International Commission on Irrigation & Drainage Commission Interationale des Irrigation et du Drainage



(4653) Flush irrigation
A method of surface irrigation wherein the surface flooding phase predominates. The surface of the irrigated are is formed with no cross slope and a uniform slope in the direction of flow so that water flows gradually in a continuous sheet over the entire surface of the land (border strip irrigation) or over the entire length of the corrugations (corrugation irrigation) from a supply ditch or pipeline. Water may or may not be ponded at the downstream part of the border strips or corrugations which is either closed or open on an excess water discharge system called surface runoff system : surface runoff waters can be used (recycling). Surface runoff or excess ponding may be reduced by reducing the inflow at the head (called ‘cutback’ in the USA) before the water front reaches the extremity of the border strips or corrugations.

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