Abstract
The Geomorphologic Instantaneous Unit Hydrograph watershed modeling approach is extended to account for subsurface runoff. Watershed response to rainfall is modelled as a Markov process whose parameters can be related to physical watershed characteristics. Time-varying instantaneous unit hydrographs are subsequently derived and convoluted with antecedent rainfall intensities to generate total streamflow discharges. This watershed model was applied to simulate the Little River Watershed in southeast Georgia. Predicted streamflows were found to be in good agreement with streamgage measurements.
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