RFI - Engineering - Stormwater

EXTRACT FROM HEALTHY WATERWAYS DEEMED
TO COMPLY SOUTIONS FOR WATER QUALITY


[OCR of page images]
EXTRACT FROM HEALTHY WATERWAYS DEEMED
TO COMPLY SOUTIONS FOR WATER QUALITY

Deemed to Comply Solution R5

- utilising rainwater tank(s) and
bioretention system(s)

Deemed to Comply Solution R5 only applies to
residential development greater than 2 dwellings
(townhouse style up to 2 storeys) but <12,500m?
in site area.

REGION

South East Queensland
- Greater Brisbane

- North Coast

- West Region

- South Coast

NOTES

Region - Refer to STEP 1 of Selection and Design
Process of main document for schematic of
climatic regions

Rainwater Tank requirements defined by Queensland
Development Code MP 4.2 and 4.3. Refer to code to
confirm tank sizes.

Bioretention system filter media area refers to the
functional flat portion of the bioretention system only
and does not allow for coarse sediment capture and
batters/bunds to surrounding ground levels. The total
bioretention footprint area must be defined as part
of Selection and Design Process (STEP 7) to account
for batters and coarse sediment as well as filter media
area. Typically for small bioretention systems (<50m7?),
the Total Footprint Area = 3 X Filter Media Area. This
should be used as a starting point for the design process
and refined provided the proponent develops suitable
detailed concept drawings as part of the Development
Approval.

RAINWATER TANKS

Attached dwellings 3kL

BIORETENTION SYSTEM FILTER
MEDIA AREA (% of catchment area)

Detached dwellings SkL

1.1%
1.7%
0.9%

1.3%

Location on Public or Private Land - The bioretention
systems should remain on private land and be managed
by the owners (body corporate). There exists an option
to create a small parkland or drainage reserve for the
bioretention system which could be handed to the local
authority but this would require approval.