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HYDRAULIC DESIGN OF IMPROVED INLETS FOR CULVERTS

Conventional culvert hydraulics are reviewed, the types of improved inlets are discussed, terms are defined, and design procedures for box and pipe culverts with improved entrances are presented. Inlet geometry refinements refinements described here include bevel-edged, side- tapered, and slope-tapered inlets. Performance curves are presented and discussed. Four inlet control charts for culverts with beveled edges are included, and box bulvert multibarrel installations (bevel-edged inlets) are described. The selected configurations of the side- tapered inlet are shown. Side taper ratios may range from 6:1 to 4:1. The latter is recommended as it results in a shorter inlet. The Vertical Face and Mitered Face are variations of the slope tapered inlet which provide additional improvements in hydraulic performance by increasing the head on the control section. For each degree of pipe culvert inlet improvement, there are many possible variations using bevels, tapers, drops, and combinations of the three. The tapered inlets are classified as either side-tapered (flared) or slope-tapered. The side tapered inlet for pipe culverts is designed in a manner similar to that used for a side tapered box culvert inlet. The slope-tapered design for pipes utilizes a rectangular inlet with a transition section between the square and round throat sections. Details of the design procedure are described and design charts are provided.

Media Info

  • Features: Appendices;
  • Pagination: 172 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00134645
  • Record Type: Publication
  • Report/Paper Numbers: Hyd Eng Crcl No. 13
  • Files: TRIS, USDOT
  • Created Date: Jun 23 1976 12:00AM