The term bioretention is used to describe various designs using soil and plant complexes to manage stormwater. The following on-site stormwater management BMPs are commonly used in the right-of-way: Bioretention Infiltrating and Non-Infiltrating Facilities It is the responsibility of a project engineer to modify the design guidance details provided to address local conditions. The information provided in this section is intended to provide applicants with design guidance that has undergone review from the various City departments involved in Street Improvement Permitting. It is sometimes challenging to construct surface stormwater elements while meeting the multiple needs within the City’s right-of-way, including addressing public safety and public mobility needs. All projects that meet the minimum threshold requirements identified in Stormwater Seattle Municipal Code: 22.807.020 – Drainage Control Review and Application Requirements and Stormwater Manual: Volume 1 – Project Minimum Requirements should reference Appendix C of the Stormwater Manual for the On-Site Stormwater List BMP Infeasibility Criteria, to determine which BMP’s are allowable/suitable for the site. Full right-of-way improvements include revisions to the full right-of-way envelope including the public sidewalk, adjacent planting strips and roadway. On-site stormwater management best management practices (BMPs) can be used as part of partial or full street right-of-way improvements. Partial street improvements include improvements to the public sidewalk and planting strip and/or portions of the roadway. Bioretention with Vertical Side Wall(s).

Bioretention Infiltrating and Non-Infiltrating Facilities.

4.8 Other Street Right-of-Way Improvement Activities.

Street and Sidewalk Right of Way Opening and Restoration Rule.

Excavation, Shoring, and Safety Systems During Construction.

Demolition and Grading During Construction.

Construction Inspection and Testing Procedures.

4.3 County, State and Federal Permits and Approvals.

4.2 City of Seattle Environmental Review and Approvals.

Neighborhood Greenways and Trail/Shared Use Path Crossings.

1.4 Departmental Roles and Responsibilities.

1.3 Other Policy Standards and Guidelines.

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