There are a number of medium head, 40 to 110 feet of fresh water, hydro facilities throughout the United States reaching the end of design life cycles. While routine maintenance of facility generating and operating equipment is often well understood and vetted through procedure revision, significant maintenance of static portions of the main structure of these facilities is rare and unique. Included in this paper and presentation is a case study of one such project including: the feasibility study, cofferdam design and fabrication, cofferdam installation, removal of an existing trash rack rail system, design and fabrication of a new trash rack rail system, installation of a new trash rack rail system and removal of the cofferdam. The project served as a prototype rehabilitation approach for the 44 such rail systems at the facility and included disciplines of mechanical and civil engineering, as well as, skilled labor professions of iron workers, commercial divers and concrete masons. The case study serves as an aid in determining the feasibility of medium head facility rehabilitation projects using cofferdams.
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