rain gardens are used to trap stormwater ensuring that water is retained inland and water & pollutants are not washed into the sea. stormwater captured from houses is drained into water tanks before being heated to supply domestic hot water. wastewater/sewage is drained to the suburb's wastewater treatment plant, where it is recycled for (non-potable) reuse, with 300 megalitres stored to meet the demand for non-potable water while the remainder can be sold.