Author(s): Z. M. Graszkiewicz; R. E. Murphy; P. I. Hill; R. J. Nathan
Linked Author(s):
Keywords: Baseflow; Design flood hydrology; Lyne-Hollick
Abstract: Relatively little guidance exists on the estimation of the contribution of baseflow to flood hydrographs calculated from rainfall for Australian catchments. Project 7 of the Australian Rainfall and Runoff update is aimed at providing advice on the estimation of baseflow in design flood events for incorporation in the ARR guidelines. Given that the distinction between flow from groundwater aquifers (baseflow) and surface runoff (quickflow) is not definitive or easily calculated, a significant number of approaches to the calculation of baseflow exist including physically based methods and rapid assessment techniques. Most of these approaches have been developed for use on a daily time step, and are of limited suitability for flood studies. This paper gives a summary of baseflow separation theory, presents the conclusions from an investigative application of various methods for a range of Australian catchments and describes an adjusted version of the Lyne-Hollick algorithm method applicable to hourly data. The method is designed for automated application and aids the analysis of event-based baseflow characteristics for use in design flood hydrographs.
Year: 2011