Table 4
Channel Hydraulic Calculations
J:\11JOBS\113-82323 Bear Lodge Mine\Surface Water\H&H calculations\Bear Lodge H&H v4.11Rev D v2.xlsm
Page 7 of 7
Golder Associates
1/14/2014
RARE ELEMENT RESOURCES
Date:
12/6/13
BEAR LODGE MINE PRE-FEASIBILITY STUDY
By:
AMS
PROJECT NO.:
113-82323
Chkd:
MBR
Apprvd:
RP
Reach Designation
Q100
from
HEC-HMS
(cfs)
HEC HMS
Element ID
for Q
Approximate
Channel
Length
(ft)
Bed
Slope
(ft/ft)
Left
Side
Slope
(H:1V)
Right
Side
Slope
(H:1V)
Bottom
Width
(ft)
Minimum
Channel
Depth
(ft)
Mannings 'n'
for Capacity
(Depth
Calculation)
Mannings 'n'
for Stability
(Velocity
Calculation)
Maximum
Velocity
(ft/sec)
Maximum
Normal Flow
Depth
(ft)
Froude
Number
Normal
Depth Shear
Stress
(lb/ft
2
)
Stream
Power
(W/m
2
)
Top Width of
Flow
(ft)
Top Width of
Channel
(ft)
WRF 1
299.8
WRF 1
4110
0.030
3.0
3.0
20
2.5
R Riprap
0.035
0.030
9.3
1.46
1.54
2.74
370.19
28.8
35.0
1.0
WRF 2a
417.1
WRF 2
2400
0.030
3.0
3.0
20
3.0
R Riprap
0.035
0.030
10.4
1.76
1.58
3.30
497.32
30.6
38.0
1.2
WRF 2b
417.1
WRF 2
3580
0.030
3.0
3.0
20
3.0
R Riprap
0.035
0.030
10.4
1.76
1.58
3.30
497.32
30.6
38.0
1.2
WRF 3
556.8
WRF 3
7400
0.030
3.0
3.0
20
3.5
R Riprap
0.035
0.030
11.4
2.07
1.61
3.88
641.14
32.4
41.0
1.4
WRF DIV W
36.6
Pt NE
2505
0.080
3.0
3.0
10
2.0
R Riprap
0.035
0.030
7.4
0.48
2.10
2.37
255.92
12.9
22.0
1.5
PIT DIV S
48.5
Pt-S
2745
0.091
3.0
20.0
0
2.0
R Riprap
0.035
0.030
7.7
0.78
2.23
4.46
497.35
18.0
46.0
1.2
PIT DIV N1
65.1
WT 1
3375
0.108
3.0
20.0
0
2.0
R Riprap
0.035
0.030
8.8
0.85
2.46
5.73
733.11
19.5
46.0
1.2
PIT DIV N2
101.2
R_HR2
1180
0.055
3.0
20.0
0
2.5
R Riprap
0.035
0.030
7.7
1.14
1.84
3.91
433.51
26.1
57.5
1.4
BC DIV U
280.7
J_BC-1
2025
0.010
3.0
3.0
15
3.5
R Riprap
0.035
0.030
6.6
2.20
0.93
1.37
131.15
28.2
36.0
1.3
BC DIV L
370.7
J_BC-2
1310
0.010
3.0
3.0
15
3.5
R Riprap
0.035
0.030
7.2
2.55
0.95
1.59
165.28
30.3
36.0
1.0
PD-N
157.5
PD-N
1660
0.030
3.0
3.0
10
2.5
R Riprap
0.035
0.030
8.6
1.43
1.50
2.68
335.0
18.6
25.0
1.1
PD-S
70.4
PD-S
410
0.073
3.0
3.0
10
2.0
R Riprap
0.035
0.030
9.0
0.71
2.13
3.25
426.0
14.3
22.0
1.3
< 1/2 Vel. Head
indicates that the remaining freeboard is less than 1/2 the velocity head (V
2
/2g)
suggesting water may splash out.
Warning: VxD>9
indicates that the velocity times the depth is greater than 9 ft
2
/sec, which is undesirable and may be un
Unstable V
indicates that calculated velocity exceeds the recommended maximum for the lining material.
Unstable T
indicates that calculated shear stress exceeds the recommended maximum for the lining material.
Design Channel
Lining
Channel Roughness Parameters
Available Freeboard
(ft)
Hydraulic Calculations
Channel Design Geometry
Channel Evaluations
