The performance of onsite RWH (rainwater harvesting) system in Mediterranean climate was assessed. A stochastic model quantifying the needed storage, as a function of rainfall (frequency, depth), roof area, residents’ number, specific water use (toilet flushing, laundry) and the required efficiency was developed. Two performance indicators were calculated: WSE (water saving efficiency) - proportion of water used supplied by the RWH system; RUE (rainwater use efficiency) - proportion of rainwater actually used. The maximum storage capacity and WSE decreased with increasing number of residents for a given roof area, and with an increasing roof area for constant number of residents. For variable storage volume, RUE increased with increasing storage capacity and reached a maximum with an increase in residents’ number and a decrease in the roof area. The model enables to determine WSE and RUE for specific storage volumes or to determine the desired WSE and calculate the needed storage.
- alternative water source
- Mediterranean climate
- rainwater harvesting
- stochastic modelling
- water saving
- First received 10 February 2016.
- Accepted in revised form 28 April 2016.
- © IWA Publishing 2016