Bridge Design Manual. Hydraulic Design

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The newer FIRMs delineate both rating zones and floodways. Depending on the publication date of the flood insurance study, it may be necessary to look at either a FBFM or a FIRM to determine whether the project lies within a regulatory floodway. For all communities for which a flood insurance study has been performed, the maps that include a portion of the project should be checked to determine if the project is within a special flood hazard area. If so, a floodplain development permit is required.

The flood channel must extend far enough upstream and downstream of the bridge to establish the desired flow regime through the affected reach. Stabilization of the flood channel to prevent erosion and scour should be considered. 5 Hydraulic Analysis of Culverts The FHWA HY-8 computer program shall be used for the analysis and design of culverts. The hydraulic design of highway culverts is based on the theory and procedures presented in Hydraulic Design of Highway Culverts - HDS No. 5 (12). Flow Type A culvert barrel may flow full over its entire length or may flow partly full.

1 List of References 1. Stream Stability at Highway Structures, Federal Highway Administration Publication FHWA-IP-90-014 - Hydraulic Engineering Circular No. 20, November 1995 2. AASHTO Highway Drainage Guidelines, American Association of State Highway and Transportation Officials, 1992 3. Guidelines for Determining Flood Flow Frequency, United States Water Resources Council, Bulletin #17B of the Hydrology Committee, September 1981 4. Technique for Estimating the 2- to 500-Year Flood Discharges on Unregulated Streams in Rural Missouri, Alexander and Wilson, USGS Water-Resources Investigations Report 95-4231, 1995 5.

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