Green Stormwater Infrastructure Info

In 2018 and 2019 leveraging funding from a Municipal Vulnerability Grant, the City of Somerville investigated the potential for Green Stormwater Infrastructure (GSI) to provide flood relief and water quality benefits. The study investigated eight representative neighborhoods to determine the extents to which GSI could be implemented, and utilized our advanced hydraulic model to determine their benefits for a range of storm events.

This report provides the details on GSI types and logistics for locating them in our Rights-of-Way:

This report and its appendices provide the conclusion of the benefits evaluation for implementing GSI both in the Rights-of-Way and on private property:

The report provides important details, but in general, the volume of flood relief provided by GSI varies by location throughout the City, but that volume is substantially smaller than the flood volumes produced by large storms. However, GSI does provide significant water quality benefits, particularly with respect to phosphorus, which is the primary pollutant of concern when considering sewer separation and new stormwater outfalls. Therefore, the solution to flooding will require a combination of “green” and “grey” infrastructure solutions. Those conclusions were carried forward to the Citywide Drainage and Water Quality Master Plan.

Additionally, the 2018 effort produced planning guidance for both City projects and to provide developers obtaining building permits on how to design GSI. That guidance can be found here:

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