PERMFILE57171

• Permit No: C1981014
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: pages 93R to 155L
• Section_Exhibit Name: EXHIBIT 19 MINE AREA DIVERSIONS AND DITCHES
• Media Type: D
• Archive: No

• Curve Number (CN):
Vegetation Type: ponderosa
woodland, grassland
Cover Density: 60$
Soils:
Hydrologic Soil
Soil Tvoe Groua
126 C
56 C
122 B
64 D
121 B
112 B
pine-pinyon-juniper
Area (acres) CN*
209.9 69.5
213.2 69.5
95.5 52.8
123.3 76.5
141.7 52.8
101.6 52.8
*(Ref: SCS, Figure S-3, using Juniper-Grass
vegetation with 60$ cover.)
Weighted Average CN = 64
Precipitation:
• (from Procedures for Determining Peak Flows in
Colorado, SCS, 1980)
10-year, 24-hour event: 2.80 inches
100-year, 24-hour event: 4.40 inches
Hvdrolocrv Results
(Using SEDCAD+ computer model: Refer to Table 18, Magpie
Creek Diversion - 10-Year, 24-Hour Hydrograph Analysis,
and Table 19, Magpie Creek Diversion - 100-Year, 24-Hour
Hydrograph Analysis, at the end of this section, for
computer printouts.)
Peak Discharge
10-year, 24-hour event: 142.61 cfs
100-year, 24-hour event: 390.5 cfs

TR-32 142 Revised 8/01