OPERATION METHOD OF BUFFER POND AND DIVERSION GATE FOR WATER SAVING IN PADDY IRRIGATION AREA

Abstract

 In a combined channel system where the upstream part of the irrigation canal is an open channel and the downstream part is a pipeline, a buffer pond must be installed at the contact point between the two. In order to effectively utilize the buffer pond, it is necessary to improve the water storage monitoring and the water supply operation according to the water use by the consumers.Therefore, in this study, we presented a method to prevent: surplus water when the water demand is low; and capacity shortage when the demand is high by predicting water usage, operating a water diversion control gate, and adjusting the inflow into the pond. For the prediction of water usage, we used an autoregressive(AR) model which can usefully predict future values of time series even with a limited number of data. Considering the operation rules of water usage from past data, we introduced them into the AR model. Simulation results showed that the surplus water and the water shortage of the buffer pond can be reduced by sending water according to the amount of water used.