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EPA Storm Water Management Model (SWMM)

The EPA Storm Water Management Model (SWMM) is a dynamic rainfall-runoff simulation model used for single event or long-term simulation of runoff quantity and quality from primarily urban areas. It supports planning, analysis, and design related to stormwater, combined, and sanitary sewer systems, and other drainage systems. SWMM is open source, cross-platform, and widely used worldwide.
Latest: 5.2.4 GitHub
Last checked: Jun 9, 2026 12:10am
Rank: 5025/15140
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Overview

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License: Public domain / Open sourceWinget: Available

Version & Lifecycle

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Current: 5.2.4 Oldest supported: 5.1 Predicted EOL: 2025-12-31 Avg cadence: Every 1381 days

Top Contributors

Top sitewide contributors:

  1. Anbarasan
  2. nico_k
  3. Bob
  4. Vigneshwaran

Community Notes

Deployment tip • May 26, 2026
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swmm managed update note

Storm Water Management Model SWMM updates can return exit code 1618 when SWMM is open or another Windows Installer operation is still active. Close SWMM and wait for Windows Installer to become idle before retrying a managed update. Source: official swmm source.

Release Notes & Updates

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Avg cadence:
Updates • 0

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Also known as

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swmmEPA Storm Water Management Model (SWMM)epa swmm

Notes

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SWMM was first developed in 1971 and has undergone several major upgrades. SWMM 5 is FEMA-approved for National Flood Insurance Program studies. The software is freely available from EPA and supports modeling of gray and green stormwater infrastructure.