Abstract
The calculation of average slope drop is one of the important parameters of design flood calculation in engineering hydrology. Conventional calculation of average slope drop of river course is usually carried out by using CAD topographic map. The river length is divided section by section and the elevation of starting point is determined, and then the average slope drop of river course can only be calculated by single river course, which has low efficiency and great artificial influence. On the basis of the river basin DEM (digital elevation model), the elements and tools needed in the calculation are connected in turn in the ArcGIS, and the calculation program of the average slope drop of the river is run according to the specified process, and the calculation results are obtained successfully. By comparing the typical river calculation examples with the data of Zhejiang River Manual, it is shown that the average slope drop calculation model constructed by the Model Builder can realize the rapid calculation of the longitudinal slope drop of the river and ensure the calculation accuracy.
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