Guidelines for Designing and Evaluating Surface Irrigation Systems

advance phase application efficiency assumed basin border calculations changes complete Compute crop cutback cutoff cylinder deep percolation defined depletion depth described determined developed difference direction discharge distance distribution elevation equal Equation equipment estimate evaluation example farm field Figure flow flume function furrow furrow irrigation geometry grid head hydraulic hydrograph important improve infiltration infiltrometer inflow initial inlet intake opportunity irrigation system land levelling later irrigations length losses m³/min maximum measurements method minutes necessary needed noted occur operation parameters percent performance plotted pond practices problem procedure Qmax ratio readings recession reduced relationship root zone runoff selected shown slope soil moisture step structures surface irrigation surface irrigation systems t₁ Table tailwater Treq typical uniformity unit usually utilize volume water supply weir wetting width yields