🌊 Spring River Flood Lab: Snowmelt, Curve-Number Runoff, Manning Stage and a Levee

Melt a snowpack, drop a spring storm on it and follow the water from catchment to river to floodplain. Compare scenarios with and without a levee, track houses flooded and evacuation lead time, and check the hydrology against hand calculations.

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install