PERMFILE43021

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: DRAINAGE AND SEDIMENT CONTROL CALCULATIONS FOR HUBBARD CANYON VENTILATION FACILITIES
• Section_Exhibit Name: Exhibit 2.05-E3 SECTION 4
• Media Type: D
• Archive: No

Subj ect CULVERT ADEQUACY
Hubbard Canyon Ventilation Facilities
2- Somerset Coal Mine- Sheet
'-•al Gulch
6y 8AF
Ci~ecked
Acct
July 2 lq 81
Shee*_ No. 1 of 1 Sheets
Table 1, Area- Hcre ConvPrs] Ap and Weigh led curve Numbers Ah1C-II
Sq. In. Fraction Weighted Runoff
Area CN 1"=2000' Acres Total Acres CN Calculation Data

109E
51
2
28
209.4 i
0.296 i
15.1 CN=
I 59

Absarokee .
~ S=
P= 6.95
2. 7" (100-24)
IOIF 67 0.23 21.1 i 0.030 2.0 Q=
' (p00.25)2
Beenom P+ 0.85
R-1 70 2.93 269.1 0.380 j 26.6
Rock Outcrop I I i

58N-F
51
2.27
208.4
~ 0.294
t
i ~
~ j
15.0 i

i
Total _ _x_000 58.7 Q= 0.208 in.
~.ble 2. Weighted Runoff Quantity
~ AMC-I1
___ ____
Fraction _
Area CN Total Area S _ ~ ~_Weiyl~ted
109E .51 I 0.296 9.61 0.058 ~ 0.017
Absarokee
101E 67 0.030 4.92 0.444 i 0.013
Beenom
R-1 70 0.380 4.28 0.555 0.211
Rock Outcrop
X ~
58N-F 51 0.294 9.61 0.017
0.058
Fughes I_ i
- --~---..
- -
----T
Total 1.000 _ - ~ Q= 0.258. in.
Peak Flow = (0.258 in.)* (250 cf•/in.)** = 64.5 cfs
*Maximum runoff from either Table 1 or Table 2 (new 36" culvert at 9.33°0 65.6 cfs)
**Figure S-lA, " Peak Flows in Colorado"