A reproducible, map-oriented workflow for flood hazard assessment
that chains rainfall extreme value analysis, rainfall-runoff simulation,
terrain-based flow routing and water-depth estimation into a single
pipeline. A stationary-versus-nonstationary test for changing rainfall
extremes is built in, and any flood scenario can be produced for a
present-day or a climate-adjusted design event. Defaults target settings
with sparse gauge networks, using satellite or reanalysis rainfall,
temperature-based potential evapotranspiration and regional pooling of
short records. Heavy modelling engines are wrapped rather than
reimplemented so that the core stays lightweight. Methods follow
established hydrology, including the generalized extreme value distribution
for rainfall maxima (Coles, 2001,