USE OF STREAM-FLOW RECORDS IN DESIGN OF BRIDGE WATERWAYS

THE MOST LOGICAL BASIS FOR DESIGN OF A STRUCTURE THAT IS TO PROVIDE PASSAGE FOR THE "WATER TRAFFIC" IS THE DEFINITE RECORD OF THAT TRAFFIC, STREAM-FLOW RECORDS. TO CALCULATE PROPERLY THE SIZE OF A BRIDGE OPENING REQUIRES AMONG OTHER THINGS, A KNOWLEDGE OF THE PHYSICAL CHARACTERISTICS OF THE STREAM AND ITS CHANNEL, THE RELATION OF THE ELEVATION OF WATER SURFACE TO THE DISCHARGE, AND THE MAGNITUDE AND FREQUENCY OF OCCURRENCE OF FLOOD DISCHARGES. FROM THIS INFORMATION THE FACTORS TO BE COMPUTED ARE: THE DROP IN WATER SURFACE BETWEEN A SELECTED CROSS SECTION IN THE APPROACH CHANNEL AND THE BRIDGE SITE, THE DROP IN WATER SURFACE THROUGH THE BRIDGE, THE AMOUNT OF BACKWATER CAUSED BY BRIDGE, AND THE VELOCITIES THAT WILL BE PRODUCED. THE RESULTS OF THESE COMPUTATIONS, REDUCED TO A FAMILY OF CURVES, FURNISH A BASIS FOR SELECTION OF THE PROPER SIZE OF BRIDGE OPENING. THE FINAL SELECTIONS SHOULD BE GOVERNED BY THE POLICY CONTROLLING THE DESIGNING ENGINEER IN RESPECT TO FREQUENCY, HYDRAULIC REQUIREMENTS, FACTOR OF SAFETY, AND ECONOMIC CONSIDERATIONS. /AUTHOR/

• Record URL:
  https://onlinepubs.trb.org/Onlinepubs/hrbproceedings/26/26-013.pdf
• Supplemental Notes:
  • Vol 26, pp 163-179, 7 FIG, TABS. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved.
• Authors:
  • Dalrymple, T
  • Rowe, R R
  • Winslow, W S
  • Williams, G R
• Publication Date: 1947

Media Info

• Media Type: Digital/other
• Monograph Title: Proceedings of the Twenty-Sixth Annual Meeting of the Highway Research Board Held at Washington, D.C. December 5-8, 1946
• Serial:
  • Highway Research Board Proceedings
  • Volume: 26
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Bridge waterways; Cross sections; Floods; Flow; Streamflow; Streams
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204360
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: May 29 1972 12:00AM