The Douliu Canal draws its irrigation water from the overflow of the Jiji Weir, a key component of the Jiji Joint Water Diversion Project. This arrangement extends the project’s reach, irrigating the region while improving the efficiency of water and soil resource utilization.

The irrigation area spans both Yunlin and Chiayi counties, benefiting approximately 6,000 hectares of farmland. The canal design integrates ecological, landscape, and cultural elements, substantially enhancing the rural landscape and environmental beauty of the area.