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31 <br /> schnabel-eng.com 2. Project References / Lake Orange Intake Tower / 15 <br /> Salem Lake Dam <br /> WINSTON-SALEM, NC <br /> SERVICES Salem Lake is a 285-acre reservoir providing the second largest <br /> Alternatives Evaluation source of drinking water for the City of Winston Salem. The <br /> Concrete Intake and Water dam, built in 1919, had been raised four times: in 1921, 1931, <br /> Supply Piping 1947, and 1996. After completing a hydrology and hydraulics <br /> Contract Administration assessment, it was clear to Schnabel that the spillway had <br /> Dam Breach Inundation Map insufficient capacity to pass the design flood requirement. <br /> Dam & Embankment Design <br /> Inspection determined that this high-hazard dam exhibited <br /> structural deficiencies that threatened its safety, downstream <br /> Emergency Action Plan residents, and the city's water supply. <br /> Quality Assurance Testing <br /> Resident Project Rep Schnabel performed subsurface investigations and analyses to <br /> diagnose the original dam, and then evaluated alternatives to <br /> OWNER/CLIENT address the various deficiencies. Ultimately, it was found that <br /> City of Winston-Salem replacement of the dam with a straight concrete gravity section, <br /> with an earthen embankment on the right side, provided the <br /> Jack Fitzgerlad best and most economical solution. <br /> P: 336.747.7473 <br /> E: jackf@ci.winston-salem.nc.us Design included foundation treatment, grouting, and <br /> construction of a 50-ft high mass concrete gravity dam including <br /> We knew from the very a 200-ft long, two stage ogee weir, with stepped spillway and <br /> beginning that we shared similar energy dissipater. The earthen portion consists of a zoned <br /> values-integrity, accountability, embankment with a chimney drain and upstream riprap wave <br /> teamwork and openness. protection. A new water supply intake tower including trash <br /> racks, fish screens, and outlet works is located on the upstream <br /> Schnabel Engineering has face of the dam. The new dam was built at the foot of the old <br /> worked over the years with the dam, and the old dam was demolished, with no interruption in <br /> City of Winston-Salem and has water service to the community. <br /> never lost those core values.We <br /> have grown to trust and depend Schnabel provided a resident project representative for <br /> on their professionalism and the duration of construction. We also provided contract <br /> expertise. administration services, quality assurance testing, preparation of <br /> - David Saunders, PE, Director record drawings, and project close-out. Construction completed <br /> in August 2012. <br /> Build Better.Together. <br />