Stormwater Management

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Garden Homes Management
117 Cascade Boulevard, Milford, Connecticut

This 36-unit residential apartment system sits on 1.4 acres of upland surrounded by wetlands. In addition to addressing groundwater recharge and water quality, the stormwater management system had to provide no increase in the post-development runoff from the 2-year to the 100-year rainfall event.

By utilizing two Bioretention cells for the roof runoff, and permeable pavement for the driveway and parking area, this standard was achieved.

We designed a Bioretention system to address the water quality from an impervious area at the wastewater treatment plant, which previously was directly discharged into the Farmington River.

We designed a Bioswale to address the water quality from the building’s roof and parking area, which previously was a direct discharge into the drinking water supply reservoir.

We designed a stormwater management system for the 40,000 square foot medical office building and the 220-space parking area without any structural drainage components.

Runoff was handled by Bioswales, Bioretention, and Permeable Pavement systems to address groundwater recharge, water quality, and peak rate attenuation for the 25-year rainfall event. There will be no surface water discharge for all rainfall events up to and including the 50-year event.

We designed LID retrofits consisting of Bioretention cells, Interlocking Concrete Permeable Pavers, and Concrete Open Cell Pavers to address the water quality of runoff in a dense urban area, as well as increasing the time of concentration to reduce the potential of downstream flooding in the city of Zhenjiang, China. The LID retrofits were designed to contain runoff from a 65 mm (2.6”) rainfall event to address water quality, and to handle runoff from a 150 mm (5.9”) rainfall event to address urban flooding.