Field Verification of Dem-Derived Watershed Response

by Randal F. Bodnar,
Mark Michelini,
Rafael G. Quimpo,

Document Type: Proceeding Paper

Part of: North American Water and Environment Congress & Destructive Water


Rainfall-runoff data from an NAEW Experimental Watershed are used to test the feasibility of deriving the watershed response from the digital elevation model of the watershed. Using Clark's method, it is shown that the instantaneous unit hydrograph and from it any finite duration unit response may be obtained and used for runoff prediction. The approach requires proper delineation of overland and channelized flow components in order to obtain an accurate estimate of the time of concentration. The methods developed in an earlier study were extended to compare actual and calculated direct runoff hydrographs (DRH). Calculated direct runoff hydrographs were then compared with field data to verif the applicability of the method. As with the previous study, in addition to programs written by the current author, existing software packages were used to process the DEM and for file conversions. Image processing was done by IDRISI, a raster based Geographic Information System (GIS).

Subject Headings: Field tests | Watersheds | Verification | Hydrographs | Channel flow | Runoff | Geographic information systems | Rainfall-runoff relationships

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