PERMFILE66000

• Permit No: C1980005
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: WADGE SCRAPER NORTH PIT DITCH
• Section_Exhibit Name: TAB 07 APPENDIX 7-6a-A
• Media Type: D
• Archive: No

Culvert No. 49b is sized based on the discharge from the ditch or 26.7
• cfs (see Table 12-3a, "Culvert Specifications"). The HW/D is
approximately 0.9. The culvert pipe w.as sized using Dodson and
Associates, Inc.`s "Pipe Lulvert Analysis Program" based on Federal
Highway Administration methods. Following is the performance curve
computation results for Culvert No. 49b.
Pipe Culvert Analysis
Computation of Culvert Performance Curve
n
U
C1
J
Culvert Diameter (feet)
FHWA Chart Number (1,2, or 3)
Scale Number on Chart (Type of Culvert Entrance)
Manning's Roughness Coefficient (n- value)
Entrance loss Coefficient of Culvert Opening
Culvert Length (feet)
Culvert Slope (feet per foot)
Results
3
2
3
O.CC4
0.5
80
0.01
Normal Critical Depth at Outlet
Flow Rate Tailwater Headwater (ft) Depth Depth Outlet Vel.
(cfs) Depth (ft) In.Ctrl. Out.Ctrl. (f t) (ft) (ft) (fps)
3.20 0.75 0.76 0.99 0.60 0.56 0.75 2.32
1.00 1.00 1.17 1.11 0.90 0.83 0.90 3.95
12.60 1.25 1.65 1.43 .1.22 1.13 1.22 4.66
20.50 1.50 2.24 1.88 1.63 1.45 1.63 5.23
26.90 1.66 2.69 2.32 1.93 1.G8 1.93 5.59
30.90 1.75 2.96 2.63 2.13 1.50 2.13 5.74
44.10 2.00 3.93 3.81 3.00 2.16 3.00 6.24
60.40 2.25 5.6G 5.88 3.00 2.51 2.51 9.57
80.00 2.50 8.10 8.97 3.00 2.77 2.77 11.73
103.20 2.75 13.41 13.61 3.00 2.91 2.91 14.73
130.20 3.00 20.38 20.43 3.00 2.96 3.00 18.42
A_4 02/13/87