Dam engineering is one of Gannett Fleming's areas of special competence. Our firm's completed projects include more than 100 new dams, modification of more than 250 existing dams, and safety evaluations of more than 500 dams. Our full scope of services for dam rehabilitations includes design through construction management and follow-up performance monitoring.
Our firm has experience with a wide range of dam types including earthfill, rockfill, concrete gravity, timber crib, slab and buttress, movable crest (steel or rubber gate), and concrete arch dams. We have responded to a wide variety of clients' water resources needs, including watershed management, water supply, hydropower, navigation, flood control, and recreation.
We have been involved in the design and construction of roller-compacted concrete (RCC) dams since 1986. Within the past five years, we have completed five new RCC gravity dam projects, totaling more than 2 million cubic yards of RCC. In 2003, we completed the RCC design for the Olivenhain Dam as the major subconsultant partner on the design team. This 320-foot-high RCC dam is the tallest in North America. We have been a national leader in the use of this new technology for dams and dam rehabilitation, have published numerous technical articles, and have organized technical seminars on the topic of RCC construction for dams.
We have designed new dams ranging in size from five feet high to over 300 feet high. One of our largest recent dam projects, the $30 million Loch Raven Dam Project, designed for the City of Baltimore, received the ASDSO Rehabilitation Project of the Year Award.
Over the past 10 years, we have designed 10 new dams and 50 dam rehabilitation projects. These new dams have been earthfill, RCC, conventional concrete, and inflatable. The rehabilitation projects have included earthfill, rockfill, concrete, masonry and timber crib dams with rehabilitation construction costs ranging from $70,000 to $300 million.