2013-11-07_PERMIT FILE - M2013070

• Permit No: M2013070
• IBM Index Class Name: PERMIT FILE
• Doc Date: 11/7/2013
• Doc Name: New Application
• From: Liberty Mining, LLC
• To: DRMS
• Email Name: GRM
• Email Name: THM
• Media Type: D
• Archive: No

Liberty Mining, LLC
DRMS 110 -d Permit Application
October 2013
Table U(10 -1)
Peak Runoff Resulting from
100- Year /24 -Hour Rainfall Event
For Entrance Road
Basin No.
Basin Area,
Sq Ft
Length of Flow
Path, Feet
Average Surface
Slope of Basin,
Time of
Concentration; Min
100- Year /24 -Hour
Runoff Q, CFS
1
286,673
1600
14.84
18.9
5.2
2
502,310
1600
15.63
18.9
9.2
3
199,394
1450
12.93
1 18.1
3.7
4
75,639
900
17.50
15
1.5
5
95,244
825
18.10
14.6
2.0
6
29,206
275
18.16
9.8
0.7
7
10,736
300
20.83
9.8
0.3
8
41,415
475
18.42
12.6
0.9
9
68,863
400
20.63
11.4
1.6
10
156,592
600
15.63
13.3
3.3
11
69,474
350
25.00
10.0
1.6
12
17,034
275
18.18
9.8
0.4
13
30,526
320
11.72
11.8
0.7
The calculations for determining the culvert sizes to convey drainage water from the uphill side
of the roadway to the downhill side of the roadway were completed using the software package
Culvert Master. The Q's, i.e. required design flow rate to detemtine the carrying capacity of each
culvert, were taken from Table U(10 -1). Headwater depth was restricted to not more than the
depth or diameter of the culvert. Lengths for the culverts were determined from the topographic
data collected by SMA. Velocities of between 2.5 fps and 3.5 fps were targeted to be
maintained to ensure that the culvert would be self - cleaning. Presented below in Table U(10 -2)-
Culvert Requirements Resulting from 100 - year /24 -Hr Rainfall Event for Entrance Road, are the
culvert sizes required to convey water under the roadway at the locations identified on the
plans. The analytical parameters and the results of the calculations are presented in Table U
(10- 2)- Culvert Sizing from 100 - Year /24 -Hour Rainfall Event.
Table U(10 -2)
Culvert Requirements Resulting from
100- Year /24 -Hour° Rainfall Event
For Entrance Road
Culvert
No.
Basin #
Contributing
Flow y
Design
Q, cfs
Slope of
Culvert,%
Flow
Velocity,
s
Calculated
Culvert
Size, In
Recommended
Culvert Size, In
Recommended
Culvert
Capacity, cfs
1
3
3.70
2.86
3.52
15
15
5.51
2
5
2.00
2.86
4.50
12
15
2.27
3
6
0.70
2.20
1.79
12
15
2.27
4
8
0.90
2.20
2.29
12
15
2.27
5
11
1.60
0.83
3.72
12
15
2.31
6
12
0.4.0
0.80
1.02
12
15
2.30
Liberty Mining, LLC (Moab, Utah SMA Ref. 5621897 Page 62