Comparison of Tenn-V and TR-55 on TVA Watersheds

by Donald E. Overton,



Document Type: Proceeding Paper

Part of: Hydraulic Engineering

Abstract: The storm hydrograph simulation models TENN-V and TR-55 were compared as to their respective abilities to reproduce 468 storms observed on 54 watersheds. TR-55 did not represent the Tennessee Valley data with any acceptable degree of accuracy. The reasons for the inability of TR-55 to accurately represent the TVA data are that (1) TR-55 is a linear system representation whereas surface runoff response is very non-linear, (2) the shape of the underlying Unit Response Function (URF), for which surface runoff response in TR-55 is based upon, bears little resemblance to the experimentally derived URFs, and (3) lag time predicted by TR-55 not only involves considerable subjectivity in estimation but also the SCS prediction system for lag time does not vary with the causative rainfall excess.

Subject Headings: Watersheds | Comparative studies | Federal government | Rainfall-runoff relationships | Rain water | Runoff | Storms | Hydrologic models | Simulation models | Hydrographs | North America | United States | Tennessee | South Carolina

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