DESIGN CRITERIA FOR CONTROLLED SCOUR AND ENERGY DISSIPATION AT CULVERT OUTLETS USING ROCK AND A SILL
DESIGN TABLES HAVE BEEN PREPARED, ON THE BASIS OF LABORATORY STUDIES, WITH 1.75-, 3-, AND 6-IN. DIAMETER CULVERT MODELS ON A ZERO SLOPE WITH A LOW TAIL-WATER. MODELS OF STANDARD END FLARES WERE USED TO SIMULATE THE CULVERT OUTLET CONDITIONS. STABLE ROCK SIZES AND BASIN GEOMETRY CAN BE DETERMINED BY USING THE DESIGN TABLES DEVELOPED IN THE STUDY. THE DESIGN TABLES PROVIDE DATA FOR FLOWS UP TO A DISCHARGE FACTOR OF 13.5 AND ARE APPLICABLE FOR ANGULAR ROCK AS WELL AS ROUNDED ROCK. THE TABLES ARE USED IN EXAMPLES FOR DESIGN OF ROCK BASINS FOR NO-SCOUR SITUATIONS AND CONTROLLED DEPTHS OF SCOUR. THE STUDY CONCLUDES THAT THE ROCK BASIN SHOULD HAVE A WIDTH OF AT LEAST 3 PIPE DIAMETERS AND DIVERGENCE ANGLES OF 1:3 WHEN NO SILL IS USED AND 1:1.75 WHEN A SILL IS USED. THE LENGTH OF THE BASIN IS DEPENDENT ON THE CULVERT DISCHARGE, CULVERT DIAMETER, SIZE OF ROCK, EXTENT OF PERMISSIBLE SCOUR, AND USE OF A SILL. THE SILL OF THIS STUDY WAS PLACED AT THE FLARED END AND WAS 1 DIAMETER LONG AND 0.3 DIAMETER HIGH. THE TABLES, BY MEANS OF DIMENSIONLESS PARAMETERS, MAKE IT POSSIBLE TO SELECT THE PROPER SIZED ROCK TO REALIZE A SELECTED VELOCITY REDUCTION AND A DEGREE OF SCOUR CONTROL. /AUTHOR/
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Supplemental Notes:
- Sponsored by Committee on Surface Drainage of Highways and presented at the 50th Annual Meeting. 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
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Authors:
- Thorson, Donald A
- Shirole, Arunprakash M
- Karim, Mansour
- Publication Date: 1971
Media Info
- Media Type: Print
- Features: Figures; References; Tables;
- Pagination: pp 39-51
- Monograph Title: Design of culverts, energy dissipators and filter systems
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Serial:
- Highway Research Record
- Issue Number: 373
- Publisher: Highway Research Board
Subject/Index Terms
- TRT Terms: Culvert outlets; Culverts; Design; Dissipation; Flow; Geometry; Mathematical models; Rocks; Scour
- Uncontrolled Terms: Design criteria; Models
- Old TRIS Terms: Basins; Sills
- Subject Areas: Bridges and other structures; Design; Energy; Geotechnology; Highways; Hydraulics and Hydrology;
Filing Info
- Accession Number: 00204433
- Record Type: Publication
- Files: TRIS, TRB
- Created Date: Apr 23 1972 12:00AM