River Watch Version 3.4 G. R. Brakenridge*
Experimental Satellite-Based River Discharge Measurements using passive microwave radiometry Signal/Model agreement: Good T. De Groeve**
Sagavanirktok Center: -148.724  Long. S/N rating: Very Good S. Cohen***
GFDS Site Number 881 Predicted Flooded Area USA Center: 69.974  Lat. S.V. Nghiem****
GEE Time Lapse Learn more about this river 11865 sq km Station contributing area A. J. Kettner*
Last measured: 24-Jul-17 Obtain Data J.P.M. Syvitski*
Discharge: 37 m3/sec 37 Status: 2 (1, low; 2, normal flow; 3, moderate flood, r >1.5 y; 4, major flood, r >5 y) *CSDMS/INSTAAR, University of Colorado
7-day Runoff 2.2 mm 93% (7-day runoff compared to 8 y average for this date, 2003-2010) **Joint Research Centre, Ispra, Italy
Flood Magnitude: 0.0 Scale of 0-10 Flood Magnitude Defined Technical Summary ***University of Alabama
****Jet Propulsion Laboratory, California
Sensors: AMSR-E, AMSR-2, GPM
Modeled sub-ice flow: 7 m3/sec
Ice-cover detection operates during:
Sept. 9-Oct. 31
May 8 -May 30
Annual Maximum Discharge
2003 623 m3/sec
2004 442 m3/sec
2005 277 m3/sec
2006 218 m3/sec
2007 523 m3/sec
2008 407 m3/sec
2009 677 m3/sec
2010 644 m3/sec
Notes: 4-day forward moving average is applied.
Low flow threshold is 20th percentile discharge for this day, 2003-2010.
2014 403 m3/sec
2015 682 m3/sec
Flood Frequency Analysis, 2002-2015
25 yr*
808 m3/sec
10 yr*
719 m3/sec
5 yr (major flood)*
634 m3/sec
1.5 yr (bankfull flood)*
392 m3/sec
Mean Discharge
34 m3/sec
*From Log Pearson III 
Low Flow Threshold: #N/A m3/sec
See also:  http://floodobservatory.colorado.edu/881IceCoverValidationviaMODIS.pdf 7 m3/sec Modeled Dec.-March average (for today)
Chronology of Flood Magnitudes
Signal/Model r2 0.52
Signal/Model Agreement Good
Nash-Sutcliffe statistic*: 0.52
*See Technical Summary
Mean
Annual Ice- Mean Runoff Runoff
 Monthly Runoff (total of daily runoff for each month; mm) Total free Discharge % of 2002-2011
Jan Feb Mar April May June July Aug Sept Oct Nov Dec  (mm) days  (m3/sec) Mean 81
Mean
Annual
Discharge
2002 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 2003-2011
2003 1.6 1.5 1.6 1.5 7.0 41.6 15.9 15.5 8.9 4.6 1.5 1.6 103.0 157 39 127% 32
2004 1.6 1.4 1.6 1.5 10.8 42.7 13.4 13.7 12.5 2.4 1.5 1.6 104.8 133 39 130%
2005 1.6 1.4 1.6 1.5 1.6 29.2 13.2 8.1 7.8 1.6 1.5 1.6 70.9 123 27 88%
2006 1.6 1.4 1.6 1.5 2.3 23.0 8.7 8.9 10.4 11.7 1.5 1.6 74.3 151 28 92%
2007 1.6 1.5 1.6 1.5 3.6 30.7 8.4 8.1 7.9 1.6 1.5 1.6 69.8 127 26 86%
2008 1.6 1.4 1.6 1.5 10.0 28.8 8.1 8.0 8.1 2.9 1.5 1.6 75.3 139 28 93%
2009 1.6 1.4 1.6 1.5 8.9 49.0 11.6 10.2 11.3 1.6 1.6