After completing a $7M rehabilitation project to its Water Street Pump Station (WSPS) in 2020, the Town of Plymouth partnered with EP again to design and construct a flood barrier wall around the station as well as drainage improvements on site to protect this vital component of the Town’s sewer system from extreme coastal flooding.
The site drainage was modified to prevent any flooding within the flood barrier wall during storm surge events. The existing catch basin discharge in the north corner of the paved area was fitted with a 12-inch gate valve. The manual gate valve will isolate the catch basin and prevent flooding from outside of the flood barrier wall backing into the WSPS yard through the basin. While the existing catch basin is isolated from the drainage outside of the WSPS, storm water will be collected into the existing catch basin via the existing on-site storm water collection system and will be pumped out of the basin with a trailer mounted dry-prime trash pump (supplied under this project).
The perimeter wall was designed as a reinforced concrete foundation and wall with New England stone veneer facing along the building. As part of the aesthetic design, the permanent flood barrier wall structure included a granite stone cap.
