Norwalk to replace pipe and install box culvert at Cannon Street outfall to reduce neighborhood flooding

Summary

City consultants presented plans to replace a 36‑inch reinforced concrete pipe with a 48‑inch pipe and add a 6x6 concrete box culvert at the Betts Pond Brook outfall; staff said hydraulic modeling shows the change will mitigate local flooding and agreed to provide drainage and planting plans before the March 10 meeting.

Norwalk staff and consultants presented a drainage‑improvement project for the Glen Denning–Cannon Street corridor on Feb. 24, proposing to replace an existing 36‑inch reinforced concrete pipe with a 48‑inch pipe and to install a 6‑by‑6 concrete box culvert with prefabricated wing walls at the outfall to Betts Pond Brook.

Jennifer Martinez Torres of Woodard & Curran, the project’s design engineer, told the Conservation Commission and Inland Wetland Agency the work within 100 feet of Betts Pond Brook is intended to accommodate a larger stormwater conveyance, reduce upstream flooding observed in the Glen Denning/Cannon Street area, and stabilize the existing eroded outfall.

Consultants said the city’s hydraulic analyses — run in a dynamic model and including multiple storm scenarios such as the 25‑year event — indicate the larger conveyance plus the box…

Norwalk to replace pipe and install box culvert at Cannon Street outfall to reduce neighborhood flooding

Summary

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