Risk-Based Management Guidelines for Scour at Bridges with Unknown Foundations (2007) / Chapter Skim
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NCHRP 24-25 Page 1 Phase II Final Report EXECUTIVE SUMMARY Bridges are skillfully designed to withstand the most common natural hazards (e.g. floods, erosion/scour, earthquakes)
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NCHRP 24-25 Page 2 Phase II Final Report the sum of the cost of replacing the bridge, the costs of lost time and additional mileage on detours, and the cost of loss of life (in the event of failure)
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NCHRP 24-25 Page 3 Phase II Final Report scour failure was estimated by contacting transportation officials about historical scour failures nation-wide. Twenty-five States provided data via phone interviews and emails, and this data suggests that the annual average probability of failure is 33/161,000 = 0.000205, or about 1 in 5,000 per year.
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NCHRP 24-25 Page 4 Phase II Final Report bridges with known foundations and scour evaluations, and two of the case studies involved bridges that actually failed due to scour. The results show that most of the twenty-nine case studies (including the scour failures)
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