Water captured by the stormwater system. Each ecosystem is characterized by a stormwater drainage capacity which describes how much water can be captured.
Stormwater drainage = runoff - runoff after streams
Used to calculate: floodwaters and leaky pipes
Depends upon:
—Parameters: proportion of impervious surface, stormwater drainage capacity and stream drainage capacity
—Other metrics: impervious runoff from hardtops, pervious runoff from soil and runoff into streams