Laserfiche WebLink
TABLE OF CONTEMS <br />• 2.4 STANDARD STEP WATER SURFACE PROFII.E ................................................ 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 Starttng Station ............................. 25 <br />2.4.2.3 Water Surface Elevation at Starting Station .................................... 25 <br />2.4.2.4 Start1 ~ Channel Station ................................................................ 25 <br />2.4.2.5 Station ........................................................................................... 25 <br />2.4.3 DESCRIP"ITON 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 Elevation ........................................................................ 26 <br />2.4.3.4 Depth of Flow ................................................................................. 26 <br />2.4.3.5 Other Computed Results of Standard Step Procedure ..................... 26 <br />2.4.3.6 Slope of the Energy Grade Line ....................................................... 26 <br />2.4.4 EXAMPLES OF STANDARD STEP PROCEDURE ..................................... 27 <br />2.4.4.1 Backwater Profile in a'IY-apezoidal Channel .................................... 27 <br />2.4.4.2 Backwater and Drawdown Protlle in a Trapezoidal Channel ............ 28 <br />2.4.4.3 Computing a Profile in a Circular Channel ..................................... 32 <br />CHAPTER 3 PIPE AND BOR CULVERT ANALY8I9 ................................................. SS <br />3.1 LQ9IITATIONS 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 Culvert Diameter .................................................................... 37 <br />3.2.2.2 Box Culvert Span (Width of Ope ............................................. 37 <br />3.2.2.3 Box Culvert Rise (Height of Ope .............................................. 37 <br />3.2.2.4 FHWA Chart Number and Scale Number ........................................ 37 <br />• 3. .2.6E trance Loss oetH ent ............................................................... 38 <br />3.2.2.7 Culvert Length ............................................................................... 39 <br />3.2.2.8 Culvert Slope ................................................................................. 39 <br />3.2.2.9 Flow Rates ..................................................................................... 39 <br />3.2.2.10 Tallwater Elevattons ..................................................................... 40 <br />3.2.3 RESULTS OF PERFORMANCE CURVE PROCEDURE .............................. 40 <br />3.2.3.1 Inlet Control Headwater ................................................................. 40 <br />3.2.3.2 Outlet Control Headwater ............................................................... 42 <br />3.2.3.3 Normal Depth of Flow In the Culvert ............................................... 43 <br />3.2.3.4 Critical Depth of Flow to the Culvert ............................................... 43 <br />3.2.3.5 Depth of Flow at Culvert Outlet ...................................................... 43 <br />3.2.3.6 Culvert Outlet Velodty ................................................................... 44 <br />3.2.4 EXAMPLES OF PERFORMANCE CURVE PROCEDURE ........................... 44 <br />3.2.4.1 Example of Pipe Culvert Analyses ................................................... 44 <br />3.2.4.2 Example of Pipe Culvert Performance Curve ................................... 45 <br />3.2.4.3 Example of Box Culvert AnalvsLS .................................................... 46 <br />3.2.4.4 Example of Box Culvert Performance Curve .................................... 47 <br />APPENDDI A ANNOTATED HIBLIOGRAPHY ......................................................... 48 <br />APPENDDL B TABLES .......................................................................................... Bl <br />MANNING'S ROUGHNESS COEFFICIENT ............................................................. 51 <br />ENTRANCE LOSS COEFFICIENT .......................................................................... 55 <br />FEDERAL ffiGHWAY ADMIl~TISTRATION CULVERT CHARTS ................................. 67 <br />CHART 1: Inlet Control -Concrete Plpe Culverts .................................................. 57 <br />CHART 2: Inlet Control -Corrugated Metal P1pe Culverts ...................................... 58 <br />CHART 3: Inlet Control -Pipe Culverts with Beveled Ring ...................................... 59 <br />CHART 4: Critical Depth -Circular Pipe ................................................................ 60 <br />CHART 5: Outlet Control -Concrete Plpe Culverts ................................................. 61 <br />CHART' 6: Outlet Control -Corrugated Metal Plpe Culverts ................................... 62 <br />• CHART 7: Outlet Control -Structural Plate Corrugated Metal Pepe Culverts .......... 63 <br /> <br />3.2.2.5 IIanning's Rou~hnes~ Coefficient ................................................... 38 <br />0 1989 Dodson & Associates. Inc., 5629 FM 1960 We57, Suite 314. Houston, Texm 77069, (713) 44x3787. All Rights Reserved ` ' <br />Y <br />