Distinguished by irrigation water source , water balance calculation of every irrigation area is carried on respectively in low flow year ( P =90%) . The relationship of each irrigation area on between water supply quantity and water requirement is discussed, providing approval basis for supplement auxiliary project and water saving rebuilding in Shuijing reservoir irrigation district.%按灌溉水源进行区分，分别进行各灌溉片区P＝90％枯水年的水量平衡计算，论述各灌溉片区供水量与需水量的关系，为水迳水库灌区续建配套与节水改造工程的审批提供依据。
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