Water supply codes generally do not recognise the stochastic nature of water supply demands and there is little published information about the exceedance probabilities, or return intervals of peaking factors. This is a limitation to water supply practitioners who generally can only use single value water supply peaking factors whereas the availability of stochastic based peaking factors would allow water supply infrastructure to be sized to match their levels of importance and quantitative risk assessments to be undertaken. Designers involved in drainage infrastructure can choose between a 1 in 5-year, 10-year or some other return interval flood event, depending on its importance. Shouldn't that same flexibility also be available for practitioners working with water supply infrastructure?
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