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

Purple Roof layer depths

Depths are in inches (product units). The server converts to millimetres for the LPS SWMM model. Display units on this page do not change the INP.

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).