EP conducted field investigations, borings, hydrologic-hydraulic modelling, and prepared bid and design documents for the Town. The designs incorporate new stormwater treatment for total suspended solids remove of as least 80% and subsurface infiltration below the roadways. The design will add up to 93,000-gallons and 17,000-gallons of stormwater storage and recharge on Thomas Street and Ring Road, respectively.

The project is expected enter the bidding phase this summer.

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As a coastal community, Marshfield faces additional climate-related challenges such as rising sea levels, extreme weather events, and increased flooding. Adequate funding is crucial for asset management and Marshfield must balance limited budgets with the need to maintain and upgrade critical infrastructure.

The secure, streamlined stormwater database combined new and old data into a cost-effective and efficient web-based dashboard, supporting the DPW’s goal to provide essential public works infrastructure and support services for the residents of Marshfield.

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The plan sets priorities for improving DW Field Parkway, creating safer pedestrian and bicycle access, improving parking, incorporating sustainable stormwater solutions, and upgrading signage and waste collection.

The Plan identifies specific projects to be implemented over the next 10-20 years to provide a safer and more sustainable natural resources for the City of Brockton and surrounding communities.

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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.

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EP sponsored the Young Professionals Summit on Sunday which kicked off the multi-day event.

Moderator Sessions

• On Tuesday, Eric Kelley moderates Session 17, Stormwater 2: Tools – Expanding your #Stormwater Toolbox.
• On Wednesday, Natalie Pommersheim moderates Session 33, Stormwater 4: Next Steps in Addressing the Stormwater Nutrient Dilemma

Presentations

• Andrew Grota and Town of Plymouth’s Douglas Pinard present Tuesday during Session 16 – Collection Systems 3, “Step by Step: A Data Collection and Planning Approach for Addressing Sewer Collection System Improvements through the Plymouth CMOM Program”
• Chris Dapson and Eric Kelley present Wednesday during Session 26 – Stormwater 3, “The Climate Change Climb – Preparing for Rising Seas and Extreme Storms in Coastal Communities”

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To fix the problem, EP designed an increased outlet pipe capacity, a slope relief drainage system and an improved double-grated inlet and manhole. Since the storm flow from the system ultimately discharges to Bagg Brook, EP presented this approach to the Conservation Commission for approval prior to construction.

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Each year, at least one quarterly visit is conducted during a rain event, to observe the site conditions with active discharges. Recommendations for improvements and assisting the community with any future design considerations are provided by EP based off conditions found at each facility. Improvements may include site regrading, maintenance of structures or BMPs, as well as improved storage of materials.

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The Cobble Mountain Reservoir serves as the Commission’s main drinking water supply for the greater Springfield, MA area. The first phase of this work focuses on daylighting a failing 18-inch diameter culvert. During our work, EP will conduct a site assessment, Hydrologic-Hydraulic (H-H) Model, and design and permitting of the removal of the existing culvert and restoring the stream back to more natural conditions.

The project, once complete, will reduce maintenance, remove the blockage due to woody debris buildup at the culvert and reduce sediment entering the reservoir.

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The first phase of that project is scheduled for completion in October, including the construction of an underground 4’x4’ concrete box culvert storage system to capture storm flows and then moderate their discharge to the existing system through a 10-inch diameter orifice.

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During regular storms Highland Avenue would flood, which presented safety concerns and issues for local businesses. EP completed an alternatives analysis using HydroCAD Hydrologic-Hydraulic modelling software. The selected solution included a drainage retrofit that included diverting up to 10,000-gallons of stormwater from Route 6, which sits above Highland Road, to a surface infiltration basin with forebay treatment. EP and the Town of Truro worked closely with MassDOT and abutting property owners during design and construction.

The project was completed in January 2023. We are pleased to report that this drainage retrofit has significantly reduced flooding on Highland Road.

May 2022 Update

The Town of Truro sees regular local flooding on one of its main areas on Highland Road, a MassDOT maintained roadway. Flooding has been observed at more than 1-foot deep causing traffic safety issues and structural damage.

EP worked closely with the Town and MassDOT, creating solutions for flooding relief and stormwater treatment benefits. EP will continue to support the Town during bidding and construction, with project construction beginning in Fall 2022 using MassWorks funding, and is excited to see the community get relief from these ongoing challenges.

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