South Henderson CSO Green Infrastructure

Project 24 of 29

South Henderson Combined Sewer Overflows Green Infrastructure Alternatives — Seattle WA

Seattle Public Utilities

This extensive feasibility study examined 59 sites in south Seattle to determine if applying green infrastructure alternatives would be a viable option in controlling Combined Sewer Overflows (CSO) events. Research on numerous green technologies such as green roofs, amended soils, cisterns, rain gardens, pervious pavements and stormwater dispersion was included in technical memoranda for each option with advantages and challenges associated with each.

LPD further analyzed stormwater separation options at seven sites within Henderson Basin 49. Documentation for each site detailed stormwater contributions to the combined sewer; steps required to separate stormwater; and issues to be considered. The KCRTS model was used to determine an approximate reduction in the 100 year peak flow rate tributary to the combined sewer at each location.

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