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



Flood Irrigation

Surface irrigation the most common form of irrigationt hroughout the world that has been practiced in many areas virtually unchanged for thousands of yearsincludes a group of application techniques.Surface irrigation comes in three major types: level basin, furrow and border strip.

 

In surface irrigation, also termed as flood irrigation, water is applied and distributed over the soil surface by gravity,implying that the water distribution is uncontrolled. The average depth of water that can be delivered on field cannot be less than 75-100 mm. The total crop requirement per rotation would be 75-100 mm plus the water lost due to deep percolation. The process of surface irrigation can be said to include four phases: advance phase; storage phase; depletion phase; and recession phase. If there is long duration between two rotations, there is likelihood of water stress resulting in wilting point during the recession stage. Large difference in water that crops require and the flow irrigation system actually delivers results in low field water application efficiency.

 

Surface irrigation is often associated with undermining productivity and environmental sustainability. Over-irrigation may cause water to move below the root zone resulting in rising water tables. In regions with naturally occurring saline soil layers or saline aquifers, these rising water tables may bring salt up into the root zone leading to problems of salinity.Waterlogging can cause the plant to shut down delaying further growth until sufficient water drains from the rootzone.

 

Canal management rotation period, i.e., frequency of irrigation cannot be changed frequently during crop season to match with total crop requirement during each rotation from sowing to maturity. Further different crops grown in the command have different sowing time, crop duration and daily water requirement. All these constraints preclude evolving a tailor made water delivery schedule.These limitations

 

Many management practices, under the right conditions, can be followed to obviate some of the negative aspects of flow irrigation.Some of the practices grouped under this name involve a significant degree of management (for example surge irrigation). Water applied in each rotation can be controlled if the field are levelled precisely using laser techniques.

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Dictionary - Flood Irrigation Terms

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