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

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HYDRAULIC EFFICIENCY OF GRATE AND CURB INLETS FOR URBAN STORM DRAINAGE Prepared for The Urban Drainage and Flood Control District . Prepared by Brendan C. Comport Christopher I. Thornton Amanda L. Cox December 2009 Colorado State University Daryl B. Simons Building at the Engineering Research Center Fort Collins, CO 80523
Page 1: HYDRAULIC EFFICIENCY OF GRATE AND C
Page 6 and 7: 5.6 Summary........................
Page 8 and 9: Figure 3-21: Single No. 16 combinat
Page 10 and 11: Figure D-1: Type 13 inlet specifica
Page 12 and 13: Table C-1: Sump test data..........
Page 14 and 15: m number of dimensions required to
Page 16 and 17: Π Φ Pi parameter for dimensional
Page 18 and 19: xiv
Page 20 and 21: USDCM for determining inlet efficie
Page 22 and 23: Objectives of this project were to:
Page 24 and 25: Table 2-1: Summary of FHWA model ch
Page 26 and 27: 2.2.1 On-grade Conditions On-grade
Page 28 and 29: where: S w = gutter cross slope (ft
Page 30 and 31: Constants in Equation 2-8 are assoc
Page 32 and 33: function of street characteristics
Page 34 and 35: where: V = cross-sectional average
Page 36 and 37: un-depressed grate inlet with longi
Page 39 and 40: 3 HYDRAULIC MODELING Testing was pe
Page 41 and 42: of test conditions likely to be enc
Page 43 and 44: 3.2 Conditions Tested A test matrix
Page 45 and 46: Table 3-4: Test matrix for 0.5-ft p
Page 47 and 48: construction methods were utilized
Page 49 and 50: the grate portion of a combination
Page 51 and 52: Figure 3-13: Single No. 13 curb ope
Page 53 and 54:
Note Reducing Plate Figure 3-19: Si
Page 55 and 56:
Figure 3-25: R12 curb inlet photogr
Page 57 and 58:
39 Figure 3-29: Model schematic
Page 59 and 60:
Table 3-8: Empirically-derived weir
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3.5 Summary A testing program desig
Page 64 and 65:
Table 4-1: Sample on-grade test dat
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• The inlet efficiency appears to
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45.0 40.0 35.0 Captured flow (cfs)
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On-grade test data Directly calcula
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1 0.9 Observed 0.8 0.7 0.6 0.5 0.4
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the model was often either lower or
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Table 5-1: Updated splash-over velo
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Efficiency for the Type R curb inle
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From a design perspective, a user a
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less than 0.0001 (the minimum level
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Observed 1 0.9 0.8 0.7 0.6 0.5 0.4
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Empirical 1 0.9 0.8 0.7 0.6 0.5 0.4
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Efficiency/base efficiency 2 1.8 1.
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5.5 Relevance of Uniform Flow in Da
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5.6 Summary The current state-of-th
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6 CONCLUSIONS AND RECOMMENDATIONS 6
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Observed efficiency 1 0.9 0.8 0.7 0
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design characteristics, higher effi
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APPENDIX A USDCM GRATE INLET SCHEMA
Page 106 and 107:
Figure A-2: Bar P-1-1/8 grate (UDFC
Page 108 and 109:
Figure A-4: 45º-tilt bar grate (UD
Page 110 and 111:
Figure A-6: Reticuline grate (UDFCD
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B.1 On-grade Test Results All three
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Test ID Number Configuration Longit
Page 117 and 118:
Test ID Number Configuration Table
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Table B-5: 4% and 1% on-grade test
Page 121 and 122:
Test ID Number Configuration Longit
Page 123 and 124:
APPENDIX C SUMP TEST DATA 105
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C.1 Sump Test Data All three inlets
Page 127 and 128:
APPENDIX D INLET CONSTRUCTION DRAWI
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D.1 Inlet Drawings (a) (b) Figure D
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(a) (b) (c) (d) Figure D-3: Type R
Page 133 and 134:
APPENDIX E DATA COLLECTION 115
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UDFCD Curb and Grate Study Data She
Page 137 and 138:
APPENDIX F ADDITIONAL PARAMETERS 11
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F.1 Additional Parameters Used in R
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Test ID Number depth (ft) Tw (ft) A
Page 143 and 144:
Page 145 and 146:
Table F-3: Additional parameters fo
Page 147 and 148:
Page 149 and 150:
APPENDIX G REGRESSION ANALYSIS STAT
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G.1 Statistical Qualities type: The
Page 153 and 154:
Plot of logE*pred. Legend: A = 1 ob
Page 155 and 156:
Plot of rstudent*pred. Legend: A =
Page 157 and 158:
The REG Procedure Model: MODEL1 Dep
Page 159 and 160:
Plot of logE*pred. Legend: A = 1 ob
Page 161 and 162:
APPENDIX H CALCULATED EFFICIENCY 14
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H.1 Efficiency Determined from Empi
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Test ID Number Table H-2: Type 16 c
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Table H-3: Type R curb inlet calcul
Page 169:
ELECTRONIC DATA SUPPLEMENT CONTENTS
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