Study on leveling system of hydrological network for area of Lake Nansihu

In recent years,some unreasonable phenomena occur from all the hydrological stations of Lake Nansihu during its water dispatching,which impact both the analysis and calculation made on the flood within the area of the lake and the decision-making made on the relevant water dispatching therein directly.In order to find out the causations of these phenomena,a survey is made on the leveling system for the lake area,and then the results from the survey are analyzed and studied in accordance with the specifications concerned.Therefore,the conclusions on the variations of all the elevation systems for all the hydrological stations within the lake area are obtained for laying a basis for revisions of the datum levels of all the stations therein.