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BIBLIOGRAPHIC OATA II. Report No. f' 3. Recipient's Accession No. SHEET FHWA-TS-80-226 4. Title and Subtitle 5. Report Date March 1980 HYDRAULIC DESIGN OF BRIDGES WITH RISK ANALYSIS 6. 7. Author(s) 8. Performing Organization Repr. V. R. Schneider and K. V. Wilson No. 9. Performin,g Organization Name and Address 10. Project/Task/Work Unit No. U.S. Geological Survey, Water Resources Division Gulf Coast Hydroscience Center 11. Contract/Grant No. National Space Technology Laboratories P.O. 5-3-0194 NSTL station, MS 39529 . 12. Sponsoring Organization Name and Address 13. Type of Report & Period Federal Highway Administration Covered Final Report Office of Development May 1975 - Dec. 1979 Washington, DC 20590 14. 15. Supplementary Notes 16. A bstracrs studies and reports which implement the This manual presents example philosophy that the total stream crossing including the approach fills in the flood plains and all necessary waterway openings should be designed and constructed for the least total expected cost to the public. The total expected cost includes the capital investment in the highway, expected replacement and repair costs as a result of flood damage s, expected user costs from traffic interruption and detour, and expected backwater drainages during the service life of the highway. Techniques for making engineering and economic studies for the least cost designs are presented along with suggestions for managing the time and work required for such studies. A unique design flood is defined for each bridge as the flood whose upstream stage is equal to the lowest elevation of the approach fill or bridge deck. Two example reports were prepared to illustrate the application of the method to a rural site (low backwater damage) and an urban site (high potential traffic interruption and backwater damage). 17. Key Words and Document Analysis. 170. Descriptors 'Bridge design, Bridges, *Risks, Economic life, Highway effects, *Design flood, Flood drainage, Hydrographs, *project planning, Design data, Design, Backwater, Flow profiles, Hydraulics, 'Hydraulic design, Open channel flow 17b. Identifiers/Open-Ended Terms Risk analysis, Free board, Example- reports, Example studies, Backwater damage, Embankment damage, Traffic interruption, Repair costs 17c. COSATI Field/Group 18. Availability Statement 19._ Security Class (This 21. No. of Pages Document is available to the u.S. public through Re~~~Tt)1 A 142 the National Technical Information Service, "2:lr. Security Class (This 22. Price Springfield, Virainia 22161 Page UNCLASSIFIED ~--;- FORM NTls-a5 (REV. 10-73) ENDORSED BY ANSI AND UNESCO. Z-.:>sl,. THIS FORM MAY BE REPRODUCED USCOMM- DC 826!5-P74