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TABLE OF CONTEMS <br />I <br />2.4 STANDARD STEP WATER SURFACE PROFILE ................................................ 24 • <br />2.4.1 LIMITATIONS OF STANDARD STEP PROCEDURE .................................. 24 <br />2.4.2 REQUIRED INPUT DATA FOR STANDARD STEP PROCEDURE ............... 25 ~ <br />2.4.2.1 Flow Rate and Description of Channel ............................................ 25 <br />2.4.2.2 Channel Flow-Line Elevation at Starting Station ............................. 25 I <br />2.4.2.3 Water Surface Elevation at Starting Station .................................... 25 <br />2.4.2.4 Starting Channel Statlon ................................................................ 25 <br />2.4.2.5 Station ......................................................... ............................ 25 <br />2.4.3 DESCRIPI'lON OF RESULTS OF STANDARD STEP PROCEDURE ............ 26 <br />2.4.3.1 Normal Depth and Critical Depth ................................................... 26 <br />2.4.3.2 Computed Water Surface Elevation ................................................ 26 <br />2.4.3.3 Flow-Line Elevatlon ........................................................................ 26 <br />2.4.3.4 Depth of Flow ................................................................................. 26 <br />2.4.3.5 Other Computed Results oC Standard Step Procedure ..................... 26 <br />2.4.3.6 Slope of the Energy Grade Llne ....................................................... 26 <br />2.4.4 EXAMPLES OF STANDARD STEP PROCEDURE ..................................... 27 <br />2.4.4.1 Backwater Proflle in a Trapewidal Channel .................................... 27 <br />2.4.4.2 Backwater and Drawdown Profile in a Trapewidal Channel ............ 28 <br />2.4.4.3 Computing a Proflle in a Circular Channel ..................................... 32 , <br />CHAPTER 3 PIPE AND HOX CULVERT ANALY973 ................................................. 38 ~ <br />3.1 LIMITATIONS OF THE CULVERT ANALYSIS PROGRAMS ................................ 35 <br />3.2 PERFORMANCE CURVE PROCEDURE ............................................................ 35 <br />3.2.1 HOW THE PERFORMANCE CURVE PROCEDURE WORKS ..................... 36 <br />3.2.2 REQUIRED INPUT DATA FOR PERFORMANCE CURVE PROCEDURE .... 36 <br />3.2.2.1 Pipe Cuivert Dlameter .................................................................... 37 <br />3.2.2.2 Box Culvert Span (Width of Ope~ ............................................. 37 <br />3.2.2.3 Box Culvert R1se (Height of Ope .............................................. 37 <br />3.2.2.4 FHWA Chart Number and Scale Number ........................................ 37 <br />3.2.2.5 Mann[ng's Roughness CoeffiGent ................................................... 38 <br />3.2.2.6 Entrance Loss oefflcient ............................................................... 38 <br />3.2.2.7 Culvert Length ............................................................................... 39 <br />3.2.2.8 Culvert Slope ................................................................................. 39 I <br />3.2.2.9 Flow Rates ..................................................................................... 39 <br />3.2.2.10 Tailwater Elevations ..................................................................... 40 <br />3.2.3 RESULTS OF PERFORMANCE CURVE PROCEDURE .............................. 40 <br />3.2.3.1 het Control Headwater ................................................................. 40 <br />3.2.3.2 Outlet Control Headwater ............................................................... 42 <br />3.2.3.3 Normal Depth of Flow to the Culvert ............................................... 43 <br />3.2.3.4 Critical Depth of Flow 1n the Culvert ............................................... 43 ~ <br />3.2.3.5 Dep[h of Flow at Culvert Outlet ...................................................... 43 `.. <br />3.2.3.6 Culvert Outlet Velocity ................................................................... 44 <br />3.2,4 EXAMPLES OF PERFORMANCE CURVE PROCEDURE ........................... 44 <br />3.2.4.1 Example of Ptpe Culvert Analysts ................................................... 44 <br />3.2.4.2 Example of Pipe Cuh+ert Performance Curve ................................... 45 <br />3.2.4.3 Exam le of Box Culvert ....................................... 46 <br />P Analysts ............. <br />3.2.4.4 Example of Box Culvert Performance Curve .................................... 47 <br />APPENDIX A ANNOTATED BD3LIOGRAPHY ......................................................... 49 ;.: <br />APPENDIX H TAHLE9 .......................................................................................... Bl <br />MANNING'S ROUGHNESS COEFFICIENT ............................................................. 51 <br />ENTRANCE LOSS COEFFICIENT .......................................................................... 55 <br />FEDERAL ffiGHWAY ADMIIHI8TRATION CSILVERT CHART9 ................................. 87 <br />CHART 1: Inlet Control -Concrete Pipe Culverts .................................................. 57 <br />CHART 2: Inlet Control -Corrugated Metal Pipe Culverts ...................................... 58 <br />CHART 3: Inlet Control -Pipe Culverts with Reveled Rtng ...................................... 59 <br />CHART 4: Critical Depth -Circular Pipe ................................................................ 60 <br />CHART 5: Outlet Control -Concrete Ptpe Culverts ................................................. 61 <br />CHART 6: Outlet Control -Corrugated Metal Plpe Culverts ................................... 62 <br />CHART 7: Outlet Control -Structural Plate Corrugated Metal Plpe Culverts .......... 63 <br /> <br />0 1989 DOdsOn & Associates. 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