00713561

Component

http://onlinepubs.trb.org...trr/1995/1483/1483-009.pdf

https://scholar.google.co...nson&publication_year=1995

The most common end sections for pipe culverts are the shop-fabricated metal end sections and precast concrete end sections available from pipe suppliers. However, the standard reference works on culvert hydraulics provide little information on their hydraulic performance. The hydraulic characteristics of common flared end sections were recently investigated in model tests conducted at the University of Kansas for the Kansas Department of Transportation. Inlet-control rating curves were developed and entrance-loss coefficients for metal and concrete flared end sections of all sizes were determined. The hydraulic effects of floating debris were investigated and some potential design improvements tested. Under inlet control, standard flared end sections perform much better than mitered pipes, slightly better than headwalls with sharp inlet edges, and slightly worse than headwalls with grooved or rounded inlet edges. The concrete flared end sections are slightly more efficient than the metal end sections. Entrance-loss coefficients for flared end sections range from 0.24 to 0.30. Floating debris has little effect on the hydraulic performance of the flared end sections under inlet control. However, an accumulation of debris alters the flow pattern in a way that can cause a shift from inlet control to full flow, a more efficient operating condition. The hydraulic performance of a flared inlet can be improved by adding several bars across the top third of the inlet opening. These "flow bars" have the same beneficial hydraulic effects as an accumulation of debris at the inlet.

This paper appears in Transportation Research Record No. 1483, 1993 Midwest Floods and Water Quality Best Management Practices. 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

01399791

English

p. 72-79

1995

Transportation Research Record

Figures (10) ; References (8) ; Tables (3)

Culverts; Debris removal; Flow; Flow control (Air traffic control); Hydraulics; Performance evaluations; Pipe culverts

Debris; Flow patterns; Model tests

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

TRIS, TRB

Nov 16 1995 12:00AM

• CORRELATIONS BETWEEN HEAVY METALS AND SUSPENDED SOLIDS IN HIGHWAY RUNOFF: IMPLICATIONS FOR CONTROL STRATEGIES
• CURRENT WATER QUALITY BEST MANAGEMENT PRACTICES DESIGN GUIDANCE
• EFFECTS OF FEDERAL LEVEES AND RESERVOIRS ON 1993 FLOOD STAGES IN ST. LOUIS
• EFFECTS OF STORM WATER REGULATIONS ON COLORADO DEPARTMENT OF TRANSPORTATION
• ENHANCING CONTAMINANT REMOVAL IN STORMWATER DETENTION BASINS BY COAGULATION
• IMPACTS OF 1993 UPPER MISSISSIPPI RIVER BASIN FLOODS ON HIGHWAY SYSTEMS
• JULY 1993 FLOOD DAMAGE TO US-71 BRIDGE OVER BRUSHY CREEK, CARROLL COUNTY, IOWA: CASE STUDY
• MAGNITUDE AND FREQUENCY OF 1993 FLOOD VOLUMES IN UPPER MISSISSIPPI RIVER BASIN
• MAGNITUDE AND FREQUENCY OF PEAK DISCHARGES FOR MISSISSIPPI RIVER BASIN FLOOD OF 1993
• MOBILIZATION OF MAJOR AND TRACE CONSTITUENTS OF HIGHWAY RUNOFF IN GROUNDWATER POTENTIALLY CAUSED BY DEICING CHEMICAL MIGRATION
• NATIONAL EVALUATION OF WATER QUALITY ISSUES FOR HIGHWAY PLANNING
• SCOUR MEASUREMENTS AT BRIDGE SITES DURING 1993 UPPER MISSISSIPPI RIVER BASIN FLOOD
• SELECTION OF FLOOD FREQUENCY ANALYSIS PROCEDURE FOR EVALUATING FLOOD-ESTIMATION MODELS
• WATER LEVEL STATISTICS FOR DESIGN OF TRANSPORTATION FACILITIES IN COASTAL LOUISIANA