![]() ![]() Basdev, Bordev and Furdev assume uniform conditions in time and space. The user should however realize that the computer models are simplifications of the real world. The software included in SURDEV will help users to evaluate the effects of certain decisions in the design and operation of the irrigation process on the efficiencies and uniformities. Interactions between the variables determine advance time, recession time, infiltrated depths and corresponding irrigation efficiencies and uniformities. The many variables involved in these models include field dimensions, field slope, flow rate, cut-off time, soil-infiltration and flow resistance. Success of the techniques depends on a proper design and operation of surface irrigation systems at field level, to help farmers achieve good crop yields, use precious water resources more efficiently and limit waterlogging and salinization of the soil.įor decades, engineers have been developing mathematical models of the entire process of surface irrigation to improve irrigation efficiencies in the farmers’ fields. ![]() The purpose of all of these techniques is to supply water in the right quantity, at the right time and in an even layer, to achieve a uniform crop stand and minimise water losses. The most common surface irrigation techniques are level basins (with or without level furrows), sloping borders and sloping furrows to distribute irrigation water. Following the pull of gravity, the water flows over the fields from one end to the other, infiltration into the soil as it goes. Surface irrigation relies on gravity to spread water over the farmers’ fields. ![]() SURDEV consists of three software programs: BASDEV (for level basins), BORDEV (for sloping borders) and FURDEV (for graded furrows). The SURDEV computer package was developed by the International Institute for Land Reclamation and Improvement (ILRI), Wageningen Environmental Research and the Institute of Land and Water Management of the Catholic University of Leuven (ILWM), Belgium, in 2001. ![]()
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