Two dams in a park owned by a community association were damaged by storm flows. The lower dam was breached and required design alternatives for its removal; the upper dam had to be evaluated for repairs. D&K reviewed the structural elements of both dams, the retaining wall, and the stream character upstream and downstream. Our…
The 40-year-old wastewater treatment facility, originally designed for a 20-year service life, was past due for a total treatment process change and facility upgrade. The project objectives included: utilize a state-of-the-art treatment process, design capacity for nitrogen removal, consider operational efficiencies and long-term operating costs, address issues with the location in a floodplain, and develop…
Framed by a public park and a residential area and carrying a city street, Robin Hood Dam was reclassified by the State of New Hampshire as a high-hazard dam, and its spillway did not have the capacity to meet New Hampshire Dam Safety requirements. The City of Keene engaged D&K to evaluate the dam, develop…
The Upper Wilson Pond Dam is a small, high-hazard, earth embankment dam impounding a recreation pond. Recently found to be in poor condition, the dam is owned by the Town of Swanzey, and the pond is bounded by homes and properties located within the City of Keene. D&K’s project team completed a study that evaluated…
Curtis Pond, the dam, and its site serve as a beloved cultural hub and source of identity to Calais and the Maple Corner community. The dam underwent excessive seepage, movement of the stone wall, and piping of the earth/sand backfill through voids in the wall. The project had long-term enthusiastic partners, including the Curtis Pond…
The Norwich Reservoir Dam was a run-of-the-river, cyclopean concrete gravity dam located on the Charles Brown Brook. The dam impounded a reservoir which became silted in, and the dam served no useful function. The dam caused significant negative impacts to the brook and to downstream reaches. The dam blocked fish passage and caused downstream sediment…
The City of Bangor conducts operations in a 100+-year-old former US Courthouse and Post Office building, which includes approximately 45,000 SF of space. Over a two-year period, the City invested approximately $10M to renovate this historic city hall. Renovations to the first floor included flexible workspaces, replacement/upgrade of the HVAC system, a new elevator, and…
To improve access to transit and housing, the One Taylor Street project included the design of a new four-story transit center. Sited on a highly constrained, urban brownfield site, the building supports public bus operations, a visitor’s center, traveler services, bike lockers, and apartments. D&K’s design included three bus parking bays, a 23-car parking area,…
Sweet Pond Dam is a 20-ft-high by 77-ft-long circa-1928 dam that impounds an 18-acre pond with a contributing drainage area of approximately 1 square mile. The dam sustained uncontrolled and excessive seepage through highly fractured and weathered bedrock and posed a barrier to AOP. D&K provided planning, evaluation, alternatives analysis, preliminary and final design, permitting…