CALIBRATION PROCEDURES FOR RATIONAL AND USSCS DESIGN FLOOD METHODS

This paper highlights two widely used flood estimation models--the rational method and the United States Soil Conservation Service method--and describes derivation of parameter values for each model. Flood and rainfall data from 105 small agricultural catchments in southeast Queensland, Australia, provide design values. These values are obtained by reversing the way the models are used in design flood estimation, employing frequency analyses of rainfall and flood data. Derived values are significantly different than traditional handbook values--the latter gave inaccurate estimates of design runoff and flood peaks. Observed data are only weakly correlated to catchment characteristics, such as land use and soil type, but are regionally consistent. Average recurrence interval and the method of estimating design rainfall duration impact the derived values to a greater degree.

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  • English

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  • Accession Number: 00672333
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 17 1995 12:00AM