2010-05-07_REVISION - M1977493 ‎(10)‎

• Permit No: M1977493
• IBM Index Class Name: REVISION
• Doc Date: 5/7/2010
• Doc Name: Amendment Application- Part 2
• From: Climax Molyb
• To: DRMS
• Type & Sequence: AM6
• Email Name: ACS
• Media Type: D
• Archive: No

• Table K-7
Climax Weather Station - Log Pearson III Design Rainfall
Job No.: 1051.27.01
Project: Climax Mine
Client: Climax Molybdenum Company
Subject: Log Pearson III Rainfall from Climax Weather Station
Distributed Per NOAA Atlas II Rainfall Depth-Duration
Calcs by:
Return Period
Duration min 2 5 10 25 50 100 200 500 1000
5-min 5 0.13 0.18 0.21 0.25 0.29 0.33 0.36 0.41 0.45
10-min 10 0.20 0.28 0.33 0.39 0.45 0.52 0.57 0.64 0.69
15-min 15 0.25 0.35 0.41 0.50 0.57 0.66 0.72 0.81 0.88
30-min 30 0.35 0.49 0.57 0.69 0.79 0.91 0.99 1.12
1-hr 60 0.45 0.62 0.73 0.87 1.00 1.15 1.26 1.42
2-hr 120 0.53 0.70 0.82 0.98 1.10 1.21 1.34 1.50
3-hr 180 0.58 0.76 0.87 1.04 1.16 1.24 1.39 1.55 a
6-hr 360 0.68 0.87 0.99 1.17 1.28 1.32 1.50 1.66
12-hr 720 0.79 1.03 1.17 1.38 1.52 1.62 1.80 1.99 2.1
24-hr 1440 0.94 1.22 1.40 1.6
4
1.81
1.99
2.16
2.40
Notes: Latitude: 39.3667 Longitude: 106.1833 Elevation: 11,294 ft
24-hr rainfall depths from Log Pearson analysis of Climax Weather Station
6-hr rainfall depths calculated as ration of 24-hr based on NOAA Atlas 2 values
Equations apply to NOAA Atlas 2 (Colorado) Region 2, which includes: Upper Colorado River Basin
• Equations for 5-min. 10-min, 15-min. 30-min, 2-hr. 3-hr, and 12-hr precip depths for all return periods
{5-min] = 0.29 * {1-hr) (NOAA)
(10-min) = 0.45 * {1-hr) (NOAA)
(15-min) = 0.57 * {1-hr) (NOAA)
{30-min] = 0.79 * (1-hr) (NOAA)
{2-hr) = 0.341 * {6-hr) + 0.659 * (1-hr) (NOAA, region 2)
(3-hr) = 0.569 * {6-hr) + 0.431 * (1-hr) (NOAA, region 2)
{12-hr) = 0.55 * (6-hr) + 0.45 * {24-hr) (Wheeler)
Equations for 1-hr precip depths for 2-vr, 5-vr, 10-vr, 25-vr. 50-vr, and 100-vr return periods
{2-yr,1-hr) _ -0.011 + 0.942 * {6-hr)2 / {24-hr) (NOAA, region 2)
(5-yr,1-hr) = 0.241 * {100-yr,1-hr) + 0.759 * {2-yr,i-hr) (Wheeler)
(10-yr,l-hr) = 0.399 * {100-yr,l-hr) + 0.601 * {2-yr,l-hr) (Wheeler)
{25-yr,1-hr) = 0.607 * (100-yr,1-hr) + 0.392 * (2-yr,1-hr) (Wheeler)
{50-yr,1-hr) = 0.791 * (100-yr,i-hr) + 0.209 * (2-yr,1-hr) (Wheeler)
(100-yr,1-hr) = 0.494 + 0.755 * (6-hr)2 / {24-hr) - 0.008 (NOAA, region 2)
Equations to extrapolate 1-hr, and 6-hr precip depths for 200-yr. 500-vr, and 1000-yr return periods
(1-hr) = LOG„ [ (x-yr) / b ] (Wheeler)
{6-hr) = LOG,, [ {x-yr) / b ] (Wheeler)
y = b* MAX
1-hr
6-hr
•
M
291.58 0.16
316.81 0.04
Exhibit K Table K-7 May 2010