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Irrigation - Spate

175 bytes added, 19:40, 25 July 2012

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Wadi catchments generally have sparse vegetation cover, and thin rocky soils. Soils are exposed to raindrop impact and soil crusting, which results in a low infiltration capacity. Storm rainfall generates local overland flow, which converges into wadi channel networks, generating spate flood run off events. Runoff generation is usually localised, reflecting the size of convective rainfall cells that generate run off events.

 {{procontable | proborder="1" cellpadding="5" cellspacing="0" align="center"|-! width="50%" style="background:#efefef;" | Advantages! style="background:#ffdead;" | Disadvantages|-| valign="top" | - Large systems can be constructed manually with local materials and small civil works. <br>

- Control over floodwater and sedimentation reduces flooding and gullying downstream. <br>

| convalign= "top" | - Spate irrigation and pond farming systems are risk-prone, due to the unpredictable floods and frequent changes in the riverbeds from where water is diverted. <br>

- Spate irrigation is simply a method of using water optimally. It does not control the supply of water or prevent shortage of water, which can cause big income fluctuations <br>

|}} 

==Construction, operations and maintenance==

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