Site ID: 536 Lat. 65.4495 USA Alaska
River: Koyukuk Long. -157.6285
Site name: Koyukuk Contributing area: 76755 km2 Ratio to Comparison Station: 2.72
Latest measurement: 17-Jul-10 Mean annual runoff: 45 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 9.6 mm
Latest M/C ratio: 1.14 Seven day total: 0.7 mm
Estimated current discharge: 146 m3/sec Percent of mean 7-day total: 48.8 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1516 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1535 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Boluo (2186950)           Contributing Area:   sq mi 28239 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Final calibration to discharge has not yet been accomplished.
Discharge and runoff, based on satellite remote sensing (NASA AMSR-E data)
(For U.S, sites, nearby ground station discharge may also be shown)
Annual  Monthly Total Runoff (mm), computed from above satellite-based discharge data
Runoff
(mm) Jan Feb Mar April May June July Aug Sept Oct Nov Dec
14 2002 no data no data no data no data no data no data no data 5.0 5.2 3.3 0.1 0.7
48 2003 0.3 0.4 0.2 0.1 4.5 14.2 6.9 6.3 7.9 7.2 0.2 0.1
33 2004 0.1 0.1 0.1 0.1 13.2 12.3 2.7 2.1 2.2 0.1 0.1 0.1
118 2005 0.1 0.1 0.1 0.1 26.3 51.7 21.3 9.0 8.2 1.2 0.1 0.1
31 2006 0.1 0.1 0.0 0.1 8.4 16.1 6.1 0.2 0.0 0.0 0.0 0.0
13 2007 0.1 0.1 0.0 0.1 1.5 5.1 1.6 1.6 3.0 0.1 0.1 0.1
27 2008 0.1 0.1 0.1 0.1 9.5 10.8 3.3 1.6 1.2 0.1 0.1 0.1
40 2009 0.1 0.1 0.1 0.1 8.8 21.3 6.4 1.1 1.5 0.4 0.1 0.1
10 2010 0.1 0.1 0.1 0.1 3.3 4.1 1.8 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 45 Standard Deviation: 6.4
Trend in Annual Runoff (slope):  -73
Discharge is estimated via a rating equation directly from the remote sensing data (M/C ratio) shown below.
Green line records upwelling microwave emission from within 5 km radius of a calbration land target. 
Explanation:   Blue line is emission from within 5 km radius of the measurement target centered over the river.
Brown line is their ratio (M/C; "HR" in Brakenridge et al 2007; scale on right) and is used to estimate river discharge via a rating equation.
Rating equations are being developed and applied on an individual basis using available ground-based discharge information.
GoogleEarth View of Measurement Site
Return
Estimated
Disharge
Data
Date m3/sec
22-Jul-02 390
23-Jul-02 390
24-Jul-02 353
25-Jul-02 174
26-Jul-02 82
27-Jul-02 3
28-Jul-02 3
29-Jul-02 80
30-Jul-02 200
31-Jul-02 272
1-Aug-02 273
2-Aug-02 387
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 38
10-Aug-02 82
11-Aug-02 77
12-Aug-02 114
13-Aug-02 148
14-Aug-02 189
15-Aug-02 240
16-Aug-02 261
17-Aug-02 193
18-Aug-02 114
19-Aug-02 3
20-Aug-02 7
21-Aug-02 68
22-Aug-02 129
23-Aug-02 226
24-Aug-02 223
25-Aug-02 230
26-Aug-02 235
27-Aug-02 270
28-Aug-02 259
29-Aug-02 265
30-Aug-02 224
31-Aug-02 169
1-Sep-02 146
2-Sep-02 181
3-Sep-02 141
4-Sep-02 112
5-Sep-02 99
6-Sep-02 7
7-Sep-02 8
8-Sep-02 44
9-Sep-02 133
10-Sep-02 153
11-Sep-02 123
12-Sep-02 128
13-Sep-02 56
14-Sep-02 82
15-Sep-02 97
16-Sep-02 56
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 303
22-Sep-02 324
23-Sep-02 335
24-Sep-02 281
25-Sep-02 306
26-Sep-02 295
27-Sep-02 353
28-Sep-02 337
29-Sep-02 273
30-Sep-02 266
1-Oct-02 241
2-Oct-02 309
3-Oct-02 309
4-Oct-02 320
5-Oct-02 319
6-Oct-02 280
7-Oct-02 237
8-Oct-02 109
9-Oct-02 139
10-Oct-02 121
11-Oct-02 112
12-Oct-02 181
13-Oct-02 102
14-Oct-02 59
15-Oct-02 15
16-Oct-02 3
17-Oct-02 6
18-Oct-02 3
19-Oct-02 3
20-Oct-02 3
21-Oct-02 3
22-Oct-02 3
23-Oct-02 3
24-Oct-02 3
25-Oct-02 3
26-Oct-02 3
27-Oct-02 3
28-Oct-02 3
29-Oct-02 3
30-Oct-02 3
31-Oct-02 3
1-Nov-02 3
2-Nov-02 3
3-Nov-02 3
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1-Dec-02 3
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6-Dec-02 3
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8-Dec-02 3
9-Dec-02 3
10-Dec-02 3
11-Dec-02 3
12-Dec-02 3
13-Dec-02 73
14-Dec-02 3
15-Dec-02 3
16-Dec-02 19
17-Dec-02 3
18-Dec-02 21
19-Dec-02 17
20-Dec-02 38
21-Dec-02 95
22-Dec-02 102
23-Dec-02 84
24-Dec-02 53
25-Dec-02 38
26-Dec-02 16
27-Dec-02 3
28-Dec-02 3
29-Dec-02 3
30-Dec-02 3
31-Dec-02 3
1-Jan-03 3
2-Jan-03 3
3-Jan-03 3
4-Jan-03 3
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13-Jan-03 3
14-Jan-03 3
15-Jan-03 31
16-Jan-03 21
17-Jan-03 60
18-Jan-03 15
19-Jan-03 3
20-Jan-03 14
21-Jan-03 3
22-Jan-03 3
23-Jan-03 3
24-Jan-03 3
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1-Feb-03 3
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14-Feb-03 51
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22-Feb-03
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24-Feb-03
25-Feb-03 3
26-Feb-03 3
27-Feb-03 114
28-Feb-03 159
1-Mar-03 148
2-Mar-03 3
3-Mar-03 3
4-Mar-03 3
5-Mar-03 3
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12-May-03 88
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