2001-12-11_PERMIT FILE - C1981019

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: Exhibit 07 Item 03 Design of Surface Runoff Control Stuctures
• Media Type: D
• Archive: No

Table 1
Mining Area Ditches
Item Ditches
(1) (2) (3) (4) (5) (b) (7)

Ditch No. 1 2 3 4 5 6
Designation Diversion No. Diversion Na. Streeter Gulch A Gulch A East Side
1 to Prospect 2 to Prospect Gulch N . Ditch S. Ditch Collection
Gulch Gulch Ditch
Maximum Drainage Area (acres) 517 322 1424 30 638 100
Design Category Temporary Permanent Permanent Permanent Permanent Temporary
Design Precipitation Frequency (years) 10 10 100 10 10 10
Runoff Coefficient CN67 CN67 CN67 CN67 CN67 CN67
Rainfall Intensity (in/hr) 1.8 1.8 2.8 1.8 1.8 1.8
Design Flow (cfs) 5.3 4.0 22.0 0.4 7.4 1.0
Average Slope (%) 1.0 5.1 7.3 24 11.6 1.0
Roughness Factor, Manning's n 0.03 0.03 0.04 0.04 0.04 0.03
Design Depth (feet) 0.5 0.2 0.5 0.1 0.4 0.2
Design Width (feet) 3.0 5.0 6.0 2.0 3.0 5.0
Velocity (ft/sec) 2.5 3.7 6.0 2.8 5.7 1.3
Rock Protection Required No No Yes Yes Yes No
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