First of all, the reservoir's location far upstream on the Kuantien River posed difficulties. More than 1,200 meters long and 66 meters high, its dam required 5 million cubic meters of sand. A dam of this size was unprecedented in Asia, and the Japanese had no experience with the semi-hydraulic fill method used to build it. The only place you could find previous examples of construction by this method was in America.
首先是工程困難度極高，因大壩位於官田溪上游，高 66 公尺、長 1,200 多公尺，需使用 500 萬立方公尺的砂石，在當時可說是全亞洲前所未見的超級巨壩，而施工採用的「半水力填築式工法」日本國內並無經驗，全世界只有美國有類似的先例。