Regionalisation of Rainfall Duration in Victoria for Design Flood Estimation Using Monte Carlo Simulation

Design flood estimation is often required in hydrologic practice such as design of hydraulic structures and flood plain management. In flood estimation, use of rainfall runoff models is frequently adopted which convert selected rainfall events into the corresponding streamflow events. In Australia, runoff routing model is frequently adopted as the preferred method of rainfall runoff modeling. The national guideline for design flood estimation known as Australian Rainfall and Runoff (ARR) recommends Design Event Approach for adoption with the runoff routing models. The Design Event Approach considers the probabilistic nature of rainfall intensity but largely ignores the probabilistic behavior of other input variables in the rainfall runoff modeling such as rainfall temporal pattern and initial loss.