/11/SWMP- Stormwater Management Plan April 2011 Page 1 of 2
SH/cf
Tate Professional Engineers Pty Ltd
Page 7
It is proposed to link the RIP's together by a pair of 150mm dia slotted uPVC
balance pipes to prevent overtopping should one RIP become inoperable.
5.0 CALCULATIONS
In order to model the operation of the RIP's, a spreadsheet has been developed
and used for similar projects in Noosa Shire.
Temporal patterns for Zone 3 from the Australian Rainfall and Runoff, Volume
2 were applied. These temporal patterns were used in conjunction with the
average rainfall intensities for the Noosa region to create a series of design
storms of varying duration for a 10 year or 100 year average return interval
(ARI), depending on location of the RIP.
Temporal patterns were converted to flow rates by breaking each storm event
into a series of short duration storms. A triangular flow verses time
approximation was used for each substorm with substorm flows then added to
produce flow Vs time for RIP inflow.
Outflow and water depth were then calculated through iterations for the
duration of the storm based on the infiltration rate / head relationship
discussed in Section 4. A factor of safety of 2.0 was applied to this infiltration
rate. Each RIP was then sized to prevent overtopping the appropriate design
storm event of any duration.
Spreadsheet model results are attached in Appendix C.
S3000/L5&6/11/SWMP- Stormwater Management Plan April 2011 Page 2 of 2
SH/cf
Tate Professional Engineers Pty Ltd
Page 8
/.1 RIP Management and Maintenance Plan [OCR of page images] A RIP Management and Maintenance Plan
Page 9
ELEMENT: MAINTENANCE OF RAPID
INFILTRATION PITS (RIP's)
1. Objective To ensure ongoing function of RIP's in reintroducing
runoff into the subsoil.
2. Management Strategy Treat runoff from vehicular hardstand areas via
grease/oil arrestor units prior to discharge to RIP's.
Regularly service grease/oil arrestor units and RIP's to
ensure ongoing function.
3. Actions 1. Grease/oil arrestor
- service as per manufacturers
recommendations
2. RIP's
Daily/storm events
- inspect for overtopping or blockage
Monthly
- inspect base of pit
- remove accumulated debris, silt and organic
matter and dispose of to waste
- inspect geofabric filter (BIDM A14 material)
- Clean/replace if clogged/torn/damaged
Annually
- replace geofabric filter
- inspect underlying sand filter layer for
contamination/clogging
- replace sand filter layer if required
4. Performance Indicators No overtopping of RIP's during design storm events
5. Frequency/Deadline Inspections as detailed above.
Reporting at monthly body corporate meetings.
6. Responsible Person Body corporate to ensure maintenance schedule
/Organisation adhered to.
Maintenance contractor to make entries in
environmental diary noting date of RIP service,
condition of RIP, material removed and means of
disposal.
7. Reporting and Review Maintenance Contractor to make entries in
environmental diary noting date of service, conditions,
material removed and means of disposal.
Body Corporate to keep record of grease/oil arrestor
and RIP servicing.
8. Corrective Action Review maintenance schedule as appropriate.
Page 10
Fox BPT 600 Maintenance Schedule [OCR of page images] Fox BPT 600 Maintenance Schedule
Page 11
To lift grate
remove 2 x
M8 bolts,
Schematic Detail of BPT600 Installation
Note: Do not distort pit walls
when compacting concrete.
Do not vibrate concrete near pit.
If installed in bitumen a concrete
collar must be provided. See
drawing A4-INST-1016/2 for
details.
Provide concrete thickening Class 'B' Grate
around pit. I 0
LO
150 O.D. Outlet Pipe
To Stormwater
Invert Level 320mm
Set in bedding
sand or similar.
Available Options
225mm Stormwater Outlet
FOX SYSTIF M
S MENTAL
This Drawing and design is the Property of Fox
Class 'D' Grate Environmental Systems Pty Ltd. It must not be used
Note: Inverts will change. for any other purpose than that for which it was
issued. This drawing must not be shown or lent to
Request details if required. anyone without the written permission of the Fox
Environmental Systems Pty Ltd.
Project:
Note:
Installation Instructions
This is a schematic representation only. Drawing Title:
Slab size and gradient to engineers
details as arranged by customer. BPT600 with 150mm Outlet
All plumbing and electrical connections 0880
to be installed by certified tradesmen in
accordance with relative authorities Drawn by: R.O'B.
requirements. Tradesmen to be engaged
Date: 8/12/2006
by the purchaser.
System to be approved by relative Local Scale: NTS
Authorities before Installation.
Drawing No: A4 - INST-1016/1
Page 12
Housekeeping
To ensure that the Fox Model BPT600 unit performs the function for which it is installed there are some very
basic housekeeping functions that need to be performed. The interval between these activities is very much
site specific. A responsible approach to these functions will provide the maximum benefit to the environment.
• When large items of floating debris (such as plastic bags, drink cans etc.) are observed on the inlet
grate of the unit they should be collected and disposed of in a suitable manner. The Fox BPT600 does
not capture these items they simply prevent them from entering the stormwater discharge through the
unit. If they are not removed they could still be harmful to the environment if they are washed or
blown off the site.
• Regularly inspect the unit for a build up of captured pollutants within the silt basket. This should be
done on a weekly basis or more often if large quantities of silts are being retrieved.
• To empty the silt basket the slide bolt on the grate should be slid back using a screwdriver or similar
and the grate lifted and moved forward to enable access to be gained to the basket.
Please note that the grate is heavy and proper care should be taken when removing it.
• Remove the silt basket and dispose of captured pollutants in a suitable manner such as
emptying it in a garbage bin or similar.
• As soon as the basket has been emptied it must be replaced and the grate returned to its'
locked position.
For safety reasons the unit should never be left unattended when the grate and basket are
removed. For maximum environmental protection and to reduce maintenance costs the silt
basket should always be in place within the unit.
Regular servicing of the Chamber.
From time to time the chamber of the unit will need to be cleaned of silt build up and retained hydrocarbons.
The frequency of this activity will depend on the site conditions of each installation.
• Fox Environmental Systems recommend that initially the units are cleaned on a 3 monthly basis. This
service should consist of a minimum of the following activities.
• Carefully capture any floating hydrocarbons in the chamber.
Captured hydrocarbons must be disposed of in a manner prescribed in the Environmental
Protection Act.
• Pump water from within the chamber and filter through a minimum 20 micron filter before
allowing discharging into the stormwater system.
n Remove all silt and sediment build up from within the chamber and dispose of it in a suitable
manner such as emptying it in a garbage bin or similar.
n Following each service quantities of pollutants that are removed should be recorded to enable
proper assessment of the serving frequencies required to be ascertained.
Fox Environmenta/Systems Pty Ltd offers a full service for the maintenance of the BPT600 units
in SE Queensland. Contact our Service Manager on (07) 5437 8455 for information and costing.
Page 13
Prototype RIP Test Results [OCR of page images] C Prototype RIP Test Results
Page 14
TABLE 1.0
RESULTS OF PROTOTYPE INFILTRATION PIT (IP)
TESTING 23 JULY 2001
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10 20 30 40 50
I INFILTRATION RATE (mm/SEC)
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Page 15
Spreadsheet Model Results [OCR of page images] Spreadsheet Model Results
Used in these records
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