TAPERED BOX CULVERT INLETS WITH FALL CONCENTRATION IN THE INLET STRUCTURE

THE HYDRAULIC CAPACITIES OF TAPERED INLETS TO BOX CULVERT BARRELS, WITHIN WHICH A SUBSTANTIAL FALL OF THE INVERT GRADE IS PROVIDED BY SLOPING THE INLET, WERE INVESTIGATED FOR A RANGE OF POSSIBLE INLET FORMS. SCALE MODELS WERE USED TO DETERMINE DISCHARGE CAPACITY OF THESE INLETS OPERATING WITH CONTROL AT THE FACE SECTION, AT THE THROAT SECTION AND AT INTERMEDIATE CONTROL SECTIONS. THE RESULTS ARE EXPRESSED IN THE FORM OF ENERGY EQUATIONS RELATING THE RATE OF FLOW TO DIMENSIONS AND FORM OF THE CONTROL SECTION BY USE OF DISCHARGE COEFFICIENTS. THE REPORT SHOWS THAT TAPERED AND SLOPED INLETS CAN PROVIDE SUBSTANTIAL INCREASES OF DISCHARGE CAPACITY OVER THAT OF A CONVENTIONAL BOX CULVERT OF EQUAL BARREL SIZE AT AN EQUAL DEPTH OF HEADWATER, THE DEGREE OF INCREASE DEPENDING UPON THE FALL FROM INLET CREST TO THROAT AND THE RELATIVE DEPTH OF HEADWATER. /AUTHOR/

• Supplemental Notes:
  • Cpr 11-6528, 213.32/2130436
• Corporate Authors:

  National Bureau of Standards /US

  /Fluid Mechanics Branch
  ,   United States 

  Bureau of Public Roads /US

  400 7th Street, SW
  Washington, DC  United States  20590
• Authors:
  • French, J L
  • Bossy, H G
• Publication Date: 1967-7

Subject/Index Terms

• TRT Terms: Box culverts; Culvert inlets; Energy; Equations; Flow; Hydraulics; Mathematical models; Ratios; Slopes; Tapered traffic lanes
• Uncontrolled Terms: Inlets; Models
• Old TRIS Terms: Discharge rate; Scale (Ratio); Taper
• Subject Areas: Energy; Highways; Hydraulics and Hydrology;

Filing Info

• Accession Number: 00203971
• Record Type: Publication
• Source Agency: Bureau of Public Roads /US
• Files: TRIS
• Created Date: Jan 8 1994 12:00AM