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Natural rock catchment and Open water reservoir

302 bytes added, 18:56, 19 April 2012
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==Costs==
[[Image:RubbleStones.jpg|thumb|right|300px|Rubble stones save about 50% of the cost of cement, sand, and ballast. <br> Photo: [http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=3&ved=0CDcQFjAC&url=http%3A%2F%2Fwww.samsamwater.com%2Flibrary%2FBook1_Water_from_Rock_Outcrops.pdf&ei=Ys59T4_iLanM2gXA4NTlDA&usg=AFQjCNFY-XFDfUONAlG7HCp0p7Q4YDDOhw&sig2=UKAZc-rFHN-M4tfVsNOZGQ Water from Rock Outcrops.] DANIDA.]]
There are 3 types of rock catchment costs to compare:
# Earthen dams are the easiest and cheapest to construct using manual labor or animal draught (yet vulnerable to seepage, erosion, and evaporation).
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