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Moss - 2010

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Moss Effects on River Stage
(2010)
Gage Height Shift (feet)
9/30/2009
9/16/2009
9/2/2009
8/19/2009
8/5/2009
7/22/2009
7/8/2009
6/24/2009
6/10/2009
5/27/2009
5/13/2009
4/29/2009
4/15/2009
4/1/2009
3/18/2009
3/4/2009
2/18/2009
2/4/2009
1/21/2009
1/7/2009
12/24/2008
12/10/2008
11/26/2008
11/12/2008
10/29/2008
10/15/2008
10/1/2008
Date
Bighorn River near St. Xavier MT
Bighorn Riv e r Ne ar St Xav ie r
0
Gage Height Shift (Feet) Oct. 08-Sept. 09
-0.2
-0.4
-0.6
-0.8
-1
-1.2
-1.4
-1.6
-1.8
-2
Bighorn River near St. Xavier MT
Gage Height Shift (Feet) Oct. 09-May 10
Bighorn River near St. Xavier MT
Gage Height Shift (Feet) Oct. 08-Sept. 09
Bighorn River System near St. Xavier MT
Gage Height Shift 1999 to 2010 (in feet)
Shift
Shift
Shift
Riv. Drop
Riv. Drop
Nov. Flow
Oct/Nov
Jan/Feb
Mar/Apr
(Oct/Nov)
(Oct/Nov)
(CFS)
Max
Min
Min
to (Jan/Feb)
to (Mar/Apr)
2010
2500
183
-0.05
.13
2009
2500
1.55
0.05
0.05
1.5
1.5
2008
1,900
1.06
0.14
0.05
0.92
1.01
2007
1,500
1.2
0.15
0.08
1.05
1.12
2006
2,500
1.46
0.12
0.12
1.34
1.34
2005
1,500
1.15
0.2
0.11
0.95
1.04
2004
1,500
1.08
0.27
0.13
0.81
0.95
2003
1,300
1.04
0.28
0.17
0.76
0.87
2002
1,500
1.12
0.4
0.15
0.72
0.97
2001
2,000
0.99
0.06
0.04
0.93
0.95
2000
2,750
1.16
0.06
0.06
1.1
1.1
1999
3,500
0.96
0.14
0.14
0.82
0.82
2500
210
0.10
0.10
1.66
2.00
Year
1.70
Projections for 2011
2011
1,900 cfs
12/2007
2009
1,900 cfs
12/2007
Date
River
St Xavier
Gage
Flow
(cfs)
Shift (ft)
Approximate River Mile
1
3
6
11
15
20
August 6, 2009
3348
-0.16
2.32
2.29
1.53
1.30
1.70
1.29
September 16,
2009
3106
-1.68
3.68
2.80
1.82
1.50
1.70
1.39
September 24,
2009
2970
-1.83
3.64
2.80
1.80
1.55
1.75
1.38
378
-1.67
1.32
0.51
0.27
0.25
0.05
0.09
Difference
2010
1,900 cfs
12/2007
Date
River
St Xavier
Gage
Flow
(cfs)
Shift (ft)
Approximate River Mile
1
3
6
13
15
20
August 20, 2010
2500
-1.19
2.55
1.39
1.81
1.47
Sept. 14, 2010
2500
-2.06
2.68
1.46
1.78
1.50
Sept. 23, 2010
2500
-2.10
2.69
1.46
1.76
1.43
0
-0.91
0.14
0.07
-0.05
-0.04
Difference (Aug
20-Sep. 23)
Possible Option to Reduce Impact of Stage Shift
Constant
Modified Estimated
Drop (ft.)
Total
2009
Flow CFS
Flow CFS
Shift
Oct
2500
2,250
2.10
61.90
Nov
2500
2,300
1.6
61.44
0.46
0.46
Dec
2500
2,400
0.7
60.62
0.82
1.28
Jan
2500
2,600
0.20
60.28
0.34
1.62
Feb
2500
2,700
0.10
60.26
0.02
1.64
Mar
2500
2,650
0.15
60.27
-0.01
1.63
Apr
2500
2,600
0.18
60.26
0.01
1.64
1.92
Avg.
2,500
2,500
Gage Ht. Increment Drop (ft.)
Shift
Total Shift
1.64
0.28
Shift Reduced
Another Option to Reduce Impact of Stage Shift
Constant
Modified Estimated
Drop (ft.)
Total
2009
Flow CFS
Flow CFS
Shift
Gage Ht. Increment Drop (ft.)
Oct
2500
2,350
2.10
61.98
Nov
2500
2,400
1.6
61.52
0.46
0.46
Dec
2500
2,450
0.7
60.66
0.86
1.32
Jan
2500
2,550
0.20
60.24
0.42
1.74
Feb
2500
2,650
0.10
60.22
0.02
1.76
Mar
2500
2,550
0.15
60.19
0.03
1.79
Apr
2500
2,550
0.18
60.22
+0.03
1.76
1.92 Shift
Avg.
2,500
2,500
Total Drop
1.76
0.16
Shift Reduced
1,900 cfs
12/2007
Questions?
Questions?
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