Hydraulic Efficiency of Grate and Curb Inlets - Urban Drainage and ...

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Table 4-1: Sample on-grade test data Test ID Number Configuration Longitudinal Slope (%) Cross Slope (%) Flow Depth (ft) Prototype Total Flow (cfs) Efficiency (%) Top Width at Control (ft) Top Width Downstream of Inlets (ft) 56 Triple No. 13 0.5 1 0.333 4.4 82.1 15.8 9.0 57 Triple No. 13 0.5 1 0.501 20.6 43.2 18.2 18.2 58 Triple No. 13 0.5 1 0.999 126.6 22.7 18.2 18.2 59 Double No. 13 0.5 1 0.333 4.7 73.3 16.0 10.7 60 Double No. 13 0.5 1 0.501 22.6 35.9 18.2 18.2 61 Double No. 13 0.5 1 0.999 127.8 16.2 18.2 18.2 62 Single No. 13 0.5 1 0.333 4.8 61.3 16.0 15.8 63 Single No. 13 0.5 1 0.501 26.2 23.8 18.2 18.2 64 Single No. 13 0.5 1 0.999 126.4 9.9 18.2 18.2 For illustration purposes, trend lines are fitted to the on-grade test data (as second-order polynomials) in Figure 4-1 through Figure 4-3. Each trend line illustrates how efficiency increases with increasing inlet length. Velocity was chosen as the independent variable in these figures because of its significant effect on inlet efficiency. Figure 4-1: Type 13 combination-inlet on-grade test data 46
Figure 4-2: Type 16 combination-inlet on-grade test data Figure 4-3: Type R curb inlet on-grade test data Several general trends can be found in the on-grade test data: • The highest inlet efficiency occurs at the lowest flow velocity. • The velocity of flow is influenced by the longitudinal and cross slopes, and lower slopes produce lower velocity. • Flow on the model street section was almost always supercritical 47
Page 1:
HYDRAULIC EFFICIENCY OF GRATE AND C
Page 5 and 6:
TABLE OF CONTENTS LIST OF FIGURES .
Page 7 and 8:
LIST OF FIGURES Figure 1-1: Map of
Page 9 and 10:
Figure 5-7: Predicted vs. observed
Page 11 and 12:
LIST OF TABLES Table 2-1: Summary o
Page 13 and 14: LIST OF SYMBOLS, UNITS OF MEASURE,
Page 15 and 16: S c , Sc, cross slope cross (or lat
Page 17 and 18: ID mag meter No. QC ® R5 R9 R12 R1
Page 19 and 20: 1 INTRODUCTION A research program w
Page 21 and 22: 1-1 often require use of these thre
Page 23 and 24: 2 LITERATURE REVIEW Urban storm dra
Page 25 and 26: • All grates showed patterns of i
Page 27 and 28: Q = Q w + Q s Equation 2-1 where: 2
Page 29 and 30: Inlet Name Bar P-1-7/8 Bar P-1-7/8-
Page 31 and 32: 2.2.3 Curb Opening Inlets Curb open
Page 33 and 34: 2.3 Manning’s Equation Uniform fl
Page 35 and 36: where: q 1 = dependent parameter; q
Page 37: Q ⎛ L L Qw ⎞ = f ⎜ , ⎟ Equa
Page 40 and 41: Headbox Pipe Network Inlets Street
Page 42 and 43: capacity. A similar study performed
Page 44 and 45: Table 3-3: Test matrix for 0.33-ft
Page 46 and 47: Table 3-5: Test matrix for 1-ft pro
Page 48 and 49: Solid Plexiglas ® was milled to pr
Page 50 and 51: Figure 3-10: Triple No. 13 combinat
Page 52 and 53: Figure 3-16: Single No. 16 combinat
Page 54 and 55: Figure 3-22: Single No. 16 combinat
Page 56 and 57: Note Safety Bar Figure 3-28: R5 wit
Page 58 and 59: Flow entering and exiting the model
Page 60 and 61: Following a standardized testing pr
Page 63: 4 DATA AND OBSERVATIONS Testing res
Page 67 and 68: 45 40 35 Captured flow (cfs) 30 25
Page 69 and 70: 5 ANALYSIS AND RESULTS Data selecte
Page 71 and 72: likely due to the nature of the ori
Page 73 and 74: 1 Observed 0.9 0.8 0.7 0.6 0.5 0.4
Page 75 and 76: Total flow (Q) is known from the ob
Page 77 and 78: Observed 1 0.9 0.8 0.7 0.6 0.5 0.4
Page 79 and 80: 1 0.9 Observed 0.8 0.7 0.6 0.5 0.4
Page 81 and 82: The second Pi group is the square o
Page 83 and 84: Table 5-2: Empirical equations for
Page 85 and 86: Agreement is best at the smallest f
Page 87 and 88: Efficiency/base efficiency 2.2 2 1.
Page 89 and 90: were typically seen at higher flow
Page 91 and 92: Average difference in calculated ef
Page 93: Depth (ft) Table 5-3: Efficiency er
Page 96 and 97: test data for typical design depths
Page 98 and 99: Observed efficiency 1 0.9 0.8 0.7 0
Page 101: 7 REFERENCES Bos, M. G. (1989). Dis
Page 105 and 106: (P-1-7/8 grate does not have the 10
Page 107 and 108: Figure A-3: Curved vane grate (UDFC
Page 109 and 110: Figure A-5: 30º-tilt bar grate (UD
Page 111: APPENDIX B ON-GRADE TEST DATA 93
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Test ID Number Configuration Table
Page 116 and 117:
Table B-3: 2% and 1% on-grade test
Page 118 and 119:
Test ID Number Configuration Longit
Page 120 and 121:
Test ID Number Configuration Table
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Table B-7: Additional debris tests
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106
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For the additional sump tests, only
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110
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(a) (b) Figure D-2: Type 16 inlet s
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(a) (b) (c) Figure D-4: Type R curb
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116
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Extent of Flow Station (x) Position
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120
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Test ID Number depth (ft) Tw (ft) A
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Table F-2: Additional parameters fo
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Page 146 and 147:
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130
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132
Page 152 and 153:
Plot of rstudent*pred. Legend: A =
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The REG Procedure Model: MODEL1 Dep
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Plot of logE*pred. Legend: A = 1 ob
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Plot of rstudent*pred. Legend: A =
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142
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144
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Test ID Number Depth (ft) Grates Fl
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Test ID Number Depth (ft) Grates Fl
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Test ID Number Depth Length Flow Ef
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Hydraulic Efficiency of Grate and Curb Inlets - Urban Drainage and ...

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