Changes

Water Portal / Rainwater Harvesting / Groundwater recharge / Leaky dams

311 bytes added, 23:12, 17 April 2012

→‎Construction, operations and maintenance

The dam can be made from rocks of various sizes (boulders, cobbles, stones, large gravel) that are found in and around the riverbed. In Pakistan, rocks of 200mm diameter were used. In Balochistan, the rocks are held within wire mesh nets that are built in 5 steps to total height of 4.9 metres. The exact height of the dam will vary and depend on the riverbed topography. A reinforced concrete cut-off 1.5 metres deep with 2 metre toes on both sides of the dam ensure stability. To prevent the water behind the dam percolating too quickly, it helps to put adjustable sheets filled with small size gravel on the upstream side of the dam body (helps in cases of drought).

====Water extraction====

* Water that infiltrates is used as soil moisture for crops cultivated after a rainfall event.

* In Balochistan, Pakistan, pipes have been added on top of the 2nd and 4th steps which discharge surplus water downstream.

* Water can be used via shallow wells and boreholes in the area.

==Costs==

Winona

Akvopedia-spade, akvouser, bureaucrat, emailconfirmed, staff, susana-working-group-1, susana-working-group-10, susana-working-group-11, susana-working-group-12, susana-working-group-2, susana-working-group-3, susana-working-group-4, susana-working-group-5, susana-working-group-6, susana-working-group-7, susana-working-group-8, susana-working-group-9, susana-working-group-susana-member, administrator, widget editor

30,949

edits