IWMP-11 - Commissionerate of Rural Development Gujarat State ...
IWMP-11 - Commissionerate of Rural Development Gujarat State ...
IWMP-11 - Commissionerate of Rural Development Gujarat State ...
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PIA: DWDU, Amreli<br />
Check dams<br />
Check dams are constructed across small streams having gentle slope, the selected should have sufficient thickness <strong>of</strong> permeable bed or<br />
weathered formation to facilitate recharge <strong>of</strong> stored water within short span <strong>of</strong> time. The surface water stored in these structures is mostly<br />
confined to stream course and the height is normally less than 2m and excess water is allowed to flow over the wall in order to avoid<br />
scouring from excess run<strong>of</strong>f water cushions are provided at downstream side. To harness the maximum run <strong>of</strong>f in the stream series <strong>of</strong> such<br />
check dams are to be constructed to have recharge on regional scale in project villages.<br />
Pond<br />
Natural or man-made water bodies which usually serves the population <strong>of</strong> a village as well as agriculture fields. Ponds greatly vary in size<br />
depending upon the rainfall. These have only a few meters <strong>of</strong> length and width and are built across the flow path <strong>of</strong> natural drainage<br />
channels. Surplus water from one pond spills over to a lower pond. In some cases a series <strong>of</strong> ponds are built on one single stream. Each<br />
pond caters to the irrigation needs <strong>of</strong> one farm and also augments ground water recharge.<br />
Waste weirs<br />
These are constructed for giving a safe passage to the excess run<strong>of</strong>f from the field and also store some amount <strong>of</strong> water in the field. The<br />
water stored in these structures is mostly confined in field and height is normally less than 1 mt. and excess water is allowed to flow over<br />
the wall.<br />
Percolation Tank: Percolation dams are constructed for recharging groundwater. Such structures are usually made on the upper part <strong>of</strong> the<br />
catchment area. Water stored here percolates to wells and tube wells located in the lower part <strong>of</strong> the catchment. Such dams can also be<br />
made in the immediate upstream portion <strong>of</strong> wells and tube wells. Depending on the capacity <strong>of</strong> the dam and duration <strong>of</strong> water storage, the<br />
dam can have secondary benefits that are vital for the livelihood security <strong>of</strong> marginal farmers and landless labourers.<br />
District Watershed <strong>Development</strong> Unit, Amreli 54
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