Stormwater Management Manual
The City of Portland Stormwater Management Manual (SWMM) is being updated. The SWMM enables the City to comply with regulatory requirements and protect both watershed resources and infrastructure investments with every development or improvement to achieve important citywide goals. The SWMM applies to development activities that construct or alter impervious area, as well as to those that could impact a drainageway. It applies to both work in the right-of-way and on private property. Significant technical updates include: clarifications to applicability and exemptions, clarification of the stormwater discharge hierarchy, revisions to hydrologic and hydraulic calculations and guidance, updated design detail drawings, changes to soil specifications and better alignment with the City’s Sewer and Drainage Facilities Design Manual.
Environmental Services is inviting the public to review and comment. The public comment period is planned for October 2019. During that time material will be available here: www.portlandoregon.gov/bes/2020SWMM
Sewer and Drainage Facilities Design Manual
The current edition of the BES Sewer and Drainage Facilities Design Manual is more than 10 years old. Since its publication in 2007, construction technology, pipe materials, and project planning and design methodologies have evolved. Importantly too, the expectations of manual users have changed regarding the availability of information online. As a result, Environmental Services is proposing updates to the manual that will improve clarity, formalize and update technical requirements, eliminate obsolete information, and remove any discrepancies between the SDFDM and the City’s Stormwater Management Manual (SWMM). For more information about content and schedule please visit: www.portlandoregon.gov/bes/2020SDFDM