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SPATE FLOW AND SEDIMENT OPTIMIZATION IN SPATE IRRIGATION DIVERSION STRUCTURES [Abstract ID: 0608-03]
The aim of this study was to evaluate alternatives in the main intake designs of spate irrigation structures. Relevant data were collected from the field and respective offices. Four scenarios were developed, based on the current problems. The Delft3D model was employed to simulate the hydrodynamic and morpho-dynamic characteristics of the flow around the main intake. The study showed that adjusting the intake deflection angle from 120 to 150 degrees for a 3-meter wide intake could increase irrigation water abstraction by 21%. Changing the intake width from 3 to 5 meters at a 120 degree deflection angle could increase total irrigation water abstraction by 81%. Adjusting the intake width from 3 to 5 meters and the deflection angle from 120 to 150 degrees could improve spate irrigation water abstraction by 101%. These interventions did not result in any significant reduction in sediment deposition at the intake. However, the enhanced supply of water through the main spate flow gates may convince farmers not to block the scour sluice gates. From a purely design point of view, an intake width of 5 meters and 150 degree deflection angle are to be recommended.