• Storm Drainage Report 

    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 most current City of Bellevue 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 Reference SWES, Figure 5.1, for infiltration feasibility.
    • Details of infiltration testing, if required (test hole must be a minimum of six feet deep per SWES Appendix D-10). 
    • Discussion of how each minimum requirement is being met. 
    • Thorough discussion of List #1, List #2 or LID performance standard (SWES D104.2(e)). Include infeasibility criteria per SWES Table D-9.1 and D-9.2. 
    • Sizing calculations for Best Management Practices (BMPs) proposed. 
    • When required per SWES D4-03, provide hydrologic/hydraulic calculation methodologies, inputs, assumptions and results for analysis of off-site conveyance capacity.