Hydrologic Modelling of Extreme Flood on Small Mountainous Watersheds

by D. Devred, Swiss Federal Inst of Technology, Lausanne, Switzerland,
D. B?rod, Swiss Federal Inst of Technology, Lausanne, Switzerland,
A. Musy, Swiss Federal Inst of Technology, Lausanne, Switzerland,

Document Type: Proceeding Paper

Part of: Engineering Hydrology


Statistical and deterministic methods for extreme flood estimation were applied to Swiss alpine catchments to assess the application limits of each approach. Comparative results produced the following conclusions: Statistical methods can not provide realistic extreme flood estimates but give precious information about rare floods. The gradex method can be used for relatively impervious basins where the marginal runoff coefficient is rapidly obtained from 10 to 50 year return period events. The use of deterministic PMF methods in Swiss alpine regions needs to be improved with close consideration of the catchment's physical characteristics. Subsequently, geomorphologic approach and Kinematic wave offer a good level of improvement. Calibration of the GKW method could be used as a new tool to evaluate the hydrologic response of ungauged catchments.

Subject Headings: Floods | Hydrologic models | Kinematic waves | Watersheds | Statistics | Mathematical models | Catchments

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