Irrigation water diverts water from six river systems including Lanyang River, Yilan River, Dezikou River, Dongshan River, Xincheng River and Nanao River. There are 25 weirs, 22 canal head works, and 150 canals for irrigation and drainage. The systems are categorized as an irrigation or drainage system with more than 9,000 channels and a total length of approximately 3,300km
At present, the critical irrigation facilities of the office include leading channels, main canals, lateral canals, sub-lateral canals, small and medium ditches, tunnels and drainage channels, weirs, water gates, flumes, head works, hydraulic drop structures, culverts and water measurement equipment etc.
The cropping system in the irrigation area is mainly rice fields; the cropping ratio: rice accounts for 95%, mixed crops 5%, and the irrigation area is 17,686 hectares
In response to periods of severe drought and areas with insufficient irrigation water sources, the office adopts drought irrigation operation measures of varying levels, strengthens channel management and maintenance, improves water delivery facilities, and adjusts irrigation water on a rotating basis.
Large rotating irrigation area system
Irrigation rotates in each area