PERMFILE54019

• Permit No: C1981022
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: EAST YARD POND DESIGN CALCULATIONS
• Section_Exhibit Name: Exhibit 2.05-E3 SECTION 1
• Media Type: D
• Archive: No

•
Subject Protection of the
Hvdrologic Svstem
Somerset Coal Mine -Elk Creelc Area
October 17 1979
Drainace Arca about East Storaec Yard Sh t N
General Data
ee o
Rainfall: 10 year 24-hour storm = 1.90"
1 of 5 Sheets
Hydrologic Soil = B, Hydrologic Soil Map with CN = 3 Maps, by U.S.S.
Table ES-2 Table of Acres by Gurve Number - 3 MdDS
.~•

Maps:
50 Scale
Topography 1" = 100'
Elk Creel< _'a1~d - E. Est.
500
Scale Topography
Constants: Acres per sq. in.
50 x 50 + 43560 = .0573921
100 x 100 t 43560 = 0. 2295684
500 x
500 + 43560
= S. 739210:

CN ammeter
Arca S .In.
Acres
CN animcte r
Area Sq. In
Acres
CN antmeter
Area Sq. In.
Acres
42 26.395 1.515 47 13.985 3. 211 40 2.370 13. 601
48 110. 065 6. 317 58 2. 050 0. 471 43 1.680 9. G42
51 87.375 5.015 61 2.260 0. 519 45 0.070 0. 402
53 38.200 2.192 68 0.625 0. 143 47 2.290 13. 143
58 30.340 1.741 70 3.000 0. 689 48 0. 360 2. 066
61 5.505 0.316 51 2.380 13. 659
68 2.930 0.168 53 0.015 0. 086
70 8.815 0.506 68 0.040 0. 229
82 10.315 0.592 90 0.405 2. 324
85 1.400 0.080
90 17.685 1.015

339.025 19.457 21.920 5. 033 9.610 55. 152
Table ES-3 1'Veighted Curve Number By Acres

GN
Acres -ia r 100
TotalAcres Weighted
CN
GN
Acres % _ 100
To a Weighted
40 13 .601 .17077 6.83 58 2. 212 .02777 1. 61
42 1. Si5 .01902 0.80 61 0. 835 .01048 0. 64
43 9 .642 .12106 5.21 68 0. 640 .00804 0. 55
45 0. 402 .00504 0.23 70 1. 195 .01500 1. 05
47 16. 354 .20534 9.65 82 0. 592 .00743 0. 61
48 8. 383 10525 5. OS 85 0. 080 .00100 0. 09
51 18. 674 .23447 11.96 90 3. 339 .04192 3. 77
53 2. 278 .02860 1.52

Continued
next colum _
Totals _
79. _
642 _
.99999
49.
57
CALCULATION NOTES
ey M. O. Anderson
Checked
ACC~L
B-35