D&K’s dam teams offer a full complement of technical services to dam owners: investigation, hydrologic and hydraulic studies, dam breach analyses, emergency action plans, needs analyses, flood damage surveys, subsurface investigations, evaluation of alternatives, cost estimating, community coordination, state and federal permit assistance, design, plans and specifications, and construction administration. D&K dam engineers are supported…
The Baker River Site 8 dam is a 1,462-ft-long by 63-ft-high dam with a maximum storage capacity of 4,750 acre-ft and is fed by a 15.58-sq.-mi. drainage area. The dam uses a vegetated auxiliary spillway to pass high flows, and the main spillway system consists of a concrete riser and a small stilling basin. Constructed…
Rainbow Dam is a high-hazard, 2,000-ft-long by 42-ft-high earthen embankment flood-control dam bounded immediately upstream by a public school campus and downstream by a public park and large neighborhood. The auxiliary spillway did not have adequate hydraulic capacity during the freeboard hydrograph event, and the dam’s internal drainage system did not meet dam safety requirements….
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…
Storm flows from Jewell Brook in Ludlow are controlled by flood control dams (numbered 1, 2, 3, and 5) located in a rural, hilly, largely forested area. Previous evaluations of this system indicated that Site 1 had the potential for overtopping and the spillway design hydrograph would exceed allowable stresses at three of the system’s…
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 Allen Site Dam is a 1,520-ft-long by 21-ft-high earthen NRCS flood-control dam in a suburban context. The Town of Walpole wanted the dam maintained to provide flood mitigation for an increased level of downstream property development. D&K provided survey, inspection, breach analysis, and a range of other services to evaluate the current state of…
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…