Hoyle, Tanner & Associates, Inc.

Farrell Street/Potash Brook Stormwater Improvements

South Burlington, Vermont

The City of South Burlington needed to replace a severely deteriorated and undersized culvert that carries Potash Brook beneath Farrell Street. In addition, the City wished to provide stormwater treatment for runoff from approximate 40 adjacent acres that discharges into Potash Brook in the vicinity of the Farrell Street crossing.

Hoyle, Tanner evaluated several culvert replacement options as well as various stormwater treatment alternatives. Based on this evaluation, an aluminum box culvert was chosen to replace the existing deteriorated culvert. A wet extended detention pond, bioretention facility, proprietary underground hydrodynamic treatment practice and pervious pavement products were selected to maximize stormwater treatment opportunities in this area.

Services Provided

	Preliminary and Final Designs
	Permit and Land Acquisition Coordination
	Contract Document Preparation
	Bidding and Contract Administration
	Construction Observation

Project Goals:

	Provide increased hydraulic capacity of the Farrell Street / Potash Brook culvert
	Stabilize streambanks in the vicinity of the Farrell Street / Potash Brook culvert
	Maximize stormwater treatment opportunities to reduce impact on Potash Brook

Unique Features:

	Closure of Farrell Street and development of associated traffic control plan
	Temporary diversion of Potash Brook
	Development of formal Erosion Prevention Sediment Control Plan

Project Highlights:

	Installation of 19'-10” wide aluminum box culvert
	Recognized VTDEC Stormwater Offset Capacity Project