08/1128 - Response to Information Request [As Published] · 132008.1128

 

eS Chapter,5— Bioretention Basins

 

 

 

 

 

 

 

 

Asset ILD.

Basin Location:

Hydrautics: Minor Flood (m/s) Major Flood ims):
Area: Catchment Area (ha): 'Bioretention Area (ha):

 

 

 

TREATMENT . . Y iN

 

Treatment performance verified from curves?

 

BIORETENTION MEDIA AND UNDER-DRAINAGE . Y IN

 

Design documents bioretention area and extended detention depth as defined by treatment performance requirements.

 

Overall flaw conveyance system sufficient for design fload event(s)?

 

Where required, bypass sufficient for conveyance of design flood event?

 

Where required scour protection provided at inflow point to bioretention?

 

Bioretention media specification includes details of filter media, drainage layer and transiton layer {if required)?

 

Design saturated hydraulic conductivity included in specification?

 

Transition layer provided where drainage tayer consists of gravel (rather than coarse sand)?

 

Perforated pipe capacity > infittration capacity of filter media?

 

Selected filter media hydraulic conductivity > 10 x hydraulic conductivity of surrounding soil?

 

Liner provided if selected filter media hydraulic conductivity < 10 x hydraulic conductivity of surrounding soil?

 

Maximum spacing of collection pipes <1.5m?

 

Collection pipes extended to surface to aliow inspection and flushing?

 

“Maximum upstream flood conveyance complies with QUOM?

 

“Overflow pit has set down of at least 50mm below kerb invert? (where conventional gullyAintel used downstream of
bioretention then no overflow pit required)

BASIN . ° “ly N

 

 

Bioretantion area and extended detention depth documented to satisfy treatment requirements?

 

‘Overtlow pit crest set at top of extended detention?

 

Maximum ponding depth will not impact on pubiic safety?

 

Maintenance access provided to surface of bioretention system (for larger systems)?

 

Protection from coarse sediments provided (where required) with a sediment forebay?

 

Protection from gross pollutants provided {where required)?

 

LANDSCAPE : . Y “IN

 

Plant species selected can tolerate extended dry periods, periodic inundation and design velocities?

 

Bioretention design and piant species selected integrate with surrounding landscape or built environment design?

 

 

 

*Pianting design conforms with acceptable sight line and safety requirements?

 

COMMENTS

 

 

 

 

*Streetscape application only

  

Ti
Pe sine

<1 WSUD Technical Design Guidelines for South East Queensland - Version 1 June 2006 5-28