Investigation of the Irrigation Water Requirement of Touliu Canal in Taiwan.

The purpose of this study is to investigate the irrigation water demand of Touliu canal in Taiwan and develop its the strategies of irrigation water allocation. In this study, the ILRI model is used to investigate the water demand during the growth of the rice crops and the K parameter method is used for the analysis of the water allocation model. The results show that the annual saving water is about 32.95 and 45.96 million tons during the second irrigation period of the rice crops in the primary and extended Douliou irrigation system, respectively. The results of conjunctive use of ChoKanHsien and Douliou systems showed that the water supply of ChoKanHsien irrigation system is sufficient and the excess water quantities could be provided for the use of Douliou irrigation system. Although the ChoKanHsien system can supply the water quantities of 1.24 cms to Douliou system in mid-July, but there were 2.16 cms lack needed to be filled up.