Estimation of runoff volumes for ungauged catchments in the agricultural areas of Western Australia
1987
Davies, J.R. (Western Australian Dept. of Agriculture, Perth. Salinity and Hydrology Research Branch) | McFarlane, D.J. (Western Australian Dept. of Agriculture, Perth. Soil Conservation Branch)
Describes an analysis of flood runoff volumes from 16 small, gauged catchments in the agricultural areas of south western Australia. It also describes methods for estimating flood runoff volumes from ungauged catchments. The independent variables found to be statistically significant in explaining the variability in flood runoff volumes from the gauged catchments were catchment area, mean annual rainfall and the percentage of the catchment that was cleared. Predictive equations were chosen if they explained a significant amount of variance, contained realistic variables and passed near to the origin. No soil factor was found to be significant. This may be due to soil types not being a significant factor during flood events or more likely, to the use of a poorly defined soil variable (estimated percent clay in the topsoil). A major recommendation in this report is for soil factors affecting flood runoff to be better defined for the gauged catchments.
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