Hydraulic Design of Highway Culverts - DOT On-Line Publications

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Conclusions: Use a slope-tapered inlet with a vertical face since it is the smallest inlet in this case. Note that since the Fall is less than D/2, a slope-tapered inlet with a mitered face cannot be used at this site. Dimensions: B = 5 ft D = 5 ft Bf = 8 ft TAPER = 4.33:1 Sf = IV:2H L1 = 6.5 ft L2 = 4.0 ft L3 = 2.5 ft Entrance: 26-degree to 90-degree wingwalls with no bevels. 106
c. Example Problem #2 (SI Units). From example problem no. 4, Chapter III, an existing 2134 mm by 2134 mm concrete box culvert was originally designed for a 50-year flood of 16.990 m 3 /s and an ELhd of 34.747 m. Upstream development has increased the 50-year runoff to 28.317 m 3 /s. Given: Inlet Invert Elevation: 30.480 m Existing Entrance Condition: Square edge Barrel Slope (S): 5 percent Roadway Centerline Elevation: 35.204 m Culvert Length: 60.960 m Flow, m 3 /sec T.W. (m) 22.654 28.317 33.980 1.16 1.25 1.37 Requirements: In order to save the existing culvert barrel, design a new side-tapered inlet that will pass the new 50-year runoff of 28.317 m 3 /s at the original ELhd of 34.747 m. The sidetapered inlet will be constructed upstream of the existing barrel. Prepare outlet control, throat control, and face control performance for the new inlet. Note: Charts 14A, 15A, 57A, and 58A, are used in this solution. 107
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Publication No. FHWA-NHI-01-020 Sep
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Acknowledgements This document’s
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TABLE OF CONTENTS (Cont.) III. CULV
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TABLE OF CONTENTS (Cont.) F. Safety
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LIST OF FIGURES (Cont.) Figure III-
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LIST OF TABLES Table 1. Factors Inf
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ELhf ELhi ELho ELht ELO ELsf ELSO E
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GLOSSARY (Cont.) p Wetted perimeter
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B. Overview of Culverts A culvert i
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Figure I-9--Side-tapered inlet Figu
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. Partly Full (Free Surface) Flow.
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Table 1--Factors Influencing Culver
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D. Economics The hydraulic design o
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For gaged sites, statistical analys
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volume of the remaining runoff hydr
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Figure II-4--Flood hydrograph shape
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Figure II-6--Cross section location
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. Culvert Length. Important dimensi
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HYDROLOGY Peak Flow Check Flows Tab
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Figure III-1--Types of inlet contro
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Figure II-2--Flow contractions for
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The flow transition zone between th
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Figure III-6--Culvert with Inlet Su
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Condition III-7-A represents the cl
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Outlet control flow conditions can
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2 2 Vu Vd HW o + = TW + + HL (6) 2g
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This approximate method works best
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Figure III-12--Weir Crest Length De
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Critical depth is used when the tai
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4. Add the culvert flow and the roa
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NOTE: If the nomographs are put int
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Figure III-19--Critical Depth Chart
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(1) If the Manning’s n value give
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Example Problem #1 (SI Units) A cul
Page 80 and 81: Example Problem #2 (SI Units) A new
Page 82 and 83: Example Problem #3 (SI Units) Desig
Page 84: Example Problem #4 (SI Units) An ex
Page 88 and 89: CHART 51A Figure III-21--Inlet Cont
Page 90 and 91: 2. Outlet Control. a. Partly Full F
Page 92 and 93: Backwater Calculations From hydraul
Page 95 and 96: English Units INLET CONTROL: AD 0.
Page 99 and 100: A. Introduction IV. TAPERED INLETS
Page 101 and 102: height by more than 10 percent (1.1
Page 103 and 104: A slope-tapered inlet has three pos
Page 105 and 106: The mitered face slope-tapered inle
Page 107 and 108: La is the approximate length of the
Page 109 and 110: E. Design Methods Figure IV-9--Tape
Page 111 and 112: a. Complete Design Data. Fill in th
Page 113 and 114: H 1 i. For FALL < D/4, use side-tap
Page 115: 3. Example Problems a. Example Prob
Page 121 and 122: . Example Problem #1 (English Units
Page 123 and 124: 103
Page 125: 105
Page 129 and 130: Conclusions: A side-tapered inlet a
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Page 133 and 134: G. Circular Pipe Culverts 1. Design
Page 135 and 136: Double barrel slope-tapered inlets
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Page 139 and 140: . Example Problem #3 (English Units
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Page 143 and 144: A. The Routing Concept V. STORAGE R
Page 145 and 146: C. Application to Culvert Design Fi
Page 147 and 148: Figure V-6--Peak Flow Reduction Bas
Page 149 and 150: I + I + ( 2s / ∆t − O) = ( 2s /
Page 151 and 152: Table 5--Inflow Hydrograph, Example
Page 153 and 154: Figure V-10—Culvert Design Form f
Page 155 and 156: Figure V-14--Storage vs. Outflow Re
Page 157 and 158: Table 5 --Inflow Hydrograph, Exampl
Page 159 and 160: Figure V-18--Culvert Design Form fo
Page 161 and 162: Figure V-22--Storage vs. Outflow Re
Page 163 and 164: A. Introduction VI. SPECIAL CONSIDE
Page 165 and 166: With minor modifications, the culve
Page 167 and 168: If headwater and flow consideration
Page 169 and 170: Figure VI-6--Subatmospheric Pressur
Page 171 and 172: Figure VI-7--Fish Baffles in Culver
Page 173 and 174: A popular method of providing for f
Page 175 and 176: passage of the peak flow. Methods f
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Figure VI-15--Sediment Deposition i
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1. Skewed Barrels. The alignment of
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Skewed inlets slightly reduce the h
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arrel for pipes or the flow per met
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Culvert shapes are as important in
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• Flood plain ordinances or other
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Figure VI-28--Guardrail Adjacent to
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Both of the above equations are emp
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Tables, charts, and formulas are av
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3. Endwalls and Wingwalls. Culvert
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2. Hydraulic Considerations. Long s
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conditions. Variations in the concr
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REFERENCES (www.fhwa.dot.gov/bridge
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28. "Design Approaches for Stormwat
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54. "Hydraulic Analysis of Pipe-Arc
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ADDITIONAL REFERENCES (In Alphabeti
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"Risk Analysis For Hydraulic Design
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A. Introduction APPENDIX A DESIGN M
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Chart No. 1 Shape and Material Circ
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NOTE: The rest of this Appendix A i
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Figure A-1--Dimensionless Performan
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developed for circular and elliptic
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APPENDIX B HYDRAULIC RESISTANCE OF
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D. Corrugated Metal Culverts The hy
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Curves are shown for 2-2/3 by 1/2 i
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F. Spiral Rib Pipe Spiral rib pipe
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APPENDIX C CULVERT DESIGN OPTIMIZAT
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C. Inlet Control Performance Curves
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Figure C-4--Optimization of Perform
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E. Tapered Inlet Face Control Perfo
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APPENDIX D DESIGN CHARTS, TABLES, A
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Chart Corrugated Metal Box Culverts
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Chart Circular Tapered Inlets 55A,
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Table 12--Entrance Loss Coefficient
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CHART 1B 225
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