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Abstract

In furrow irrigation system, distribution of uniformity along the furrow depends on the rate of advance. Higher advance rate reduces the difference in intake opportunity time between the head of the furrow and the lower end and therefore results in more uniform distribution of water along the furrow. Recently researchers have introduced surge flow for furrow irrigation. Less deep percolation, more uniform distribution of water, capability of automation and consequently higher efficiency are the advantages of surge method over conventional methods. In surge flow, irrigation water is delivered to the furrows or’ an intermittent basis rather than conventional continuous application. In this study, velocity of advance under surge and continuous flow at three different experimental sites having different soil textures and furrow hydraulic conditions, were compared. Surge flow experiments were similar to continuous flow experiments except that surge flow had cycled inflow (10 mimutes on and 10 minutes off). The results of the three experimental sites showed thatwiththe same amount of water delivered to the furrow, the velocity of advance under surge flow was higher than continuous flow