The comparison of erosion of meandering and standard furrow irrigation under different field slopes

The Gholam-gardeshi irrigation (meandering furrow irrigation) is a modified form of standard furrow irrigation, which to date, there is no study about the effects of slopes on erosion of this method of irrigation. To measure the erosion of this method of irrigation and to compare the results with standard furrow irrigation, two experimental fields with different soil textures and field slopes were used to collect data such as furrow inflow hydrograph, furrow outflow hydrograph, advance and erosion. The experiment was laid out with a randomized factorial design with three replications. In both methods, the developed second order polynomial equation for the erosion, and advance equation were able to interpolate the field data with coefficient of determination of more than 94 %. The results showed that the velocity of advance, runoff and erosion are lower significantly at 5% probability level for the meandering furrow irrigation as compared to the standard furrow irrigation. As the slope of the field increased, erosion and runoff in both irrigation methods increased significantly.