The policy of trapping silt upstream in the Tahan River has also achieved little. Over 100 silt trap dams large and small have been built across the river, standing out in the landscape like slashes made with a machete. But most of them filled up as soon as they were built, and "almost the only one still functioning as a silt trap is the Junghua Dam," says Chen Hsin-hsiung.
在大漢溪上游展開的防堵政策，讓河流如被菜刀一刀刀切過般的蓋了一百多座大大小小的攔砂壩，卻隨蓋隨淹，「幾乎僅乘一座榮華壩具攔砂功能」，陳信雄說。