Purple Roof Simulator
Sempergreen USA — TR-20 routing and SWMM continuous analysis with Open-Meteo ERA5-Land climate.
TR-20 design tool
Hydrologic routing, design storms, and Purple Roof profile export (.hcp).
Open simulator →Site planner (TR-20)
Four surface types, combined hydrograph, and optional Purple Roof detention on the treated roof leg.
Open site planner →SWMM dashboard
Multi-year LID performance with hourly precipitation and temperature from Open-Meteo.
Open SWMM dashboard →Stormwater site context (SSURGO)
USA map: USDA SSURGO soils at a point.
Open SSURGO explorer →FAQ
How the TR-20 tools, site planner, and SWMM dashboard fit your workflow.
Open FAQ →