In perennial irrigation system water required for irrigation is supplied in accordance with the crop requirement througout the crop period.
Examples of irrigation system are,Perennial irrigation (Dams)Direct irrigation (river canal irrigation)Storage irrigation (tanks and resevoirs)
need of irrigation: insufficient of rainfall uneven distribution of rainfall improvement of perennial crops. mode of irrigation: 1. Lift irrigation 2. flow irrigation
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In medicine it is the cleaning wound or body organ by flushing or washing out with water or a medicated solution. It is also the supplying dry land with water by means of ditches etc.
`Chain pump system of irrigation is a traditional method of irrigation.