Site ID: 2149 Lat. 30.6584 China Hubei
River: Yangtze Long. 111.3167
Site name: Yichang Contributing area: 998711 km2 Ratio to Comparison Station: 35.37
Latest measurement: 6-Sep-11 Mean annual runoff: 9 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 13.1 mm
Latest M/C ratio: 1.10 Seven day total: 0.2 mm
Estimated current discharge: 3 m3/sec Percent of mean 7-day total: 111.5 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1018 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 991 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
2 2002 no data no data no data no data no data no data no data 0.5 0.4 0.4 0.2 0.3
5 2003 0.4 0.4 0.5 0.7 0.6 0.4 0.4 0.2 0.4 0.1 0.1 0.1
3 2004 0.1 0.3 0.7 0.7 0.5 0.2 0.1 0.1 0.0 0.0 0.0 0.0
10 2005 0.0 0.1 0.8 1.0 1.0 1.0 0.7 0.9 1.2 1.1 1.2 1.1
10 2006 0.8 0.8 1.4 1.3 1.0 0.8 0.9 0.7 1.1 1.0 0.0 0.0
12 2007 0.9 1.1 0.9 1.1 1.2 0.7 1.0 1.1 1.0 0.8 1.2 0.8
12 2008 0.5 0.4 1.2 1.3 1.2 1.0 0.8 0.9 1.0 1.2 1.2 1.1
12 2009 1.1 0.7 1.2 1.2 1.0 0.8 1.2 0.9 0.9 1.0 1.0 0.6
13 2010 1.1 0.7 1.1 1.1 0.7 0.6 1.0 1.0 0.8 1.2 1.4 2.4
Mean Annual Runoff (mm): 9 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-02 222
23-Jul-02 222
24-Jul-02 287
25-Jul-02 259
26-Jul-02 257
27-Jul-02 590
28-Jul-02 430
29-Jul-02 442
30-Jul-02 231
31-Jul-02 231
1-Aug-02 248
2-Aug-02 38
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 290
10-Aug-02 290
11-Aug-02 182
12-Aug-02 182
13-Aug-02 26
14-Aug-02 69
15-Aug-02 132
16-Aug-02 267
17-Aug-02 372
18-Aug-02 451
19-Aug-02 544
20-Aug-02 287
21-Aug-02 287
22-Aug-02 286
23-Aug-02 247
24-Aug-02 183
25-Aug-02 240
26-Aug-02 196
27-Aug-02 298
28-Aug-02 446
29-Aug-02 378
30-Aug-02 265
31-Aug-02 16
1-Sep-02 138
2-Sep-02 93
3-Sep-02 289
4-Sep-02 609
5-Sep-02 445
6-Sep-02 445
7-Sep-02 3
8-Sep-02 270
9-Sep-02 245
10-Sep-02 259
11-Sep-02 432
12-Sep-02 163
13-Sep-02 179
14-Sep-02 56
15-Sep-02 56
16-Sep-02
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-02 187
25-Sep-02 105
26-Sep-02 149
27-Sep-02 222
28-Sep-02 133
29-Sep-02 369
30-Sep-02 285
1-Oct-02 199
2-Oct-02 152
3-Oct-02 183
4-Oct-02 202
5-Oct-02 305
6-Oct-02 306
7-Oct-02 215
8-Oct-02 215
9-Oct-02 243
10-Oct-02 285
11-Oct-02 106
12-Oct-02 176
13-Oct-02 106
14-Oct-02 16
15-Oct-02 252
16-Oct-02 42
17-Oct-02 68
18-Oct-02 3
19-Oct-02 58
20-Oct-02 82
21-Oct-02 189
22-Oct-02 343
23-Oct-02 169
24-Oct-02 169
25-Oct-02 3
26-Oct-02 94
27-Oct-02 85
28-Oct-02 149
29-Oct-02 226
30-Oct-02 87
31-Oct-02 182
1-Nov-02 202
2-Nov-02 177
3-Nov-02 93
4-Nov-02 220
5-Nov-02 165
6-Nov-02 115
7-Nov-02 291
8-Nov-02 3
9-Nov-02 3
10-Nov-02 3
11-Nov-02 3
12-Nov-02 3
13-Nov-02 3
14-Nov-02 21
15-Nov-02 3
16-Nov-02 3
17-Nov-02 3
18-Nov-02 7
19-Nov-02 3
20-Nov-02 3
21-Nov-02 3
22-Nov-02 82
23-Nov-02 282
24-Nov-02 341
25-Nov-02 341
26-Nov-02 3
27-Nov-02 69
28-Nov-02 42
29-Nov-02 74
30-Nov-02 158
1-Dec-02 240
2-Dec-02 319
3-Dec-02 200
4-Dec-02 103
5-Dec-02 3
6-Dec-02 3
7-Dec-02 3
8-Dec-02 6
9-Dec-02 132
10-Dec-02 158
11-Dec-02 158
12-Dec-02 238
13-Dec-02 278
14-Dec-02 59
15-Dec-02 86
16-Dec-02 45
17-Dec-02 3
18-Dec-02 12
19-Dec-02 59
20-Dec-02 96
21-Dec-02 135
22-Dec-02 79
23-Dec-02 21
24-Dec-02 51
25-Dec-02 85
26-Dec-02 122
27-Dec-02 122
28-Dec-02 3
29-Dec-02 35
30-Dec-02 18
31-Dec-02 74
1-Jan-03 109
2-Jan-03 88
3-Jan-03 165
4-Jan-03 50
5-Jan-03 122
6-Jan-03 32
7-Jan-03 95
8-Jan-03 119
9-Jan-03 38
10-Jan-03 150
11-Jan-03 82
12-Jan-03 82
13-Jan-03 171
14-Jan-03 274
15-Jan-03 179
16-Jan-03 225
17-Jan-03 239
18-Jan-03 242
19-Jan-03 439
20-Jan-03 362
21-Jan-03 365
22-Jan-03 192
23-Jan-03 259
24-Jan-03 272
25-Jan-03 205
26-Jan-03 320
27-Jan-03 120
28-Jan-03 120
29-Jan-03 3
30-Jan-03 3
31-Jan-03 3
1-Feb-03 18
2-Feb-03 134
3-Feb-03 79
4-Feb-03 198
5-Feb-03 244
6-Feb-03 359
7-Feb-03 512
8-Feb-03 512
9-Feb-03 607
10-Feb-03 383
11-Feb-03 383
12-Feb-03 284
13-Feb-03 194
14-Feb-03 3
15-Feb-03 3
16-Feb-03 3
17-Feb-03 3
18-Feb-03 46
19-Feb-03 220
20-Feb-03 301
21-Feb-03 99
22-Feb-03 3
23-Feb-03 3
24-Feb-03 3
25-Feb-03 3
26-Feb-03 144
27-Feb-03 205
28-Feb-03 3
1-Mar-03 3
2-Mar-03 43
3-Mar-03 240
4-Mar-03 267
5-Mar-03 141
6-Mar-03 106
7-Mar-03 3
8-Mar-03 3
9-Mar-03 286
10-Mar-03 385
11-Mar-03 149
12-Mar-03 167
13-Mar-03 127
14-Mar-03 3
15-Mar-03 88
16-Mar-03 3
17-Mar-03 3
18-Mar-03 27