PERMFILE136653

• Permit No: C1984067
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT 13 DRAINAGE AND SEDIMENT CONTROL PLAN
• Media Type: D
• Archive: No

• Coal Gulch Diversion Ditch No. 1
Uniform Slope Segments
Segment Top Bottom Elevation Slope 51ope
Number Elevation Elevation Difference Length Angle
(Map 12) (feet) (feet) (feet) (feet) (%)
1 7088 7070 18 894 2.0
2 7070 7066 4 25 16.0
3 7066 7050 16 475 3.4
4 7050 7036 14 400 3.5
Flow Conditions and Riprap Requirements*
Segment Flow Mean Top Design Median Riprap
Number Depth Velocity Width Depth Riprap Class
(feet) (ft/sec) (feet) (feet) (feet) (Table 2)
1 2.27 6.8 16.9 3.3 0.16 VL
2 1.3 14.4 12.8 3.0 1.7 VH
3 2.0 8.3 15.5 3.0 0.34 VL
4 2.0 8.4 15.4 3.0 0.35 VL
*Flow calculated based on 10 year, 24 hour design flow of 162 cfs using
Manning's equation with n = 0.04.
Median riprap size (d50) calculated based on Equation 5-4 in "Drainage
Criteria Manual", Denver Regional Council of Governments and Urban Drainage
and Flood Control District, Revised 1982.
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