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Environmental Services

working for clean rivers

Phone: 503-823-7740

Fax: 503-823-6995

1120 SW 5th Avenue, Room 1000, Portland, OR 97204

Stormwater Management Manual Revision

The Stormwater System Program recently completed a revision Stormwater Management Manual (SWMM). A summary of the key updates in the 2014 SWMM revision include:

  • New submission requirements for Manufactured Stormwater Treatment Technologies, including a new application fee
  • Changes to reflect current regulatory standards, city code changes and administrative rules

Future revision priorities currently include:

  • Revising the manual to provide a systems based approach and approvable route of conveyance
  • Updating the Offsite Management Fee methodology
  • Separating the administrative rules (requirements and policies) from the design guidelines
  • Update facility designs and details as current practices and policies evolve (such as Street by Street)

Stakeholder engagement will soon begin on scoping the next SWMM revision, which will help determine any additional priorities.