The latter, drawing from Shanhu Lake and the Chuoshui River, provided water to nearly 150,000 hectares of land, much more than all the Qing Dynasty irrigation projects put together.
嘉南大圳引珊瑚潭和濁水溪水源，灌溉農地規模廣達十五萬甲，遠大於清朝開鑿的幾個圳。