Extraction the curves command of Bukan and Mahabad dam reservoir using PSO algorithm

In this study, PSO optimization algorithm was used to extract curves command of two Bukan and Mahabad dam reservoirs. The purpose was supplying of water need for drinking, agriculture and environment during specified period. Two linear and non-linear quadratic equations were used in the implementation of the PSO algorithm to explain behavior of two dams. The best answer was achieved from eighth implementation with 10 particles and 15,000 iterations for Bokan dam from linear 1 degree model with minimum value of target function 138.4 and also as an optimal model for Mahabad Dam in the third run with 10 particles and 70,000 iterations and applying a non-linear 2 degree model with 749.7 value of target function. The results showed that total long-term average inflow was 1506 and 269.3 million cubic meters during the wet and dry periods for Bukan and Mahabad reservoir, respectively. However, water shortages were 17.8, 45.48, 65.0, 51.9, 51.9, 50.24, 36.95, 67.35, 68.05 and 60.65, in agriculture and environment sections in Bokan dam at dry periods during October and September, respectively. Also, water shortages was 44.08 and 55.2 in Mahabad dam in October and November, and 26.22, 18.25, 19.24, 20.79, 24.92 and 14.86 % of in April and September. Thus the release of water was complete for drinking purposes in the dry and normal years and was less than required for agriculture and the environment purposes. Also maximum deficit was 57 and 40 % in July and October for Bukan and Mahabad, respectively. Overall it can be said That, part of the shortage of agriculture and environment caused by the lack of inflow to the lake of the dams and partly is due to completely supply drinking needs. While all sectors in all months have had enough of the water in wet year due to the high inflow into the lake of the dams.