Rainfed rice - IRRI books - International Rice Research Institute

Sand dam
Water harvesting by using a sand
dam consists of constructing a dam
across a valley to reduce- the velocity
of flow of runoff water mixed with
sand. By doing this, the silt load of
runoff deposits over the bed. After
some time, the bottom of the valley is
raised by the deposited sand. The
silted part of the area covered by the
dam is known as the sand reservoir.
Water flowing through the valley is
stored in this sand dam reservoir
and is used for irrigation through
bore holes or dug wells.
Lot water storage system
This is a large earthen embankment in a shallow river basin along the river
bank which provides seepage water for irrigation at the lower stream.
Sometimes, seepage water stored in the lower part is used for irrigation
upstream, as well as at the lower stream through a channel using a water-
lifting device.
lndigenous Rainwater Management
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