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 established, and then the corresponding flow rate of the given water level is determined according to the determined equation)