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于桥水库库前区墙截老河道入口，形成一个近９ｋｍ￣２，容积达２０００万ｍ￣３～２５００万ｍ￣３的前置库，可充分发挥其物理、生物、化学的综合作用，延长入流水在前置库区的滞留时间，降低流速，均化流场使入流水在前置库区得到净化，大量的泥沙及营养盐截留在前置库区，从而使进入主库的营养盐含量大幅度降低，抑制主库中藻类的过度繁殖，起到防治或减缓于桥水库富营养化的作用。
Yuqiao reservoir in front of the wall cut off the old river entrance, forming a nearly 9km ~ 2, the volume of 20 million m ~ 3 ~ 25 million m ~ 3 front storehouse, give full play to its physical, biological, chemical integrated role, Extend the residence time of inflow water in the pre-reservoir area, reduce the flow rate, homogenize the flow field so that the inflow water is purified in the pre-storage area, a large amount of sediment and nutrients are retained in the pre-storage area, Significantly reduce the nutrient content, inhibit the main reservoir of algae over-breeding, play a preventive or slow down the eutrophication of the bridge reservoir.