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Publication Number: FHWA-RD-06-138
Date: October 2006

Effects of Inlet Geometry on Hydraulic Performance of Box Culverts

APPENDIX B. INLET CONTROL COMPARISON CHARTS

This appendix includes all of the comparison charts used to evaluate the performance curves for various inlets tested under inlet control conditions. Charts from this appendix were selectively pulled into the text of the main body of this report to explain the analysis of data, but some of the charts included in this appendix showed such subtle differences that the authors chose not to overcomplicate the body of the report. Figures 94 through 100 are comparison graphs from experiments on the effects of fillets and bevels. Figures 101 through 122 are comparison graphs from experiments on the effects of multiple barrels. Figures 123 through 129 are comparison graphs from experiments on the effects of the span-to-rise ratio. Figures 130 and 131 are comparison graphs from experiments on the effects of skewed headwalls.

The following charts, figures 94 through 100, show the effects of fillets and bevel.

Figure 94. Graph. Inlet control, FC-S-0 and PC-A, no corner fillets.

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Figure 95. Graph. Inlet control, FC-S-0 and PC-A, 15.24-cm (6-inch) corner fillets.

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Figure 96. Graph. Inlet control, FC-S-0 and PC-A, 30.48-cm (12-inch) corner fillets.

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Figure 97. Graph. Inlet control, FC-S-30, FC-S-0, and PC-A.

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Figure 98. Graph. Inlet control, PC-A, 15.24- and 30.48-cm (6- and 12-inch) corner fillets.

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Figure 99. Graph. Inlet control, field cast hybrid inlet with 10.16-cm- (4-inch-)radius bevel on wingwalls.

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Figure 100. Graph. Inlet control, precast hybrid inlet with no bevel on wingwalls.

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The following charts, figures 101 through 122 show the effects of multiple barrels.

Figure 101. Graph. Inlet control, FC-S-0, FC-D-0, FC-T-0, and FC-Q-0.

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Figure 102. Graph. Inlet control, FC-S-0, FC-D-0-E, FC-T-0-E, and FC-Q-0-E.

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Figure 103. Graph. Inlet control, FC-S-30, FC-D-30, FC-T-30, and FC-Q-30.

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Figure 104. Graph. Inlet control, FC-S-30, FC-D-30-E, FC-T-30-E, and FC-Q-30-E.

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Figure 105. Graph. Inlet control, FC-S-0 and FC-S-30.

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Figure 106. Graph. Inlet control, FC-D-0 and FC-D-30.

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Figure 107. Graph. Inlet control, FC-T-0 and FC-T-30.

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Figure 108. Graph. Inlet control, FC-Q-0 and FC-Q-30.

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Figure 109. Graph. Inlet control, FC-D-0 and FC-D-0-E.

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Figure 110. Graph. Inlet control, FC-T-0 and FC-T-0-E.

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Figure 111. Graph. Inlet control, FC-Q-0 and FC-Q-0-E.

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Figure 112. Graph. Inlet control, FC-D-30 and FC-D-30-E.

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Figure 113. Graph. Inlet control, FC-T-30 and FC-T-30-E.

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Figure 114. Graph. Inlet control, FC-Q-30 and FC-Q-30-E.

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Figure 115. Graph. Inlet control, PC-A, PC-B, PC-C, and PC-D.

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Figure 116. Graph. Inlet control, PC-A, PC-B-E, PC-C-E, and PC-D-E.

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Figure 117. Graph. Inlet control, PC-B and PC-B-E.

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Figure 118. Graph. Inlet control, PC-C and PC-C-E.

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Figure 119. Graph. Inlet control, FC-S-30, FC-S-0, and PC-A.

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Figure 120. Graph. Inlet control, FC-D-30, FC-D-0, and PC-B.

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Figure 121. Graph. Inlet control, FC-T-30, FC-T-0, and PC-C.

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Figure 122. Graph. Inlet control, FC-Q-30, FC-Q-0, and PC-D.

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The following charts, figures 123 through 129 show the effects of the span-to-rise ratio.

Figure 123. Graph. Inlet control, FC-S-0, various span-to-rise ratios.

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Figure 124. Graph. Inlet control, FC-S-30, various span-to-rise ratios.

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Figure 125. Graph. Inlet control, PC-A, various span-to-rise ratios.

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Figure 126. Graph. Inlet control, FC-S-0, FC-S-30, and PC-A, 1:1 span-to-rise ratio.

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Figure 127. Graph. Inlet control, FC-S-0, FC-S-30, and PC-A, 2:1 span-to-rise ratio.

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Figure 128. Graph. Inlet control, FC-S-0, FC-S-30, and PC-A, 3:1 span-to-rise ratio.

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Figure 129. Graph. Inlet control, FC-S-0, FC-S-30, and PC-A, 4:1 span-to-rise ratio.

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The following charts, figures 130 and 131, show the effects of skewed headwalls.

Figure 130. Graph. Inlet control, FC-T-30 at various headwall skews.

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Figure 131. Graph. Inlet control, FC-S-30, 0- and 30-degree skews.

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The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT).
The Federal Highway Administration (FHWA) is a part of the U.S. Department of Transportation and is headquartered in Washington, D.C., with field offices across the United States. is a major agency of the U.S. Department of Transportation (DOT). The hydraulics and hydrology research program at the TFHRC Federal Highway Administration's (FHWA) R&T Web site portal, which provides access to or information about the Agency’s R&T program, projects, partnerships, publications, and results.
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