Designing anD evaluation Control system of the Dez main Canal CONCEPTION ET SYSTEME DE COMMANDE DE L'EVALUATION DU CANAL PRINCIPAL DE DEZ

In the present study, a water level local upstream PI feedback controller was applied for the west main canal of Dez irrigation system in Iran. Total length of the proposed canal is 93km, in which the first 45km of the canal are considered. The canal has a design discharge capacity 157 m 3 s -1 at its head. There are 14 ‘in-line’ check and 71 offtake structures, and 15 cross-structures along the length of the canal. The model of the proposed canal was formulated in the SOBEK simulation package. The control system was also programmed in MATLAB. To evaluate the control system potential, simulations were done for three months of the real offtakes schedule. The flow control time step and feedback control time were considered both 5 minutes. The performance criteria of the maximum absolute error (MAE), the integral of absolute magnitude of error (IAE), and the steady state error (StE) were determined. The results indicated that the applied control system has considerable potential to closely match the discharge at the downstream check structures with those ordered by water users while maintaining the water level throughout the length of the canal.