International Conference on Rain Water Cistern Systems
USA - June 1982
3: Design, Cost, And Policy
Policy for a Rain Water Cistern System
Lo & Yu-Si Fok
University of Hawaii at Manoa, USA
Rain water cistern systems have long been a water supply source in many countries.
In some rural areas where municipal water is limited or unavailable, rain water
for domestic use is caught on roofs and stored in water tanks. To design an efficient
catchment system, adequate catchment area and cistern capacity in relation to
water demand are factors that have to be carefully selected and designed to suit
the rainfall pattern of the design area. If the average rainfall could be daily
obtained, only enough catchment and storage would be needed to satisfy respectively
the daily water demand and peak loads. However, there are many areas with frequent
droughts that can last for months. Severe water shortage problems emerge even
with extremely large catchment and storage. To alleviate such problems, the operating
rule of the catchment system must be modified. Appropriate water use reduction
imposed prior to the onset of dry weather may save enough water to last through
The following sections describe a linear and a non-linear reduction strategy,
and their performance is compared to the classical unadjusted operating policy.'
Conclusions are then drawn in relation to the proper form of rain water cistern
system operation policy.
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