TESTS ON CIRCULAR-PIPE-CULVERT INLETS

THE EFFECT OF VARIOUS TYPES OF INLETS ON FLOW THROUGH SHORT MODEL CIRCULAR PIPE CULVERTS WAS INVESTIGATED. TESTS WERE CONDUCTED ON THE FOLLOWING INLETS: (1) SQUARE EDGED FLUSH INLETS WITH FLARED WINGWALLS, WITH STRAIGHT WINGWALLS AND WITH PARALLEL WINGWALLS, (2) THIN WALLED PROJECTING INLET, (3) MITERED SHARP-EDGED INLET, (4) MITERED ROUNDED INLET, (5) TONGUE AND GROOVE PROJECTING INLET, AND (6) ROUNDED PROJECTING INLET. TEST DISCHARGES WERE INCREASED FROM A MINIMUM UP TO THE CAPACITY OF THE FLUME. TESTS WERE RUN TO DETERMINE THE INFLUENCE OF INLETS ALONE ON THE DISCHARGE CAPACITY OF THE PIPE. TEST RESULTS ON THE VARIOUS TYPES OF PIPE INLET WITH THE PIPE UNDER FREE OUTFALL CONDITIONS SHOW THAT: (1) IN CONCRETE PIPE CULVERTS, IT REDUCES THE EFFICIENCY OF THE CULVERT TO MITER THE UPSTREAM END AS COMPARED TO THE SQUARE-ENDED INLET PLACING THE GROOVE END OF A TONGUE AND GROOVE PIPE UPSTREAM. (2) ONLY TWO TYPES OF INLETS TESTED, THE GROOVE-PROJECTING INLET AND THE ROUNDED-PROJECTING INLET, SHOWED THAT THE CULVERTS WOULD FLOW FULL DEPENDING UPON INLET CONTROL CONDITIONS WHEN HEIGHT/DIAMETER WAS LESS THAN 3.7, AND THESE FLOWED FULL ONLY WHEN HEIGHT/DIAMETER WAS GREATER THAN ABOUT 1.5, AND (3) THE SHARP-EDGED PROJECTING INLET AND THE MITERED SHARP- EDGED INLET ARE NOT AS EFFICIENT AS THE SQUARE-EDGED FLUSH INLET.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/hrbbulletin/126/126-002.pdf
• Supplemental Notes:
  • No 126, pp 11-23, 13 FIG, 3 REF 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:
  • Schiller Jr, R E
• Discussers:
  • French, John L
• Publication Date: 1956

Media Info

• Monograph Title: Culvert-flow characteristics
• Serial:
  • Highway Research Board Bulletin
  • Issue Number: 126
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Concrete pipe; Culvert inlets; Flow; Flumes; Pavement grooving; Pipe culverts; Shape; Streamflow; Water
• Uncontrolled Terms: Capacity; Configuration; Inlets; Model tests
• Old TRIS Terms: Discharge
• Subject Areas: Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00204183
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Apr 21 1994 12:00AM