Highway Hydraulic Engineering State of Practice (2020) / Chapter Skim
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Pages 55-64
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From page 55... ...
55 Overview Interviews were conducted with four state hydraulics DOT representatives, selected by examining the survey responses to those who replied "yes" to the survey question asking if they would be willing to participate in a follow-up interview to collect case example information and via literature review of published materials. Case examples were to illustrate different policy changes, diversity in topics, and early adopters of new/innovative/successful practice.
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56 Highway Hydraulic Engineering State of Practice the effectiveness of scour countermeasure designs as predicted by 1D and 2D models (Carlson 2019)
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Case Examples 57 who pay for data storage. Large files can also be challenging for file sharing.
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58 Highway Hydraulic Engineering State of Practice the 50-year flood frequency, and even though overtopping is shown to occur for the 100-year flood event, this is predicted to occur at a low point on the roadway outside the project limits (Georgia DOT 2018b)
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Case Examples 59 Office is in the process of acquiring LIDAR data for 89 more counties, but this data will not be available anytime soon. Thus, obtaining useful surface data for 2D modeling can still be costly (Nguyen 2019)
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60 Highway Hydraulic Engineering State of Practice updated DFIRMs. These maps and other flood risk information is publicly available on the North Carolina Flood Risk Information System (FRIS)
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Case Examples 61 previously. Further, this policy was reinforced by both Federal and State Executive Orders and was reaffirmed in the commitment by the North Carolina DOT Highway Administrator at that time (2006)
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62 Highway Hydraulic Engineering State of Practice • Continued planning and prioritization of approximately 130 coastal bridges to provide counter measures for wave and surge forces in extreme events; and • Development of LIDAR and advanced hydraulic modeling technology to better predict water surface elevations and optimize design to minimize litigation risk associated with North Carolina DOT projects. Improving Infrastructure on a Case-by-Case Basis at Delaware DOT Delaware DOT faces many challenges due to sunny day nuisance flooding and flooding associated with wave impact and tidal surge.
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Case Examples 63 A significant amount of national-level research is being conducted to help shape future policy, including the following: • NCHRP Project 20-59(53) : "FloodCast" (report pending)
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64 Highway Hydraulic Engineering State of Practice Road elevation is still an appropriate strategy in some cases. As an example of road elevation, SR 54 outside of Fenwick Island is a major artery to the beach, as well as a hurricane evacuation route that was affected by tidal flooding.
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