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Straightforward furrow irrigation can be 70% efficient

Design and operation of furrow irrigation often focus on finding an optimum combination of the length, the flow rate, and the cut‐off time. In this paper, we analyse various combinations of these three variables using the Furdev program. To express the hydraulic performance of furrow irrigation, we use the standard application efficiency, the surface run‐off ratio, and the deep percolation ratio. The paper investigates three cases: first, we discuss the optimum flow rate for a given length, then the optimum length for a given flow rate, and, finally, we establish a relationship between flow rate and length. In the analyses, wide ranges of soils, lengths, and flow rates are covered.