Description
Tributary 7 of Potash Brook flows through the Butler Farms and Oak Creek Village neighborhoods. The brook passes beneath City streets via culverts in four locations before flowing into the Wheeler Nature Park located to the north of the neighborhood. Two of the four culverts were replaced as part of the Oak Creek Village Culvert Replacement project, which involved replacing the two downstream culverts under Moss Glen Lane in the OCV neighborhood.
Problem
When the culverts the neighborhood were originally designed, permitted and constructed they met the current requirements for culvert sizing. However, over time these standards have evolved and the original culverts are considered undersized relative to the standards in use today. Under current standards, new culverts must have sufficient capacity to pass stream flow during a 25-year storm event (4.0 inches of rain in a 24 hour period).
Benefit
This project will include replacing the existing corrugated metal pipe culverts in both locations under Butler Drive with precast concrete box culverts. The new culverts will provide sufficient capacity to allow the stream to pass under the road without overtopping during the 25-year storm event. This project improves stream health and reduces the chance of flooding in the neighborhood during large storm events. It also improves the ability of aquatic organisms to move in the stream.
Best Management Practices
Replacement of undersized and aging drainage infrastructure with new appropriately sized drainage infrastructure.
Funding Sources
This project has received grant funding support from VTrans. The remaining project costs will be paid using stormwater utility capital project funding.