In the
ancient time people used to harvest rain water in natural ponds or in
underground tanks. Rain water fall on roof of building is stored in underground
tank through gutter and pipes. The capacity of underground tank depends upon annual
rain fall, runoff coefficient & area of roof. For example roof is 12 meter length
and 6 meter wide. The area of roof is 72 Square meter. The annual average (ten
years) rain fall is 300 mm, the runoff coefficient is 0.8, than capacity of underground
will be 17280 liters. The total cost including pipes and other construction
will be Rs.60000/- approx. The farmers can harvest water in their farm. They
choose the catchment area according to their need of water. In the Barmer
district the water is harvested in underground tank called “TANKA”.
The capacity of this tanka is 20000
liters to 1.00 lac liters. The material used for tanka is cement, coarse sand,
fine sand and concrete 20mm. The catchment area 100 to 200 Square meter is
provided. About 500 tankas have been prepared under my supervision with the
help of Cairn India CSR programe.
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