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Proposed 2020 Stormwater Management Manual. Learn more about the changes · SWMM and PAC Information Session Question Summary · Summary of Proposed Changes infrastructure design manuals that transportation designers can use. study evaluating street trees in Portland, Oregon, found that.City of Portland Stormwater Management Manual—August 2016 Management Manual, write to: BESSTormManual@portlandoregon.gov. Management Manual. Page 2. Environmental Services l 2016 SWMM Minor changes to Portland City Code 17.38 to authorizing implementation. CITY OF PORTLAND ENVIRONMENTAL SERVICES. 3. Introduction instructions and look up the soil's “Hydrologic Stormwater Management Manual has a simpli-. The Stormwater Management Manual is available at portlandonline.com/bes. Page 4. STORMWATER SOLUTIONS HANDBOOK - Environmental Services - City of Portland Code, Rules and Manuals, Environmental Services at City of Portland Plan review for compliance with BES's Stormwater Management Manual (SWMM) for major The Stormwater Management Manual (SWMM) provides policy and design requirements for stormwater management throughout the City of Portland. The requirements in Stormwater Management Manual. portlandoregon.gov/bes/64040. City of Portland, Oregon. 2016. O&M Plans by Facility Type, Environmental Services,. Excerpt from Portland Stormwater Management Manual For public easements or stormwater tracts, BES maintains the public stormwater facility following