CIRIA RP992 The SuDS Manual Update: Paper RP992/29 Design Assessment Checklists for Ponds/ Wetlands Design Assessment Checklists for Ponds/ Wetlands Table 1 Deemed to Comply Requirements: Ponds / Wetlands Parameter Deemed to comply requirements Pond Wetland Length to width ratio Between 3:1 and 5:1 >3:1 Maximum depth of permanent water 2m 2m Maximum side slopes 1 in 3 (ideally at least 1 in 4 for habitat) 1 in 3 (ideally at least 1 in 4 for habitat) Width of aquatic bench >1m >1m Slope of aquatic bench 1 in 15 1 in 15 Maximum depth of aquatic bench 450mm 450mm Width of safety bench >3.5m >3.5m Slope of safety bench Less than 1 in 15 Less than 1 in 15 Maximum rise in water level for 1 in 100 year event 1.5m 1.5m Wetland mosaic – water depths/areas N/A Maximum 20% of water area >1m 30% if water area between 0.5m and 1m 50% of water area between 0m and 0.5m For the 1 year, 30 min event meet the following requirement: Size of permanent pool = treatment volume, V t = treatment volume, V t Maximum water velocity N/A <0.1m/s Table 2 Design Assessment Checklist: Pond / Wetland 1
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CIRIA RP992 The SuDS Manual Update: Paper RP992/29
Design Assessment Checklists for Ponds/ Wetlands
Design Assessment Checklists for Ponds/ WetlandsTable 1 Deemed to Comply Requirements: Ponds / Wetlands
Parameter Deemed to comply requirements
Pond Wetland
Length to width ratio Between 3:1 and 5:1 >3:1
Maximum depth of permanent water
2m 2m
Maximum side slopes 1 in 3 (ideally at least 1 in 4 for habitat)
1 in 3 (ideally at least 1 in 4 for habitat)
Width of aquatic bench >1m >1m
Slope of aquatic bench 1 in 15 1 in 15
Maximum depth of aquatic bench 450mm 450mm
Width of safety bench >3.5m >3.5m
Slope of safety bench Less than 1 in 15 Less than 1 in 15
Maximum rise in water level for 1 in 100 year event
1.5m 1.5m
Wetland mosaic – water depths/areas
N/A Maximum 20% of water area >1m30% if water area between 0.5m and 1m50% of water area between 0m and 0.5m
For the 1 year, 30 min event meet the following requirement:
Size of permanent pool = treatment volume, Vt = treatment volume, Vt
Note: Input range if applied to > 1 system. If there is a DtCR (as indicated) confirm whether or not this is met and provide details of any variations.