The performance of onsite rainwater harvesting (RWH) system in Mediterranean climate was assessed. A stochastic model quantifying the necessary 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: water saving efficiency (RSE) – proportion of water used supplied by the RWH system; and rainwater use efficiency (RUE) – 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 necessary storage.
Stochastic modelling of the hydraulic performance of an onsite rainwater harvesting system in Mediterranean climate
H. Muklada, Y. Gilboa, E. Friedler; Stochastic modelling of the hydraulic performance of an onsite rainwater harvesting system in Mediterranean climate. Water Supply 1 December 2016; 16 (6): 1614–1623. doi: https://doi.org/10.2166/ws.2016.082
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