Culvert/Bridge Hydraulic AnalysisOctober 30, 2017

University of DelawareSharp Campus

Lewes, DE

Gerald J. Kauffman, Ph.D., P.E.University of Delaware

Water Resources CenterNewark, DE

19716

Red Clay Creek, Route 4, StantonTropical Storm Jeanne, Sep 28, 2004DGS

Culverts (Inlet Control)

FHWA HY 8 Culvert Analysis Model

10.2. Recommendations1. Review and revise the DelDOT road design and bridge design manuals to consider strengthening the hydraulic design criteria for bridges and culverts to pass the 100-year frequency flood (instead of the current 50-yr flood specification)

2. Conduct a systematic review of the DelDOT system to enlarge and/or replace bridges and culverts to adequately pass the 100-year flood and raise bridge deck elevations above the 100-year flood elevation with at least 2 feet of freeboard.

3. Conduct a strategic review of the DelDOT highway system to determine the road segments at high risk to flood inundation and program capital funding to raise or flood proof these vulnerable roadway sections.