NetSTORM

NetSTORM is CDM Smith's freely distributed toolkit for the statistical side of stormwater practice: precipitation intensity-duration-frequency analysis from gauge records, time-series aggregation and synthetic disaggregation, automated acquisition of US National Weather Service data, and calibration statistics for SWMM and InfoWorks models.

Its simulation core extends the venerable USACE STORM methodology — fast continuous storage-treatment-overflow screening with multiple control structures — which has kept it in service on CSO, SSO and pump-station planning studies worldwide, and made it the analytical basis for the detention sizing guidance in the California Stormwater BMP Handbooks. Not a hydraulic model; the point is decades-long continuous screening and rainfall statistics at almost zero setup cost.