In order to realize effective water distribution scientifically and to improve the water environment in river networks,the water distribution of tide-generating current is calculated according to the calibration analysis of tidal flow distribution based on the data introduced by Xiaoshan Drainage and Irrigation Stations along Qiantang River during tidal periods.

A lot of water diversion-allocation works in the river-net of the West Lake,West creek marshland,Qiantangjiang River stretch and Navigation Canal stretch in Hangzhou urban district have been built in the past 10 years,therefore,the water quality in this water system is bettered obviously.