Lien Hung-te measured the productivity of his fields, comparing those irrigated with water from the Lele to those irrigated with water from the Chingshui. In one crop, a hectare of the fields watered with the Lele's water could produce as much as 10,000 Taiwanese pounds of rice. Fields irrigated with water from the Chingshui, on the other hand, could only produce 6-7,000 Taiwanese pounds in the same area.
土生土長的連洪德曾計算過自家水田產量，「引樂樂溪水灌溉，平均一期稻作一公頃生產量最高可達一萬台斤，吃清水溪的稻作，同樣面積只有六、七千台斤的收成。」