2012-01-06_PERMIT FILE - C1982057 ‎(30)‎

• Permit No: C1982057
• IBM Index Class Name: Permit File
• Doc Date: 1/6/2012
• Section_Exhibit Name: Tab 13 Attachment 13-10 Part 1
• Media Type: D
• Archive: No

TABLE 2
Summary of Wate rshed Parameters and Design Statistics for Mine Entran ce Haul Road D itches
Within the Permit Area Including Mine Entrance Road, Seneca II-W Mine, Ro utt County, Colorado
Watershed Parameters Hydraulic Design Parameters

Elevation Peak Discharge Average Flow
Drainage Area Length Difference 10-Yr., 24-Hr, Slope Depth Velocity
Ditch No, (Ac) (Mi) (Ft) CN Storm (CFS) (Ft/Ft) (Ft) (FPS)

MERD-ME1 1.0 0.09 10 89 0.7 0.01 0.42 1,44
MERD-ME2 113.8 1.11 620 70 3.56 0.034 0,23 2.75
MERD-ME3 1.5 0.19 50 89 1,1 0.05 0,36 2.92
MERD-ME4 412.7 1.25 835 70 32.0 0.06 0,28 4,25
MERD-MES 3.0 0.62 180 89 1.97 0.06 0,43 3.59
Note: All ditches designed with SEDCAD and Mannings n = 0.03 except riprapped
(1) Road safety berm ditch.
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Type
V
Trapezoid
V
Trapezoid
V
Bottom
Width
(Ft)
(1)
5
(1)
10