Mohammad Javad Monem - Assistant Professor, Tarbiat Modarres University, Tehran, Iran
Mohammad Sadegh kiapasha - M.Sc. Student Tarbiat Modarres University, Tehran, Iran

Facing water shortage and increasing water demand, it is necessary to consume limited water resource in an optimal fashion. In agricultural sector as the biggest consumer of water, due to low performance of irrigation networks improving, water delivery systems and its performance with participation of water users and applying improved control system is a must. For this purpose in recent decades several automatic control Systems including P+PR system, for flow management in irrigation networks are introduced. Applications of these techniques provide a situation that water users play a direct role in water delivery with high flexibility. After introducing any automatic control system, their application in irrigation canals, requires testing of their performance in relation with other structures. Consi dering unsteady behavior of the flow in irrigation canals, using hydrodynamic models is a regular approach for testing performance of control systems. For this purpose international test cases including two types of canals, with specific operational instructions are introduced by American Society of Civil Engineering (ASCE). In this paper ICSS hydrodynamic model is applied on ASCE standard canal no. two to test the global performance of P+PR downstream automatic control system. After calibration of numerical coefficients of control system, the operational scenarios are applied, and performance indicators such as MAE and IAE which represent maximum and average depth deviation respectively and SRT which indicates response time of control system are determined. In addition to the performance indicators, depth, Flow and gate adjustments variations are depicted and analyzed. The results show that average depth deviations are in the range of 0.001 to 0.014 % and maximum depth deviations are in the range of 0.111 to 0.211 %. The response time of control system shows that the depth is stabilized in the allowable range at the first time step. Depth variation graph shows appropriate response of control system to flow variations. Performance indicators and depth variations shows appropriate functioning of the control system. Relying on the results of this study, application of this control system in irrigation canal which provide higher flexibility and direct participation of water users in management of water delivery could be suggested.

Irrigation canals, Automatic control, Management of water delivery, P+PR, Downstream control