Like low rise commercial buildings, residential precincts often have large roof or ground level car parking areas that provide a high conversion of rainfall to runoff and lend themselves well to rainwater or stormwater harvesting systems.

High water uses suitable for alternative water supply in residential precincts include:

 Toilet flushing;

Landscape irrigation;

Water features;

Cooling tower make-up water;

Laundry; and

Vehicle wash.