Abstract
In irrigation system with an open channel, water supply-oriented control is generally applied to adjust the difference between water demand and its supply. Though the water supplyoriented control is necessary in the peak demand season, the demand-oriented control is able to be applied in other seasons because the system has ample capacity to convey the required water. In this paper, it is made clear that the absorbability can be evaluated by the averaging time of the system, and then on the viewpoint to average the water demand fluctuation occurring due to water consumption, how to determine the storage capacity for regulation and how to design canal system are discussed.
