A simple method for estimating RORB model parameters for ungauged rural catchments

M Pearse, P Jordan, Y Collins - Hydrology and Water …, 2002 - search.informit.org
M Pearse, P Jordan, Y Collins
Hydrology and Water Resources Symposium (27th: 2002: Melbourne, Vic.), 2002search.informit.org
The RORB rainfall runoff routing model is widely used for estimating design flood
hydrographs for catchments; both gauged and ungauged. A number of methods have been
developed in the literature for estimating the two routing parameters of the RORB model, kc
and m. Many of these methods have been developed using models from a limited number of
catchments and have large uncertainties in the standard error of the parameter values. The
regional method developed by the CRC for Catchment Hydrology has a much lower …
The RORB rainfall runoff routing model is widely used for estimating design flood hydrographs for catchments; both gauged and ungauged. A number of methods have been developed in the literature for estimating the two routing parameters of the RORB model, kc and m. Many of these methods have been developed using models from a limited number of catchments and have large uncertainties in the standard error of the parameter values. The regional method developed by the CRC for Catchment Hydrology has a much lower standard error of the kc estimate. However, this method is difficult to apply in practice because classification of a particular catchment is often ambiguous. This paper proposes a simple method for estimating the RORB model parameter kc for ungauged catchments that overcomes difficulties imposed in classifying the catchment to a particular group. Data from three published analyses of gauged catchments located in Australia has been re-analysed along with some additional data to provide a simple relationship between the RORB model parameters and the weighted average flow distance to the catchment outlet, dav.
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