Stormwater

Small Project Stormwater Management Guide

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The Phase II Western Washington National Pollutant Discharge Elimination (NPDES) stormwater general permit implements the federal Clean Water Act. The permit is administered by the Washington State Department of Ecology and requires stormwater management for new development and/or redevelopment projects that add new impervious surfaces, replace impervious surfaces, and/or have land disturbing activities.

This packet was developed as a step-by-step guide designed to help small-scale developments navigate the Department of Ecology's 2019 Stormwater Management Manual. The worksheets in this packet are designed to collect the necessary information from an applicant about their project and guide them towards approved stormwater management measures that are appropriate for their specific site and project.
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Guide1 document

  • Small Project Stormwater Management Guide
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Worksheets11 documents

  • Worksheet 1 - Project Information
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  • Worksheet 1B - NRCS Soil Type
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  • Worksheet 1C - Small Scale Infiltration Testing
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  • Worksheet 1D - Infiltration Testing, Pilot Infiltration Testing (PIT)
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  • Worksheets 2 and 3 - Flow Chart for Determining Requirements
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  • Worksheet 5A - Stormwater BMP Selection
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  • Worksheet 5B - BMP Infeasibility Criteria
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  • Worksheet 5C - Stormwater Report
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  • Worksheet 5D - Stormwater Site Plan Set
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  • Worksheet 6A - SWPP Narrative
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  • Worksheet 6B - SWPP Plans
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