Effective March 1, 2013, DPD published two joint Directors’ Rules with Seattle Public Utilities:
These Directors’ Rules clarify our construction requirement to implement “green stormwater infrastructure (GSI) to the maximum extent feasible.” They also define steps for reporting and evaluating compliance with this requirement.
Green stormwater infrastructure includes practices designed to reduce stormwater runoff from development using infiltration, evapotranspiration, and/or stormwater reuse. To be considered GSI, a function in addition to stormwater management such as water reuse, providing green space and/or habitat must be provided. Examples of GSI include trees, bioretention cells, permeable pavement, green roofs, and cisterns. GSI is also used to comply with flow control requirements, water quality treatment, or both, depending on how they are designed and constructed.
For more information and to read the Director’s Rules, please visit www.seattle.gov/dpd/Codes/StormwaterCode/Overview/default.asp.
If you have questions about how GSI relates to your construction project, please contact:
DPD Side Sewer & Drainage Review Desk