1986-10-07_PERMIT FILE - C1981008A

• Permit No: C1981008A
• IBM Index Class Name: PERMIT FILE
• Doc Date: 10/7/1986
• Doc Name: Dodson & Associates Hydraulic Programs TRAP PIPE
• Section_Exhibit Name: Tab 13 Attachment J
• Media Type: D
• Archive: Yes

TABLE OF CONTENTS
2.7.3.1 Flow Rate and Description of Channel 30
2.7.3.2 Channel Flow-Line Elevation at Starting Station . . . . 30
2.7.3.3 Water Surface Elevation at Starting Station . . . . . . 30
2.7.3.4 Starting Channel Station . . . . . . . . . . . . . . . 31
2.7.3.5 Station 31
2.7.4 Description of Results of Standard Step Procedure . . . . . 31
2.7.4.1 Normal Depth and Critical Depth . . . . . . . . . . . . 31
2.7.4.2 Computed Water Surface Elevation . . . . . . . . . . . 31
2.7.4.3 Flow-Line Elevation . . . . . . . . . . . . . . . . . . 32
2.7.4.4 Depth of Flow . . . . . . . . . . . . . . . . . . . . . 32
2.7.4.5 Other Computed Results of the Standard Step Procedure . 32
2.7.4.6 Slope of the Energy Grade Line . . . . . . . . . . . . 32
2.7.4.7 Printing Reports and Graphs . . . . . . . . . . . . . . 33
2.7.5 Examples of Standard Step Procedure . . . . . . . . . . . . 33
2.7.5.1 Backwater Profile in a Trapezoidal Channel . . . . . . 33
2.7.5.1.1 Description of Example . . . . . . . . . . . . . . 33
2.7.5.1.2 Solution to Example . . . . . . . . . . . . . . . 33
2.7.5.1.3 Example Screen Display . . . . . . . . . . . . . . 34
2.7.5.1.4 Example Graph . . . . . . 35
2.7.5.2 Backwater and Drawdown Profile in a Trapezoidal Channel 35
2.7.5.2.1 Example Description . . . . . . . . . . . . . . . 35
2.7.5.2.2 Solution to Example . . . . . . . . . . . . . . . 36
2.7.5.2.3 Example Screen Display - Backwater Curve . . . . 37
2.7.5.2.4 Example Screen Display - Drawdown Curve . . . . . 38
2.7.5.3 Computing a Profile in a Circular Channel . . . . . . . 38
2.7.5.3.1 Description of Example . . . . . . . . . . . . . . 38
2.7.5.3.2 Solution to Example . . . . . . . . . . . . . . . 39
2.7.5.3.3 Example Screen Disvlav . . . . . . . . . . . . . . 39
3 PIPE AND BOX CULVERT ANALYSIS . . . . . . . . . . . . . . . . . . . . 41
3.1 DESCRIPTION OF PIPE AND BOX CULVERTS . . . . . . . . . . . . . . 41
3.2 PURPOSE OF THE CULVERT ANALYSIS PROGRAMS . . . . . . . . . . . . 42
3.3 LIMITATIONS OF THE CULVERT ANALYSIS PROGRAMS . . . . . . . . . . 42
3.4 PERFORMANCE CURVE PROCEDURE . . . . . . . . . . . . . . . . . . . 42
3.4.1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . 42
3.4.2 Flow Chart for Performance Curve Procedure . . . . . . . . . 43
3.4.3 How the Performance Curve Procedure Works 44
3.4.4 Required Input Data for Performance Curve Procedure . . . . 44
3.4.4.1 Pipe Culvert Diameter . . . . . . . . . . . . . . . . 44
3.4.4.2 Box Culvert Span (Width of Opening) . . . . . . . . . 44
3.4.4.3 Box Culvert Rise (Height of Opening) . . . . . . . . . 44
3.4.4.4 FHWA Chart Number and Scale Number . . . . . . . . . . 45
3.4.4.5 Manning's Roughness Coefficient . . . . . . . . . . . 46
3.4.4.6 Entrance Loss Coefficient . . . . . . . . . . . . . . 46
3.4.4.7 Culvert Length . . . . . . . . . . . . . . . . . . . . 47
3.4.4.8 Culvert Slope . . . . . . . . . . . . . . . . . . . . 47
3.4.4.9 Flow Rates . . . . . . . . . . . . . . . . . . . . . . 47
3.4.4.10 Tailwater Elevations . . . . . . . . . . . . . . . . . 48
3.4.5 Description of Results of Performance Curve Procedure . . . 48
3.4.5.1 Inlet Control Headwater . . . . . . . . . . . . . . . . 48
3.4.5.1.1 Method of Computing Inlet Control Headwater . . . 48
3.4.5.1.2 Constants for Inlet Control Eauations . . . . . . 50
3.4.5.1.3 Accuracy of Inlet Control Headwater Computations . 50
3.4.5.1.4 Average h Maximum Error of Inlet Control Eauations 51
DODSON & ASSOCIATES, INC. THE DODSON HYDRAULICS LIBRARY