TABLE 1
SUBBASIN SUMMARY TABLE
Date:
2/13/14
Project Number:
By:
MBR
Chkd:
SR
Design Storm
100 -Year Reccurence Interval
Apprvd:
REK
2-Year, 24-Hour
Depth
(inches)
100-Year , 24-Hour
Depth
(inches)
Storm
Distribution
1.4
3.2
II
CN = 65
CN = 86
Subbasin ID
Subbasin Area
(ft
2
)
Subbasin
Area
(acres)
Subbasin
Area
(sq mile)
Woods-Grass
Combo HSG B
Fair Cover
(acres)
Newly Graded
Areas HSG B
(acres)
Composite
SCS Curve
No.
S = 1000 -
10
CN
Unit Runoff
Q
(in)
Runoff
Volume
(ac-ft)
Runoff
Volume
(ft
3
)
Pt S
2,560,076 58.77
0.0918
58.77
CN = 65
5.38
0.62
3.04
132,252
Pt E
1,388,135 31.87
0.0498
31.87
CN = 65
5.38
0.62
1.65
71,710
Pt NE
1,911,922 43.89
0.0686
43.89
CN = 65
5.38
0.62
2.27
98,769
Pt N
961,099 22.06
0.0345
22.06
CN = 65
5.38
0.62
1.14
49,650
WRF 1
4,551,559 104.49
0.1633
104.49
CN = 86
1.63
1.87
16.28
709,258
WRF 2
6,262,079 143.76
0.2246
143.76
CN = 86
1.63
1.87
22.40
975,805
WRF 3
9,221,573 211.70
0.3308
211.70
CN = 86
1.63
1.87
32.99 1,436,976
BC 1
13,822,026 317.31
0.4958
317.31
CN = 65
5.38
0.62
16.39
714,036
BC 2
6,455,220 148.19
0.2315
148.19
CN = 65
5.38
0.62
7.66
333,472
Pd N
7,416,545 170.26
0.2660
165.86
4.40
CN = 66
5.15
0.66
9.41
409,955
Pd S
3,653,339 83.87
0.1310
83.87
CN = 65
5.38
0.62
4.33
188,729
HR 1
3,870,628 88.86
0.1388
88.86
CN = 65
5.38
0.62
4.59
199,954
HR 2
2,328,253 53.45
0.0835
53.45
CN = 65
5.38
0.62
2.76
120,276
WT 1
3,434,479 78.84
0.1232
78.84
CN = 65
5.38
0.62
4.07
177,423
PLNT
1,964,918 45.11
0.0705
45.11
CN = 86
1.63
1.87
7.03
306,188
Pit I
9,889,183 227.02
0.3547
227.02
CN = 86
1.63
1.87
35.38 1,541,008
113-82323
RARE ELEMENT RESOURCES
BEAR LODGE MINE PRE-FEASIBILITY STUDY
J:\11JOBS\113-82323 Bear Lodge Mine\Surface Water\H&H calculations\Bear Lodge H&H v4.11Rev E.xlsm
Page 1 of 1
Golder Associates
2/13/2014
