Optimization of surge irrigation system based on irrigation and furrow geometric variables using SIRMOD model

The purpose of this research was to analyze surge irrigation system performance and optimize the design and management parameters. In this order, by creating furrows with a length of 80 m and 1.1% slope and implementing four treatments of surge irrigation in two inflow rates of 0.6 and 0.8 lit/s and two cycle times of 40 and 50 minutes, different water and soil parameters were collected and SIRMOD (surface irrigation model) was calibrated and evaluated. Then, the iso-performance contour plots of irrigation system were obtained to optimize cutoff time and inflow rate under maximizing of application efficiency, distribution uniformity and requirement efficiency. The results indicated that in the experimented furrows with the texture of sandy loam, by providing requirement efficiency of 100%, in inflow rate of 1.2 lit/s and cutoff time of 170 min, distribution uniformity and application efficiency will be 84% and 60% respectively. According to the results, by providing requirement efficiency of 100% and considering the best length of the furrow in different inflow rates, application efficiency increases up to maximum 65%. But if the requirement efficiency of 90% to be considered, at different inflow rates in certain length of furrow, there is possibility of achieving to application efficiency up to 90%