WBNM — a computer software package for flood hydrograph studies

The flood hydrograph model WBNM calculates flood runoff from rainfall hyetographs. It divides the catchment into subcatchments, thus allowing hydrographs to be calculated at various points within the catchment, and spatial variability of rainfall and rainfall losses to be modelled. It separates overland flow routing from channel routing, thus allowing changes to either or both of these processes, for example in urbanising catchments. The computer program for WBNM contains many useful features for flood studies, including built in design storms, runoff from impervious and pervious catchment surfaces, flood routing through storage reservoirs, built in culvert and weir hydraulics, and diversion of surcharging flows. The program is menu driven and designed to satisfy quality assurance requirements. Full graphics displays are included.