This office uses the natural flow of the Zhuokou River, Ailiao River, Gaoping River, Wuluo River, Donggang River, Linbian River, Fenggang River, and Sichong River as its main water source. The water intake of each town is unstable and there are partial water shortages during the dry season from January to May. Accordingly, there are 865 water wells, 867 deep and shallow well pumps of various types, and 17 surface water pumps, with a total of 11,882 horsepower are installed downstream of the irrigation area to supplement the lack of surface water.

The terrain of the area managed by the office is flat and surrounded by mountains and rivers. To the east is the southern section of the Central Mountains, which rise and fall endlessly as they extend toward the plain and serves as a barrier for the entire area. To the west is a fertile field and flat area, which connects to Gaoping River Basin at the county boundary, forming a sloping landmass on its own, with mountains and flat land separated by a line that runs from north to south along the Chaozhou fault zone. It starts from the flat land of Ligang and Jiuru in the north and stretches to the coast and Donggang, Linbian and Fangliao in the south, starting from Gaoping River in the west and ending at a flat area where bananas are planted in the east. The area is commonly known as the Pingtung Plain area and is formed by an alluvial network of rivers; Gaoping River, Qishan River, Lanong River, Ailiao Township and Linbian River. The geology is mainly gravel, sandy and clay soil, which is suitable for agricultural development.

This department currently has 203 irrigation working groups, 1,089 units, and 64,182 members.

This takes place in line with government policies on effectively utilizing water and soil resources and developing quality agriculture. The office is committed to providing guidance to farmers on dry land irrigation terminal spraying facilities, to resolve the difficulties of dry land irrigation. The office also provided guidance for and promoted pipeline irrigation for 14 years, benefiting 397 farmers with a facility area of 242 hectares. The engineering project cost NT$8,990,000 and by the end of 2005 had provided guidance and promoted pipeline irrigation, benefiting 3,156 farmers, with an installation area of 2,252 hectares for an engineering project cost of NT$119,390,000.

In 2013, a total of 465 farmers were subsidized, with a total extended area of 480 hectares and a total subsidy of about NT$18 million, with impressive results.