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 = 1.524 m D = 1.524 m Bf = 2.44 m TAPER = 4.32:1 Sf = IV:2H L1 = 1.98 m L2 = 1.22 m L3 = 0.76 m Entrance: 26-degree to 90-degree wingwalls with no bevels. 100
. Example Problem #1 (English Units). The 50-year flood at the design site has a peak flow of 400 ft 3 /s. The ELhd of 195 ft is selected so that overtopping of the road-way will not occur for the design discharge. Given: Elevation of Outlet Invert: 172.5 ft Elevation of Shoulder: 196 ft Stream Bed Slope: 5 percent Approximate Culvert Length: 300 ft The Tailwater Variation is as Follows: Flow (ft 3 /s) T.W. (ft) 300 400 500 4.4 4.9 5.3 Requirements: Design the smallest possible barrel to pass the peak flow rate without exceeding the ELhd. The culvert will be located in a rural area with a low risk of damage. Underground utilities limit the available FALL to 2.5 ft. below the standard streambed elevation at the inlet. Use a reinforced concrete box culvert with n=0.012. Note: Charts 14B, 15B, 57B, 58B, and 59B are used in this solution. 101
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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
Page 66 and 67: NOTE: If the nomographs are put int
Page 68 and 69: Figure III-19--Critical Depth Chart
Page 70 and 71: (1) If the Manning’s n value give
Page 72: 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
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Page 125 and 126: 105
Page 127 and 128: c. Example Problem #2 (SI Units). F
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
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If headwater and flow consideration
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Figure VI-6--Subatmospheric Pressur
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Figure VI-7--Fish Baffles in Culver
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A popular method of providing for f
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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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