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沙坝
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[[File:SandDam_OM.jpg|none|600px|]]
====Estimated Lifespan预计使用寿命====The lifespan depends on the materials used and expertise with which it is constructed and maintained. The dams in Kitui Kenya were built at a cost of US$7,500 and have a minimum lifespan of 50 years.沙坝的使用寿命由两方面来决定:第一,使用的建材;第二,建坝和维护时使用的专业知识。肯尼亚基图伊的水坝耗资7500美元,最短使用寿命为50年。
===Costs成本===
The construction of dams is largely carried out by the local community. Costs mainly relate to local availability of cement, masonry and professional supervision.