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<br />. <br /> <br />. <br /> <br />. <br /> <br />Friday, July 12 <br /> <br />3:15 p.m.-4:45 p.m. <br /> <br />The Bureau of Reclamation's <br />Early Warning System Program, <br />Olympus Dam Case Study <br /> <br />David B. Fisher and Pat Hagan <br />U.S. Bureau of Reclamation <br /> <br />The Bureau of Reclamation's Dam Safety Program uses Early Warning Systems (EWS) as a <br />non-structural means to enhance public safety below its dams. The Olympus Dam Early <br />Warning System was designed based on the revised probable maximum flood derived from the <br />transposing the Big Thompson Storm to the drainage area located upstream from the dam. A <br />case study on Reclamation's EWS design process and lessons learned during this process will <br />be presented. <br /> <br />Dams, Defects and Time <br /> <br />Wayne J. Graham <br />Sedimentation & River Hydraulics Group <br />U.S. Bureau of Reclamation <br /> <br />Colorado has experienced more than 100 dam failures since the 1800s. Information associated <br />with these failures, as well as data from failures throughout the United States, will b analyzed <br />to show trends and patterns. Many of the dams that have failed have done so during their first <br />few years of operation, an indication that there were design or construction defects. Some dams <br />that survive their early years have still failed. Have these failures been the result of original <br />design defects of deterioration? During the 8 years from 1970 to 1977 approximately 260 people <br />died as a result of U.S. dam failures. During the 18 years from 1978 to 1995 there were only <br />16 fatalities. Possible reasons for this significant reduction in dam failure fatalities are <br />presented. <br /> <br />24 <br />