Component: Rainwater harvesting 

Description

Rainwater from roofs and hard surfaces can be stored and used. If designed appropriately, the systems can also be used to reduce the rates and volumes of runoff.

 

Water butts are the most common means of harvesting rainwater, although they are primarily designed for small scale use such as in gardens. Therefore the relative cost, maintenance and performance of water butts when compared to other larger rainwater harvesting systems are significantly less.

 

Advantages and disadvantages

 

Advantages

With careful design, can provide source control of stormwater runoff Reduces demand on mains water.

Disadvantages

Systems can be complex and costly to install Above ground tanks can be unsightly Potential requirement for pumping Perceived risks to public health

 

Where component can be used?

Residential:  Yes

Commercial/industrial:  Yes

High density:  Yes

Retrofit:  Yes

Contaminated sites:  Yes

Sites above vulnerable groundwater: Yes

 

Performance

Peak flow reduction:  High (depends on design)

Volume reduction:  High (depends on design)

Water quality treatment: Poor

Amenity potential:  Poor

Ecology potential:  Poor

 

Maintainance

• Inspection and cleaning of collection systems, filters, throttles and vales, pumps.