In regard to the operational characteristics of intake water pumping stations, a double layer decomposition - coordination model was applied for optimal dispatch of the intake water pumping station. The model was developed with the minimum total operational cost for achieving the objective function. A day is divided to a certain number of independent but mutually correlative periods of time where the effect of the electricity bills in different periods of time on the operational fee of the intake water pumping stations and regulation of clear wells are taken into consideration on the optimal d...