International Conference on Rain Water Cistern Systems
St Thomas, Virgin
Islands - June, 1984
F: Economic Considerations
Yield And Cost Of Water
Supplies From Rain-Fed Cisterns: Puerto Rico
L. Morris Gaddiel Ayala
Dept. of Natural Resources Puerto Rico
Rainfall cisterns have traditionally been used as a source of potable water
supply in Puerto Rico, and in some regions cisterns may yet represent a cost-effective
alternative to conventional. forms of public water supply development. Yield and
cost analysis of cistern supplies for Puerto Rico are compared with conventional
water supplies, and may be used as a basis for determining when public policy
should promote cistern construction.
Rainfall data from six climatic regions in Puerto Rico are analyzed to synthesize
the relationship among catchment area, storage and yield for cisterns. Yield,
relationships are presented summarizing the catchment area and cistern volume
needed in each part of Puerto Rico to provide a desired level of water supply,
either with or without water rationing during drought.
Regional catchment area and storage requirements are determined for each climatic
region, and this is compared to the typical cost of conventional water supplies.
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