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

ACT
•
Protection of the Hydrologic
System Somerset Coal lvtine
Elk Creek Mine Yard -East
Storage Yard -Prelimiciary Only
L H i.., ~. ~ ._.. - - - ------------------
By M. O. A
Date .Tuly 14, 1950
Sheet No. 1 of 2 Sheets
Scale Ma ^" x 5. 7392102 = Acres ? 50 Scale Ma Q" x 0.0573921 =Acres ~
I % Total Wtd, ~~ %, Total r Wtd.
Area Acres Acres (N }~ CN Arr.a Acre:: ~ Acres C[Q
,8 ; 0. 040 .230 .04387 2. Sts ~8 3. 45 .198' .03776 2.19
)0 ~ 0. 0 35 .201 .03834 3. 45 61 3. 88 . 223j .04253 I 2. 59
100 Scale h1a ^" x 0. "LZy5684 = Acres E 68 2, 03 .1171 .02232 ' 1.52
58:2 O50 ..471 , 08983 I 5.21 ~ 70 3. 5L .2021 03853 .~ 2. 70
6
b
i
6
'
.2 Z
O
1
,
- 519, . 09899 , 04
~ ~~ 82 0. 32 . 018 .00343 ~ 0. 28
~
b8 }0.625 L43 -02717 1.85 85 0. 50 .0291 .00553
0.47
70 ' 3. 000 .689 .13141 9, 20 87 5. 30 ~
.304 .05798 5, 04 i
87 ? 7 (•.30

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OL'F CALCiJLATION DATA AND F'i)1t1V1~"iLAS;
AMC - II
CN = 75
S = 3.33

AMC - 1
CN = 57
5 = 7. 54
R = (~~2 =Inches of run off
P+. S
V = Acres X Q" 12 =Acre feet
V =Acre - feet X 43560 =Cubic feet
10 Y r. 24 Hr.
P = 1. 90" (10 yr. 24 hr. )
Acres = 5. 243
25 Yr. 24 Hr.
Run Off Com utations AMC-II AMC-I AMC-II AMC-I
Acres 5.243 5.243 5.243 5.243
Storn•i Potential 24 hr. "P" 1.90 1.90 2. 30 2. 30 )
S Valve CN 75 & CN 57 3. 33 7.54 3. 33 7.54
Quanti -inches run off 0. 334 0. 019 0. 538 0. 075
Volume R.O. Acre-feet 0. 146 0.008 0.235 0.033
Volume R. O. Cubic-feet 6, 349. 96 368. 70 10, 236. ti7 1, 432, 87
SoLl Loss Volume -from 2 I ~ rr~'i. __ ~lrr,, •. ;
Required Pond Volume _,~-(~. ':; ~ ~' , •i'' ~ -
B-..><
El. .. I : ~~-::-'! I