'Rule of treatment areas for various catchment types WSUD Treatment Catchment Size of Flow reduction Pollutant Pollutant Pollutant Cost/kg Cost/kg treatment and/or water reduction reduction reduction (annualised) measure conservation (kg/yr) (kg/yr)TP (kg/yr)TN TSS TN benefit (kL/yr) TSS Rainwater tank^ 1 x 250 m2 roof (tank 2 KL per 32 1 0.01 0.08 $70 $1,000 plumbed to toilet and household garden irrigation) Wetland and 10 ha urban (70% 3000 m2 -300 6500 2900 3.8 23 $6 $700 harvesting scheme+ impervious) m3 Raingarden* 100 m2 road or car 1 m2 0 10 0.01 0.04 $6 $1,700 park (100% impervious) Raingardens (or tree 1 km road (7m wide, 80 m2 0 700 0.9 2.5 $7 ($16) $2,000 pits)* 100% impervious) ($4,500) Infiltration 1 km road (7m wide, 50 m2 360 690 0.9 2.6 $5 ($10) $1,200 raingardens (or tree 100% impervious) ($2,700) pits)#
'Rule of treatment areas for various catchment types WSUD Treatment Catchment Size of treatment measure Flow reduction and/or water conservation benefit (kL/yr) Pollutant reduction (kg/yr) TSS Pollutant reduction (kg/yr)TP Pollutant reduction (kg/yr)TN Cost/kg TSS Cost/kg (annualised) TN Rainwater tank^ 1 x 250 m2 roof (tank plumbed to toilet and garden irrigation) 2 KL per household 32 1 0.01 0.08 $70 $1,000 Wetland and harvesting scheme+ 10 ha urban (70% impervious) 3000 m2 -300 m3 6500 2900 3.8 23 $6 $700 Raingarden* 100 m2 road or car park (100% impervious) 1 m2 0 10 0.01 0.04 $6 $1,700 Raingardens (or tree pits)* 1 km road (7m wide, 100% impervious) 80 m2 0 700 0.9 2.5 $7 ($16) $2,000 ($4,500) Infiltration raingardens (or tree pits)# 1 km road (7m wide, 100% impervious) 50 m2 360 690 0.9 2.6 $5 ($10) $1,200 ($2,700)
integrated-water-management-strategy-accessible-version.docx