TABLE 2
BASIN TIME OF CONCENTRATION CALCULATIONS
Date:
2/13/14
By:
MBR
Project Number:
Chkd:
SR
Apprvd:
REK
Subbasin ID
Subbasin
Area
(sq mile)
Composite
Curve Number
Total
Lag
(0.6*Tc)
(min)
Total
Travel
Time
(min)
Type of
Flow
Length
(ft)
Slope
(ft/ft)
Typical Hydraulic
Radius
(Channel Only)
(ft)
Travel
Time
(min)
Type of
Flow
Length
(ft)
Slope
(ft/ft)
Typical Hydraulic
Radius
(Channel Only)
(ft)
Travel
Time
(min)
Pt S
0.0918
65
6.9
11.4 Sheet
80 0.188 H Range
4.4 Shallow 300 0.220 U Unpaved
0.7
Pt E
0.0498
65
9.1
15.2 Sheet
100 0.240 H Range
4.8 Shallow 1150 0.184 U Unpaved
2.8
Pt NE
0.0686
65
7.7
12.8 Sheet
100 0.200 H Range
5.2 Shallow 825 0.148 U Unpaved
2.2
Pt N
0.0345
65
5.8
9.7 Sheet
100 0.170 H Range
5.5 Shallow 265 0.238 U Unpaved
0.6
WRF 1
0.1633
86
8.5
14.1 Sheet
100 0.010 A Smooth
2.4 Shallow 610 0.010 U Unpaved
6.3
WRF 2
0.2246
86
8.0
13.4 Sheet
100 0.010 A Smooth
2.4 Shallow 400 0.010 U Unpaved
4.1
WRF 3
0.3308
86
11.8
19.7 Sheet
100 0.010 A Smooth
2.4 Shallow 610 0.010 U Unpaved
6.3
BC 1
0.4958
65
20.1
33.6 Sheet
100 0.130 H Range
6.2 Shallow 1095 0.238 U Unpaved
2.3
BC 2
0.2315
65
14.9
24.8 Sheet
100 0.180 H Range
5.4 Shallow 1145 0.195 U Unpaved
2.7
Pd N
0.2660
66
9.8
16.4 Sheet
100 0.097 H Range
6.9 Shallow 1270.0 0.122 U Unpaved
3.8
Pd S
0.1310
65
8.2
13.7 Sheet
100 0.137 H Range
6.0 Shallow 1805.0 0.137 U Unpaved
5.0
HR 1
0.1388
65
13.5
22.5 Sheet
100 0.160 H Range
5.7 Shallow 680.0 0.262 U Unpaved
1.4
HR 2
0.0835
65
7.8
13.0 Sheet
100 0.160 H Range
5.7 Shallow 670.0 0.221 U Unpaved
1.5
WT 1
0.1232
65
6.8
11.3 Sheet
100 0.150 H Range
5.8 Shallow 425.0 0.278 U Unpaved
0.8
Notes:
(1) Refer to Attachment A for Roughness Condition descriptions and Tc Coeffiecients.
(2) PLNT and Pit I Subbasins times of concentration assumed to be 10 min
113-82323
RARE ELEMENT RESOURCES
BEAR LODGE MINE PRE-FEASIBILITY STUDY
Roughness Condition
(1)
Flow Segment 1
Flow Segment 2
Roughness Condition
(1)
J:\11JOBS\113-82323 Bear Lodge Mine\Surface Water\H&H calculations\Bear Lodge H&H v4.11Rev E.xlsm
Page 1 of 2
Golder Associates
2/13/2014
