00677734

Component

http://onlinepubs.trb.org...trr/1994/1471/1471-003.pdf

https://scholar.google.co...nroe&publication_year=1994

On highway reconstruction projects the Kansas Department of Transportation now fits pipe culverts with end sections designed specifically for collision safety. These safety end sections are long and narrow with steel bars over the top openings. Scale models of 10 safety end sections were tested in a large water flume in the hydraulics laboratory at the University of Kansas. The objectives were to determine the relationship between headwater depth and discharge (the rating curve) under inlet control, the entrance-loss coefficient for full flow, and the susceptibility to blockage by debris for each design. The hydraulic characteristics of the safety end sections compare favorably with those of standard end sections. The inlet-control rating curves are described by a simple dimensionless relationship. Entrance-loss coefficients for full flow range from 0.65 to 0.85. At headwater depths greater than 1.4 times the pipe diameter, a concrete culvert with safety end sections will always flow full. At headwater depths greater than 2.0 times the pipe diameter, a corrugated steel culvert with safety end sections will always flow full. Most safety end sections are not particularly susceptible to blockage by floating debris. Debris seldom obstructs more than about one-fourth of the area of the top opening at high flows.

This paper appears in Transportation Research Record No. 1471, Recent Research on Hydraulics and Hydrology. 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

01396802

English

p. 18-23

1994

Transportation Research Record

0309061040

Figures (4) ; References (9) ; Tables (1)

Debris removal; Flow; Hydraulics; Hydrologic phenomena; Pipe culverts

Blockage; Debris; Headwater depth; Model tests

Highways; Hydraulics and Hydrology; I26: Water Run-off - Freeze-thaw

TRIS, TRB

May 22 1995 12:00AM

• CORRELATION OF PAVEMENT SURFACE TEXTURE TO HYDRAULIC ROUGHNESS
• DEVELOPING EROSION CONTROL PLANS FOR HIGHWAY CONSTRUCTION
• DEVELOPMENT OF REGIONALIZED CURVES FOR DRAINAGE AREA VERSUS SEDIMENT BASIN SIZE
• FLOOD ANALYSIS IN DUPAGE COUNTY USING HYDROLOGICAL SIMULATION PROGRAM--FORTRAN MODEL
• HYDROLOGIC ENGINEERING CENTER MODELS FOR URBAN HYDROLOGIC ANALYSIS
• IMPROVEMENTS IN CURB-OPENING AND GRATE INLET EFFICIENCY
• MULTILANE HIGHWAY DESIGN CROSSFALL AND DRAINAGE ISSUES
• SCOUR AROUND WIDE PIERS IN SHALLOW WATER
• SMALL URBAN WATERSHED USE OF HYDROLOGIC PROCEDURES
• URBAN HYDROLOGY DESIGN USING SOIL CONSERVATION SERVICE TR-55 AND TR-20 MODELS