Attachment G - Stormwater Quality Management plan

 

NOTES:

Bioretention media specification shall be in
accordance with the Facility for Advancing
Biofiltration "Guidelines for Soil Filter Media in
Bioretention Systems”. Bioretention hydraulic
conductivity shall be in accordance with the
Facility for Advancing Biofiltration "Practice Note 1:
In Situ Measurement of Hydraulic Conductivity”.
The number of samples to be tested shall be in

accordance with the "Water Sensitive Urban Design
Construction and Establishment Guidelines —

Swales, Bioretention Systems and Wetlands” (Water
by Design).

2. Under—drain: slotted rigid pipe (uPVC or similar to

AS 2439.1) or approved equivalent, 0.5% MIN.
grade. Refer project drawings for diameter and
invert level (typically @100-150). Pipe joins should
be glued using plumbing cement. Pipe should not
be installed with a filter sock surrounding pipe.
Under—drainage pipes shall be sealed into pits
using grout or other approved watertight seal.

3. Refer to project drawings for vegetated batter

slopes (1 in 3 MAX, 1 in 4 typical) and batter
topsoil requirements.

4. Filter cloth — non-woven geotextile. Filter cloth

not to be placed between any filter

layers. Impervious liner may be required subject to
soil testing requirements in accordance with the
‘Water Sensitive Urban Design Technical Design
Guidelines” (Water by Design).

5. Basin finished surface level is top of filter media.

Surface to be mulched and planted as per
landscape drawings.

6. Construction tolerances as documented in the

"Water Sensitive Urban Design Construction and
Establishment Guidelines — Swales, Bioretention
Systems and Wetlands” (Water by Design) must be
achieved. Construction tolerances must be noted
on project plans. Invert levels of pits and pipes
and base levels must be shown on project
drawings.

7. Refer landscape drawings for plant specification.

Plant specification and density shall be in
accordance with the "Water Sensitive Urban Design
Technical Design Guidelines” (Water by Design).

8. All dimensions are in millimetres unless otherwise

C.l. cap. extend cap to
approx. 150 above
ees basin surface

YW V/

Subsoil drain cleanout —

pvc pipe (non slotted)

and connector cleanouts

at head of subsoil drain
4S

‘Y’ branch
Refer note 2

Provide locking function or
secure cap with screws

V/

fer
No te
3

\

 

 

[p

Filter cloth extend
500mm up batter
under topsoil pinned to
batter, refer note 4.

 

 

 

 

Mulch layer — 50-75,
refer note 5

Bioretention basin finished surface level,
refer project drawings and notes 5 and 7

|\~——— Filter media — loamy sand,
refer project drawings for depth,
500 (typical) 400 MIN

Transition layer — coarse sand,

constant depth — 100, refer note 1

 

135° Bend, refer note 2 |

nom. size 0.5-2.0

 

 

 

k——— Drainage layer — fine aggregate,

 

 

constant depth — 200,

 

 

nom. size 2-5

 

Provide end cap at head

of subsoil drain Filter cloth, refer note 4

| | —DRAI T — | l

Provide locking function or C.l. cap. extend cap to

 

\Besin base to grade at 0.5% MIN to overflow pit, refer note 6

50 MIN cover of drainage
layer (fine aggregate) over
under drainage pipe

 

Mulch layer — 50-75,

 

 

 

secure cap with ene approx. 150 above
batter surface
ee Filter cloth extend 500
l~ up batter under topsoil
pinned to batter, refer note 4 VV
135° Bend,
Subsoil drain cleanout foe note 2
pvc pipe (non slotted) *Y’ branch,

 

and connector cleanouts

at head of subsoil drain refer note 2

—————_ _ _

refer note 5

Pw

|I~_—— Filter media — loamy sand,
refer project drawings for depth,
500 (typical) 400 MIN

Bioretention basin finished surface level,
refer project drawings and notes 6 and 7

Transition layer — coarse sand,

constant depth — 100, refer note 1

 

Provide end cap at head l

nom. size 0.5-2.0

 

 

 

<= Drainage layer — fine aggregate,

 

of subsoil fone

 

 

constant depth — 200,
nom. size 2-5

 

 

 

Basin base to grade at 0.5% MIN
to overflow pit, refer note 6

Filter cloth, refer note 4 a

BIORETENTION UNDER—DRAIN CLEANOUT — IN BATTER

150 MIN cover of drainage
layer (fine aggregate) over
under drainage pipe

 

 

 

 

 

 

 

 

 

 

 

 

 

noted.
These drawings have been developed in consultation between the participating councils.
BEFORE USE, the user shall confirm that the drawing has been adopted by the appropriate council
INSTITUTE OF PUBLIC WORKS ENGINEERING AUSTRALIA BIORETENTION STANDARD PROFILE we Hy
QUEENSLAND DIVISION INC. UNDERDRAIN CLEANOUT WSUD—003 =
A 13, 1/2010 ORIGINAL ISSUE — STANDARD DRAWINGS La