This documentation provides a comprehensive framework for flood estimation in Australia, serving as an updated technical guide for engineers and town planners. It details the hydrologic processes that convert rainfall into runoff, such as infiltration, baseflow, and routing, while accounting for the significant impact of climate change on modern data sets. The text outlines various simulation techniques, ranging from simple event-based methods to complex Monte Carlo simulations that handle multiple stochastic variables. Special emphasis is placed on joint probability, exploring how different factors like storm surge and soil moisture interact to influence flood severity. Ultimately, these guidelines aim to support infrast ...