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Upper Shawme Dam Design
Town of Sandwich, Barnstable County, Massachusetts
Upper Shawme Dam Design, Sandwich, Barnstable County, Massachusetts
McMahon completed final design, environmental and all permitting, and construction management services for rehabilitation of the Upper Shawme Dam. After a Phase 1 Dam Inspection, extensive subsurface, hydrologic and structural analyses were conducted and used to design the dam embankment, spillway, and hydraulics for the dam rehab. A detailed Emergency Action Plan and Operation and Maintenance Manual were written. Numerous applications, permits, and certifications/ licenses were successfully completed and/or obtained during the environmental permitting process, involving multiple state and federal agencies.
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Fort Meadow Reservoir Dam
City of Marlborough, Middlesex County, Massachusetts
The City of Marlborough contracted McMahon to complete an Emergency Action Plan (EAP) for the Fort Meadow Reservoir Dam, a classified large, high hazard (Class I) structure, located in the Concord (Assabet) River Basin. McMahon completed hydrologic and hydraulic analyses to develop dam breach hydrographs and subsequent downstream flood routings. The EAP report, which included inundation mapping, notification, warning, surveillance, and evacuation procedures, identification of alert levels, and the definition of responsibilities and duties of the personnel was also prepared.
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Lake Williams Dam
City of Marlborough, Middlesex County, Massachusetts
McMahon completed an Emergency Action Plan (EAP) for the Lake Williams Dam, which consists of an earthen embankment, concrete/mortared-stone spillway, and a low-level outlet. The Lake Williams Dam has a maximum storage capacity of 500 acre-feet. Therefore, in accordance with Department of Conservation and Recreation (DCR) Office of Dam Safety, Lake Williams Dam is classified as an intermediate size, high hazard (Class I) structure. McMahon completed hydrologic and hydraulic analyses to develop dam breach hydrographs and subsequent downstream flood routings in order to determine downstream inundation limits for the Sunny Day and flood failure scenarios. In addition, McMahon prepared an EAP report to meet the guidelines of the Massachusetts Emergency Management Agency and DCR.
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