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Study on Urban Catchment Delineation Based on Improved RIDEM

Abstract— The catchment delineation from DEM is a prerequisite for calculation of urban rainfall runoff and con-centration. Direct delineation watersheds from traditional method in urban result in significant departures from reality. An improved watershed algorithm based on Rural Infrastructure Digital Elevation Model was proposed, for the problems traditional methods encountered. This method took rainwater grates and drainage pipes as inlets to delineate watersheds by integrating factors (i.e. roads, buildings and rivers) which affected rainfall runoff into DEM, and a case study was carried out in a selected area of Kunming. The predicted time series match well with the monitored, which can provide more reliable predictions for Storm Water Management Model (SWMM). The results prove that the result accuracy is better than existing methods. The results can provide valuable reference for planning, design and optimized analysis of rainwater pipe network.

Index Terms— digital elevation model, rain grate, catchments basin, rural infrastructure digital elevation model, storm water management modle1.

Ya Ban, Haiyan Sun, Taili Wan, Lan Ma
School of Geodesy and Geomatics, Wuhan University, CHINA
Hongying Liu
Jiulongpo District, Chongqing Administration of Work Safety, CHINA

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Cite: Ya Ban, Haiyan Sun, Taili Wan, Lan Ma,Hongying Liu, "Study on Urban Catchment Delineation Based on Improved RIDEM," Proceedings of 2016 6th International Workshop on Computer Science and Engineering, pp. 28-33, Tokyo, 17-19 June, 2016.