Highway Hydraulic Engineering State of Practice (2020) / Chapter Skim
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Pages 65-67
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From page 65... ...
65 The conclusions summarize the literature review, survey responses from 38 state DOTs, and interviews and case example documentation provided by state DOT hydraulic engineers in four states to provide a snapshot of the state of the practice. The synthesis found that advances in the selected topics occurred for a variety of reasons, including advances in technology, cost saving measures, FHWA initiatives, safety concerns, and increased frequency of severe rainfall events and flood hazards.
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From page 66... ...
66 Highway Hydraulic Engineering State of Practice • From literature it was discovered that reasons for changes in bridge scour computations and countermeasures include lack of data, uncertainty in rock characteristics and appropriate sediment size to input into scour equations, suspected over-prediction of scour, countermeasure failure, and uncertainty in dealing with cohesive soils. Advanced Hydraulic Modeling • 47% (18)
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From page 67... ...
Conclusions 67 • One state of 38 responding states reported having policies pending for a range of coastal protection measures; • Five (13%) of 38 responding states reported current or pending policy or guidance on specific design practices for flood protection of roadways from erosion due to waves or changes in water surface elevation; and • Eight (21%)
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