基于特定数据的建立水位流量关系的正交函数法，并依据已知数据定方程，此方程满足水文行业规定的精准度，然后根据定的方程求给定的水位对应的流量(Based on the specific data, the orthogonal function method for establishing the relation between water level and flow is established. According to the known data, the equation is es