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City of Bellevue, WA Development Services
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  8. Storm Drainage Report

Storm Drainage Report

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    Plan Review Resources

    • Addressing Site Plan
    • Architectural Plan
    • Boundary and Topographic Survey
    • Clearing and Grading CSWPPP Requirements
    • Deferred Submittal Guidelines
    • Generator Permit Requirements
    • Home Occupation Site Sketch/Site Plan
    • Landscape Plan
    • Pool and Spa Plan
    • Project Proposal
    • Requirements for Recorded Documents
    • Residential Site Plan
    • Road Plan
    • Shoring Plan
    • Sign Permits - Building Review
    • Sign Permits - Plans and Drawings
    • State Construction Stormwater General Permit
    • Storm Drainage Report
    • Stormwater Site Plan
    • Street Lighting Plan
    • Structural Plan Requirements

    Some building and utilities permits issued by the City of Bellevue require a storm drainage report to be submitted for plan review. Prepare your report using the requirements outlined in the 2017 Surface Water Engineering Standards (SWES), Section D2 - D6. For assistance in submitting your report online, refer to Electronic Plan Requirements and Electronic Review Efficiency. For questions regarding your submittal, contact the Utilities Review desk.

    • All plan sheets must be a minimum of 18 x 24 inches. 
    • Storm drainage reports must be on 8 ½ x 11 inches and should be separate from the geotechnical report.

    Project Information

    • Project address
    • Name, address and stamp of preparer (if a licensed individual)
    • Vicinity map

    Report Requirements

    • Table of contents.
    • Utility standards and Department of Ecology codes pertinent to the project.
    • Project overview - existing and proposed conditions.
    • One quarter mile downstream analysis.
    • Off-site capacity analysis (if applicable).
    • Site Assessment and Planning Packet
    • Pre-developed and post-developed chart showing square footage of hard surfaces and pervious surfaces.
    • Figure 1.4 or 1.5 highlighting the flow path used to determine stormwater minimum requirements for the project.
    • Highlight flow path on 2017 SWES, Figure 5.1, for infiltration feasibility.
    • Details of infiltration testing, if required (test hole must be a minimum of six feet deep per 2017 SWES Appendix D-10).
    • Discussion of how each minimum requirement is being met.
    • Thorough discussion of List #1, List #2 or LID performance standard (2017 SWES D104.2(e)). Include infeasibility criteria per 2017 SWES Table D-9.1 and D-9.2.
    • Sizing calculations for Best Management Practices (BMPs) proposed.
    • When required per 2017 SWES D4-03, provide hydrologic/hydraulic calculation methodologies, inputs, assumptions and results for analysis of off-site conveyance capacity.

    Contact

    Utility Review
    Telephone
    425-452-4187
    Email
    utilityreview@bellevuewa.gov

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    • Bellevue, WA 98004
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