optimization of performance measures in doroodzan irrigation network

In this research, the performance measures of water equity and productivity have been optimized in the entire doroodzan irrigation network by using genetic algorithms. results indicated that irrigation water management improvement at field scale [increasing irrigation application efficiency (ea) and water reduction fraction (wrf)] has much more impressive impact on raising the performance measures than the improvement of conveyance efficiency of channels (ec). increments of ea (40% to 90%) and ec (70% to 90%) resulted in maximum and minimum incremental effects on water equity (on average 48.2% and 17.7%, respectively) and productivity (on average 92.0% and 10%, respectively). the incremental effect of wrf (0.0 to 0.8) on water equity and productivity was on average31.4% and 10%, respectively. furthermore, the values of performance measures decreased from wet water year to drought water year. tape irrigation system was considered as the best choice at low quantities of wrf (<=0.4); however, for higher values of wrf (>=0.6), sprinkler irrigation system was considered as the best choice for achieving higher values of water equity and productivity. meanwhile, when equity and productivity were considered together for a specific method of deficit irrigation scheduling, under specified quantity of irrigation water, with increasing equity, the water productivity reduction was negligible.