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February 2021 - BES 2020 Stormwater Management Manual (SWMM)

2021-02-26 23:56:18| PortlandOnline

The City of Portland 2020 Stormwater Management Manual (SWMM) became effective Dec. 14, 2020. Until April 6, 2021, project designers can use either the 2016 SWMM or the 2020 SWMM. Starting April 7, 2021, all projects must meet 2020 SWMM requirements. Mor

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