| dc.description.abstract | Agricultural water demand in Taiwan accounts for about 70% of the total nation’s water consumption. First, this study explored the water requirements, effective rainfall and drainage of the first crop by analyzing the results of related literature in Taoyuan, Changhua and Chianan regions. Second, the irrigation plan of Taoyuan, Changhua and Chianan Management Offices, explored the water requirement and irrigation water consumption, and estimated the rate of conveyance loss were analyzed. Third, the actual water consumption of Taoyuan, Changhua and Chianan region were compared, and the relationship between actual water consumption and rainfall in each management region was explored. Finally, this study analyzed water requirement, irrigation water consumption and the rate of conveyance loss between Taoyuan and Shimen region, as well as that between Changhua and Yunlin region.
The crop water requirement estimated with the use of a system dynamic model is about 1 meter. According to the irrigation plan, the water requirements of Taoyuan region, Changhua region and Chianan region are 1.05, 1.77, and 1.04 meter, respectively. Furthermore, the loss rates of the Changhua region and Yunlin region are 36% and 50%, respectively, which are higher than that of Taoyuan, Shimen and Chianan region. River irrigated field is not like reservoir irrigated field where surplus water can be stored. Therefore, it is suggested that when the river is in high flow periods, without affecting the domestic and industry water use, limit the irrigation water consumption should be encouraged. Doing so, the extraction of groundwater for agriculture can be reduced, and the excess irrigation water can recharge the groundwater. | en_US |