Attachment A
HEC-HMS Screen Captures and Inputs
113-82323
HEC-HMS Basin Model Schematic (Mineable Scenario)
Subbasin
Area
(mi
2
)
Subbasin
Initial
Abstraction
(in)
Curve
Number
Impervious
(%)
Subbasin
Lag Time
(hr)
%Time
%Rainfall
BC-1
0.4958
BC-1
65
0
BC-1
0.336
0
0
Pt-S
0.0918
Pt-S
65
0
Pt-S
0.114
10
10
Pt NE
0.0686
Pt NE
65
0
Pt NE
0.128
20
23
Pt E
0.0498
Pt E
65
0
Pt E
0.152
30
34
BC-2
0.2315
BC-2
65
0
BC-2
0.248
40
45
Pit I
0.3547
Pit I
86
0
Pit I
0.100
50
56
Pt N
0.0345
Pt N
65
0
Pt N
0.097
60
67
Pd-N
0.2660
Pd-N
66
0
Pd-N
0.164
70
77
Pd-S
0.1310
Pd-S
65
0
Pd-S
0.137
80
86
WT 1
0.1232
WT 1
65
0
WT 1
0.113
90
94
HR 2
0.0835
HR 2
65
0
HR 2
0.130
100
100
HR 1
0.1388
HR 1
65
0
HR 1
0.225
WRF 1
0.1633
WRF 1
86
0
WRF 1
0.141
WRF 2
0.2246
WRF 2
86
0
WRF 2
0.134
PLNT
0.0705
PLNT
86
0
PLNT
0.100
WRF 3
0.3308
WRF 3
86
0
WRF 3
0.197
Reach
Length
(ft)
Slope
(ft/ft)
Manning's n subreaches Shape
Diameter
(ft)
Width
(ft)
Side Slope
(xH:1V)
R_Pt-E
1560
0.066
0.03
2
Trapezoid
10
12
R_BC-1
1310
0.01
0.03
2
Trapezoid
10
3
R_BC-2
555
0.054
0.03
2
Trapezoid
10
3
R_WT
480
0.03
0.03
2
Trapezoid
10
5
R_HR2
1785
0.08
0.03
2
Trapezoid
50
9
Sub Basin Area
Loss
SCS Curve Number
Transform
SCS Unit Hydrograph
Routing
Kinematic Wave Channel
Dimensionless S-Graph
J:\11JOBS\113-82323 Bear Lodge Mine\Surface Water\H&H calculations\Bear Lodge H&H v4.11Rev E.xlsm
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Golder Associates, Inc.
2/13/2014
