As I stand on the riverbank, the structure of the underground weir becomes immediately apparent as I compare it with the cross-section diagram. (See diagram.) The steps of the weir embankment are studded with concrete pillars that stick out at an oblique angle and form a square enclosure for collecting water. The groundwater infiltrates the water corridor between the concrete pillars.
在河邊對照二峰圳的剖面圖（如圖），地下堰的構造一目了然，梯形堰體有一根根傾斜的水泥柱隔出一方集水空間，地下水就從水泥柱間滲入廊道。