Purple-Roof

SWMM Continuous Simulation

Multi-Year LID Performance Analyzer
Beta / testing. This SWMM dashboard is under development. Do not use for design, permitting, or client deliverables until Sempergreen releases it.

Map

Click to place the simulation point · drag the marker to adjust

Open-Meteo climate series

Hourly precipitation and 2 m air temperature (same data fed to SWMM; engine uses SI internally).

LID system comparison

Aggregated monthly performance metrics

Customize LID layer depths

Depths use product units (inches or millimetres from the page Units control). The server converts to millimetres for the LPS SWMM model.

Purple-Roof

Retention roof

Honeycomb: not applicable

Green roof

Honeycomb: not applicable

Honeycomb is described as porosity in product terms. In SWMM, the detention layer uses a STORAGE row with void ratio, not porosity. This tool only adjusts thickness in SWMM; void ratio stays at the model default (0.98). Storage thickness sent to SWMM is 2 × (honeycomb + 0.2″) (product convention for how SWMM treats storage).