From Mountains
to Streamflow

What a DEM is, D8 steepest-descent routing, flow accumulation, and pit filling.

Automatically extract catchment boundaries and stream networks from any DEM.

The Variable Source Area model, Green-Ampt infiltration, impervious shedding, and the satellite pipeline that derives every parameter.

The shallow-water equations simplified: route floods through a river network.

Where kinematic wave fails, the GSSHA-style conveyance depth in OPM’s real code, and what one global timestep costs on flat terrain.