Selected residential streets in Cowandilla and Mile End required stormwater upgrades. A few roads with a relatively flat grade were not currently serviced by an underground drainage network. Council sought a drainage solution that allowed for partial road reconstruction while incorporating water sensitive urban design features in the form of ‘rain gardens’.
Tonkin Consulting provided concept and detailed design for the road reconstruction, stormwater drainage and rain gardens and construction supervision.
The designs incorporated approximately 100m of road and 500m of stormwater drain to be reconstructed. The catchment and drainage network was modelled in DRAINS to determine the capacity of the new underground collection system. Modelling found the capacity of the new drain was constrained by the diameter and depth of the existing connection point.
Rain garden designs offer the following benefits.