Response to Council's Information Request · MCU14/0077

 

RECOMMENDATIONS FOR ESTABLISHMENT & OPERATION:

PHASE OF ESTABLISHMENT:

The first 2 Years after construction are crucial for the performance of the VBFS.
“**Ensure the right plant selection (refer "Healthy Waterways" for plant selection)
*“*During dry periods provide sufficient watering

***Perform regular weed removal

****Replace not established plants where required

OPERATIONAL PHASE:

e Perform routine inspections of the raingarden (VBFS) to identify any areas of obvious increased sediment deposition, scouring from

storm flows, rill erosion of the batters from lateral inflows and clogging

Remove sediment build ups in the raingarden

Repair any damage from vehicle traffic

Provide regular irrigation/watering during extended dry periods
Remove any invasive weeds at any time

Remove plants that have died and replace them

RECOMMENDATION:

Perform routine inspections of the inflow systems in particular the grated drain and clean the grated drain regular from debris and litter
Perform routine inspections of the surface of the raingarden and clean from litter and gross pollutants

Perform regular pruning as to Landscape Architects schedule to encourage growth and healthy establishment of plants
Perform vegetation pest minotoring and control as to Landscape Architects schedule

THE RAINGARDEN IS PROPOSED TO BE A STORMWATER TREATMENT DEVICE AS OPPOSED TO A NORMAL GARDEN
BED. WE RECOMMEND TO SET UP A SIGN EXPLAINING THE PURPOSE OF THE RAINGARDEN.

WIDTH AS SPECIFIED IN PLAN VEGETATED BIO RETENTION SYSTEM LENGTH AS SPECIFIED IN PLAN
Use for mulching: LUCERN, WOODCHIP OR EQUIVALENT.

WIDTH AS SPECIFIED IN PLAN

 

     

NOTES:
1. Use LUCERN OR EQUIVALENT for mulching

 

 

 

FILTER LAYER:

Clay 2-4% (<0.002mm)
Silt 4-8% (0.002-0.05mm)
Very Fine Sand —_5-10%(0.05-0.15mm)

Fine Sand 10-25% (0.15-0.25mm)
Med./Coarse Sand 60-70% (0.25-1.0mm)
Coarse Sand 7-10%(1.0-2.0mm)

 

     
         
     
   

2. Do not use organic Soils or soil fractions
for filter layer.

3. Provide a suitable irragation system required
for the establishment of the plants and for
use in extended dry periods. Irragation
system shall be supplied from the
harvesting tanks.

4. Do not use any geotextile or related

 

TRANSITION LAYER:
Coarse Sand 100% 0.5-2 mm

 

   
   
   

products between filter and transition or
between transition and drainage layers.

 

 

 

 

DRAINAGE LAYER:
CO: EO WOQO SE Fine Gravel 100% 2-5 mm

 

 

 

 

 

 

 

Provide PVC perforated pipe with
diameter as specified in plan.
Minimum 2 off.

5. Geotextiles may be used in addition to the
impermeable concrete & block surrounds.

6. Provide flush out points for subsurface

drainage.

   
     
   

 

 

jd

Connect subsoil
drainage to stormwater
infrastructure as
specified in plan.

 

 

VEGETATED BIO FILTER STRIP SOIL SPECIFICATION

 

(NOT TO SCALE)

 

NOTES:
1. Provide selected plants as to specification of
”Healthy Waterways” http://www.healthywaterways.org/

2. Provide "FOREBAY’ made of rocks and pebbles. For
scour protection. Refer detailed design for area.

MAINTENANCE PLAN

 

 

WATER SENSITIVE URBAN DESIGN TECHNICAL DESIGN GUIDELINES FOR SOUTH EAST

QUEENSLAND (Chapter 5, Item 5.6).

The maintenance of the bioretention basin elements involve:

e 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 of "boggy" filter media surface).

e —_ 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 erosions or vehicle damage by replacement of

appropriate fill (to match onsite soils) and revegetating.

the plant schedule.

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 equivilant size and species as detailed in

Pruning to remove dead or diseased vegetation material and to stimulate growth.

Vegetation pest monitoring and control.

Refer "Water by design" by HEALTHY WATERWAYS.

 

 

647m? NTRS

 

 

 

 

XS

 

 

 

 

 

 

 

 

ROOF

806m?

7

7

DRIVEWAY

 

BIO RETENTION SYSTEM

TREATMENT TRAIN

 

800

 

 

from carpark
to raingarden

A raingarden is a garden bed which

 

500

uses native plants and free drainage

 

soils to treat the pollutants formed in

 

 

 

 

50

 

to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

lo stormwater that runs off the driveway Cc ree k
~ and carpark. Raingardens help to
protect our waterways.
! 0
BIORETENTION FILTER & RAINGARDEN MAINTENANCE CHECKLIST
BODY . .
CORPORATE NAME: DATE:
RESPONSIBILITY CENTRE . .
MANAGEMENT NAME: DATE:
OWNER NAME: DATE:
PROVIDE NAME AND DETAILS OF
MONTHLY CONSULTANT IF APPOINTED:
INSPECTION QUARTER
FREQUENCY 6—MONTHLY
DROUGHT
AFTER EVENT
INSPECTION ITEMS YES _|NO ACTION REQUIRED

 

 

Overall appearance healthy?

 

Overall appearance clean?

 

Gross litter_on surface?

 

 

Sediment accumulation at inlet?

 

Sediment accumulation on pebble surface?

 

[Sediment accumulation at pipe outlets?

 

[Sediment accumulation in bypass chamber?

DISCLAIMER — ENSURE ORIGINAL SIZE DRAWING IS USED
FOR ASSESSMENT, TENDERING AND CONSTRUCTION.

 

[Amd Description Date

 

 

 

 

 

Erosion at forebay?

 

Erosion at overflow?

 

 

Any other erosion?

 

 

 

 

Damage of support structure?

 

 

Any other traffic damage present?

 

 

Damage to grates and lids?

 

 

 

 

Visual plant health ok?

 

Weeds apparent? Weeding required?

A | NEW ARCHITECTURAL LAYOUT; RESPONSE TO RFI 15-10-14

 

 

 

 

Watering required?

 

 

Irrigation functional?

 

 

Replanting required?

Issue Notes Date
For Development Approval] X 21-05-14
For Building Approval x 21-05-14
For Tender

 

 

Mowing/slashing/pruning required?

For Construction

 

 

 

Surface clogging visible?

 

Excess ponding evident?

 

Flushing required?

 

 

Point of discharge inspected (pit/headwall/swale/creek)?

 

 

 

OTHER
OBSERVATIONS

 

 

 

SIGNATURE & DATE:

 

 

 

 

 

 

RETENTION TANK

 

 

 

 

RECEIVING WATERWAYS

As Constructed

 

 

 

 

E Hydraulic ::

 

 

 

 

 

 

 

Va
contact: Reinhold Koenning MiEAust RPEQ No 7023
PO Box 181
Moffat Beach, QLD, 4551
email: [email protected]
PH: (07) 5491 4333 FX: (07) 5491 4233
CLIENT :
WILSON CLARK CONSTRUCTIONS
ARCHITECT :
LL COOL ARCHITECTURE J
(PROJECT: 10/100 RENE STREET Y
NOOSAVILLE
DRAWING TITLE:
\
STORMWATER
QUALITY
MAINTENENCE
Design| RK. | checked | Cro [Date 21-05-14 | Dwg, No. AMD.
SCALE : N/A ON At UNo.| 4 of 6 2864—-OP4 A]

 

 

 

 

 

 

RPD:— LOT 10 SP 230643