the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Technical note on incorporating natural variability in master recession curves
Abstract. In this technical note, we hypothesise that the master recession curve (MRC) is a continuum rather than a single average curve and the natural variability as evidenced in the range of MRCs represents aleatory uncertainty across the continuum and is the result of antecedent hydroclimatic conditions and heterogenous storage conditions in the unconfined aquifer/s feeding the streamflow. For four streams, representing the range of Australian hydrology, master recession curves were computed for five aleatory conditions (90, 75, 50, 25 and 10 percentiles) using the correlation technique. Observed recessions were superimposed on the plots confirming that the continuum of MRCs represented the observed conditions. For one stream, the Northern Arthur River (a 437 km2 in Western Australia yielding 2.7 mm runoff per year), a qualitative model based on field observations supports the continuum concept.
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