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Western Washington Hydrology Model (WWHM) dataset includes released versions of the hydrology software. The dataset contains installation files, change descriptions, dates, and version numbers. It is hosted on data.wa.gov and was last updated on May 13, 2026.
WWHM2012 is noted as the official program for MS4 permit compliance, while WWHM2025 is a test/beta version.
| # | Column Name |
|---|---|
| 1 | Release Date |
| 2 | Version Number |
| 3 | Maps |
| 4 | Notes |
| 5 | File |
| 6 | Guidance |