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Water Portal / Rainwater Harvesting / Groundwater recharge / Infiltration ponds

No change in size, 19:10, 28 March 2012

→‎Construction, operations and maintenance

==Construction, operations and maintenance==

[[Image:InfiltrationPond.gif|thumb|right|~~300px~~400px| Cross section diagram of a SUDS infiltration basin Source: Environment Agency (2006)]]

The main issue is to minimize silting, as this will reduce infiltration capacity through the base and sides. There are several techniques to minimize this:

* Any diversion and intake structures should be made so as to minimize input of silt to the ponds. Sedimentation basins can reduce silt load before water enters infiltration pond. What might work better is to keep a good cover of indigenous grasses in the run-off area. Kambiti Farm in Kitui District provides a good example of previously degraded land being managed and where open dams did not silt up due to pasture management. Contour lines with trees or grasses in the runoff area also work. If the inflow channel is defined, silt traps can be tried out to reduce silt load as is done with Charco dams in Tanzania. In this case, stones laid across the channel form mini dams and perennial vegetation can be grown between these mini dams to reduce the flow velocity of water, thereby encouraging silt deposits.

Winona

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