Seattle Department of Construction & Inspections
Nathan Torgelson, Director
Stormwater Codes and Rules Update - Documents
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Accomplishments
The 2016 Stormwater Code and Manual became effective on January 1, 2016. These rules replaced the 2009 Stormwater Code and Directors' Rules, which were administered jointly by SDCI and Seattle Public Utilities (SPU).
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Documents
The 2016 Stormwater Code and Manual became effective on January 1, 2016. These rules replaced the 2009 Stormwater Code and Directors' Rules, which were administered jointly by SDCI and Seattle Public Utilities (SPU).
Documents
- 2016 Stormwater Code Ordinance Council Bill (CB 118465)
- Stormwater Manual - Volumes 1-5 and Appendices (Directors' Rules SDCI 21-2015/SPU DWW 200)
- Summary of Changes to the Stormwater Manual
- 2016 Applicability Ordinance (CB 118466)
2009 Stormwater Code
Forms and Documents
- Standard Construction Stormwater Control and Soil Amendment Standard Plan
- Standard Drainage Control Plan - Small Projects
- Green Stormwater Requirement Calculator
- Pre-Sized Flow Control Calculator
- Infiltration Sizing for Small Projects Table
- DWW - 202 Small Project for OnSite Infiltration - No POD Procedure
2009 Stormwater Code
2009 Stormwater Manual
- Director's Rule 15-2009 / SPU 2009-003, Vol. I - Source Control Technical Requirements Manual
- Director's Rule 16-2009 / SPU 2009-004, Vol. II - Construction Stormwater Control Technical Requirements Manual
- Director's Rule 17-2009 / SPU 2009-005, III - Stormwater Flow Control and Water Quality Treatment Technical Requirements Manual
- Director's Rule 18-2009 / SPU 2009-006, Vol. IV - Stormwater Code Enforcement Manual
Reference Materials
- Director's Rule 13-2010 / SPU 5-2010, Groundwater / Dewatering
- Director's Rule 15-2012, Requirements for Green Stormwater Infrastructure to the Maximum Extent Feasible for Single-Family Residential and Parcel-Based Projects
- Director's Rule 16-2012, Requirements for Green Stormwater Infrastructure to the Maximum Extent Feasible for Roadway, Trail, and Sidewalk Projects, DWW-201.2
- Directors Rule: DWW-430.1, Identified Public Combined Sewer Basins Where Flow Control is Not Required (Note: if the immediate downstream drainage system is considered to be "Capacity Constrained," Flow Control may still be required.)
- Tip 531, Post Construction Soil Management
- Approved Tree List - Note: Trees in the "Small Category" are not eligible for credit
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