Site ID: 517 Lat. 37.7621 USA Illinois
River: Mississippi Long. -89.6668
Site name: Chester Contributing area: 1818931 km2 Ratio to Comparison Station: 64.41
Latest measurement: 18-Jul-10 Mean annual runoff: 4 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 4.4 mm
Latest M/C ratio: 1.28 Seven day total: 0.2 mm
Estimated current discharge: 676 m3/sec Percent of mean 7-day total: 260.0 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1590 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1544 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
1 2002 no data no data no data no data no data no data no data 0.1 0.1 0.0 0.2 0.5
4 2003 0.3 0.2 0.5 0.5 1.1 0.6 0.3 0.1 0.1 0.0 0.2 0.2
4 2004 0.3 0.2 0.4 0.6 0.8 0.7 0.3 0.1 0.1 0.1 0.3 0.5
3 2005 0.8 0.5 0.2 0.6 0.2 0.2 0.1 0.1 0.1 0.1 0.2 0.2
3 2006 0.3 0.2 0.4 0.6 0.3 0.2 0.2 0.2 0.2 0.2 0.0 0.0
3 2007 0.2 0.2 0.4 0.5 0.6 0.2 0.3 0.2 0.2 0.2 0.2 0.2
7 2008 0.1 0.3 0.7 1.4 1.3 0.7 0.8 0.6 0.4 0.3 0.3 0.1
6 2009 0.1 0.3 0.5 0.9 1.3 0.6 0.4 0.3 0.3 0.1 0.8 0.3
4 2010 0.2 0.1 0.7 1.0 0.9 0.8 0.6 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 4 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-02 197
23-Jul-02 197
24-Jul-02 288
25-Jul-02 35
26-Jul-02 43
27-Jul-02 32
28-Jul-02 122
29-Jul-02 204
30-Jul-02 241
31-Jul-02 269
1-Aug-02 188
2-Aug-02 191
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02
10-Aug-02 3
11-Aug-02 126
12-Aug-02 31
13-Aug-02 54
14-Aug-02 43
15-Aug-02 3
16-Aug-02 5
17-Aug-02 8
18-Aug-02 65
19-Aug-02 3
20-Aug-02 35
21-Aug-02 3
22-Aug-02 3
23-Aug-02 3
24-Aug-02 3
25-Aug-02 318
26-Aug-02 99
27-Aug-02 181
28-Aug-02 57
29-Aug-02 75
30-Aug-02 68
31-Aug-02 3
1-Sep-02 3
2-Sep-02 3
3-Sep-02 3
4-Sep-02 111
5-Sep-02 157
6-Sep-02 142
7-Sep-02 149
8-Sep-02 160
9-Sep-02 97
10-Sep-02 110
11-Sep-02 82
12-Sep-02 16
13-Sep-02 3
14-Sep-02 3
15-Sep-02 3
16-Sep-02 9
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 3
22-Sep-02 3
23-Sep-02 3
24-Sep-02 3
25-Sep-02 3
26-Sep-02 3
27-Sep-02 3
28-Sep-02 3
29-Sep-02 3
30-Sep-02 3
1-Oct-02 3
2-Oct-02 3
3-Oct-02 3
4-Oct-02 3
5-Oct-02 3
6-Oct-02 3
7-Oct-02 3
8-Oct-02 31
9-Oct-02 15
10-Oct-02 3
11-Oct-02 3
12-Oct-02 3
13-Oct-02 3
14-Oct-02 20
15-Oct-02 22
16-Oct-02 32
17-Oct-02 3
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
4-Nov-02 3
5-Nov-02 3
6-Nov-02 3
7-Nov-02 109
8-Nov-02 151
9-Nov-02 203
10-Nov-02 231
11-Nov-02 244
12-Nov-02 322
13-Nov-02 395
14-Nov-02 328
15-Nov-02 403
16-Nov-02 195
17-Nov-02 275
18-Nov-02 261
19-Nov-02 159
20-Nov-02 260
21-Nov-02 175
22-Nov-02 185
23-Nov-02 192
24-Nov-02 140
25-Nov-02 89
26-Nov-02 43
27-Nov-02 26
28-Nov-02 3
29-Nov-02 3
30-Nov-02 3
1-Dec-02 111
2-Dec-02 160
3-Dec-02 105
4-Dec-02 107
5-Dec-02 19
6-Dec-02 3
7-Dec-02 157
8-Dec-02 187
9-Dec-02 404
10-Dec-02 360
11-Dec-02 283
12-Dec-02 255
13-Dec-02 197
14-Dec-02 150
15-Dec-02 153
16-Dec-02 197
17-Dec-02 305
18-Dec-02 256
19-Dec-02 294
20-Dec-02 431
21-Dec-02 484
22-Dec-02 660
23-Dec-02 655
24-Dec-02 587
25-Dec-02 186
26-Dec-02 339
27-Dec-02 362
28-Dec-02 499
29-Dec-02 622
30-Dec-02 845
31-Dec-02 1041
1-Jan-03 950
2-Jan-03 721
3-Jan-03 360
4-Jan-03 309
5-Jan-03 412
6-Jan-03 257
7-Jan-03 249
8-Jan-03 235
9-Jan-03 246
10-Jan-03 340
11-Jan-03 285
12-Jan-03 259
13-Jan-03 191
14-Jan-03 41
15-Jan-03 56
16-Jan-03 61
17-Jan-03 107
18-Jan-03 76
19-Jan-03 20
20-Jan-03 52
21-Jan-03 89
22-Jan-03 57
23-Jan-03 71
24-Jan-03 3
25-Jan-03 3
26-Jan-03 3
27-Jan-03 3
28-Jan-03 3
29-Jan-03 3
30-Jan-03 8
31-Jan-03 3
1-Feb-03 3
2-Feb-03 36
3-Feb-03 167
4-Feb-03 302
5-Feb-03 309
6-Feb-03 280
7-Feb-03 180
8-Feb-03 151
9-Feb-03 20
10-Feb-03 3
11-Feb-03 3
12-Feb-03 3
13-Feb-03 30
14-Feb-03 45
15-Feb-03 3
16-Feb-03 60
17-Feb-03 85
18-Feb-03 92
19-Feb-03 248
20-Feb-03 201
21-Feb-03 350
22-Feb-03 412
23-Feb-03 396
24-Feb-03 507
25-Feb-03 224
26-Feb-03 152
27-Feb-03 63
28-Feb-03 104
1-Mar-03 203
2-Mar-03 310
3-Mar-03 375
4-Mar-03 309
5-Mar-03 320
6-Mar-03 190
7-Mar-03 170
8-Mar-03 227
9-Mar-03 257
10-Mar-03 206
11-Mar-03 191
12-Mar-03 200
13-Mar-03 131
14-Mar-03 103
15-Mar-03 248
16-Mar-03 371
17-Mar-03 479
18-Mar-03 462
19-Mar-03 497
20-Mar-03 353
21-Mar-03 296
22-Mar-03 337
23-Mar-03 439
24-Mar-03 526 <