Inflow rate AMD cutoff ratio for irrigation in nearly level border strips

Abstract

The experiment was done to study the hydraulics, of border strip irrigation in nearly level lands, during 1982. The study revealed that the discharge rate of 2 l/s/m and the inflow cutoff length of 77 per cent of the strip length are optimum for uniform distribution of water for the following reasons: 1) The depth of irrigation could be limited to 5cm even in soils having high rate of infiltration; 2) The lower discharge rate of 2 l/s/m reduced the time of ponding at the downstream end and this minimised the wastage due to deep percolation at the downstream end; 3) Soil erosion was minimum at this rate of discharge; 4) Long strips upto 45 m length in loamy sand could be irrigated with high degrees of efficiency; and 5) As only a low rate of discharge was required to practise this method, even in areas having limited availability of water an additional crop could profitability be raised.