bioretention

The Town of Hamden’s Bioretention Project is the largest municipally owned rain garden in the state! Save the Sound, in partnership with the Town of Hamden, completed this large-scale rain garden project at Hamden Town Center Park to improve local water quality, restore habitat, and enhance community resilience. The project transformed approximately 2.5 acres of lawn into a functioning green infrastructure system that now manages runoff from an 88-acre urban watershed draining Dixwell Avenue and surrounding neighborhoods. Prior to the project, stormwater often overflowed directly into Pardee Brook and the Mill River, carrying pollutants and inundating the park.

The newly constructed rain garden was engineered with layers of soil, sand, and rock, and planted with more than 7,000 native grasses, flowers, and shrubs thanks to additional support from the Land Trust of Hamden. These plantings naturally filter pollutants such as fertilizers, road salt, and chemicals. Community volunteers helped complete the planting, strengthening local stewardship in the Town of Hamden.

The Connecticut Department of Energy and Environmental Protection’s (DEEP’s) Land and Water Resources Division requests proposals for the new CT DEEP Long Island Sound Ecosystems Grant, made possible by financial support provided by the Long Island Sound Partnership from the U.S. EPA. There are two primary goals of the program: 1) to promote large-scale habitat restoration and enhance restoration planning, while also helping coastal communities and ecosystems adapt to changing environmental conditions; and 2) to further promote the application of green stormwater infrastructure techniques to reduce nonpoint source pollution, improving water resource quality.

This workbook made by Groundwork Bridgeport provides a thorough but accessible introduction to green stormwater infrastructure. The workbook explains the issues that green infrastructure can help solve, introduces several green infrastructure methods, and then provides definitions, explains why each is uses, and details how to build them.

In 2019, the City of Norwalk secured a LIS Future Fund grant to install green infrastructure in the Webster Street Parking to reduce the impacts of stormwater on the Norwalk River and Harbor and mitigate local flooding of surrounding businesses through the installation of four different types of infiltration and bio-retention structures:
1) Underground infiltration systems.
2) Retention basins and curb inlet planters in eight different areas.
3) Porous pavement with storage in two areas.
4) Infiltration gutters and tree filters in two other areas.