Site ID: 135 Lat. 29.0001 China Hunan
River: Yuan Long. 111.8464
Site name: Changde Contributing area: 74615 km2 Ratio to Comparison Station: 0.14
Latest measurement: 29-Jul-10 Mean annual runoff: 467 mm (2003-2009)
Hydrologic status: 3 Flood Total runoff this year (2010): 281.6 mm
Latest M/C ratio: 1.58 Seven day total: 13.7 mm
Estimated current discharge: 2052 m3/sec Percent of mean 7-day total: 103.6 % (today's value compared to mean for same period, 2003-2009)
Ice-cover determination: 5 yr recurrence flood: 2604 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 2585 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Pakse (2469260)           Contributing Area:   sq mi 536010 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Calibration to nearby ground station 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
168 2002 no data no data no data no data no data no data no data 36.4 33.1 37.2 29.5 31.3
435 2003 32.1 28.1 31.2 30.1 41.5 34.6 41.8 48.9 35.9 42.5 29.6 38.8
446 2004 33.3 37.9 34.7 34.2 37.2 31.9 35.9 40.7 37.0 40.9 43.5 38.7
470 2005 39.1 31.0 41.4 36.1 37.8 36.1 34.5 47.2 43.6 42.3 41.3 39.7
411 2006 26.4 32.7 36.8 32.9 39.7 44.0 44.7 52.0 51.1 50.6 0.0 0.0
501 2007 33.6 37.7 38.1 36.0 29.8 33.7 60.3 67.1 45.4 47.2 42.2 30.4
488 2008 25.4 22.6 28.9 40.6 31.9 29.8 52.9 63.2 59.5 47.1 50.4 35.9
516 2009 34.1 27.4 33.6 41.0 29.6 33.7 60.0 60.9 51.9 50.2 47.5 46.3
282 2010 39.9 35.8 45.8 42.0 33.8 32.5 48.2 3.5 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 467 Standard Deviation: 6.4
Trend in Annual Runoff (slope):  5.9
Discharge is estimated via a rating equation directly from the remote sensing data (M/C ratio) shown below.
Explanation:   Green line records upwelling microwave emission from within 5 km radius of a calbration land target; blue line is emission from within 5 km radious of the measurement target centered over the river.
Brown line is their ratio (M/C; 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. For calibration status, see "notes" entry, above.
GoogleEarth View of Measurement Site
Return
Estimated
Disharge
Data
Date m3/sec
22-Jul-02 5
23-Jul-02 5
24-Jul-02 137
25-Jul-02 74
26-Jul-02 234
27-Jul-02 575
28-Jul-02 549
29-Jul-02 549
30-Jul-02 416
31-Jul-02 416
1-Aug-02 293
2-Aug-02 293
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 1463
10-Aug-02 1463
11-Aug-02 1416
12-Aug-02 1416
13-Aug-02 749
14-Aug-02 749
15-Aug-02 85
16-Aug-02 570
17-Aug-02 922
18-Aug-02 1158
19-Aug-02 1521
20-Aug-02 1532
21-Aug-02 1720
22-Aug-02 1529
23-Aug-02 1869
24-Aug-02 1820
25-Aug-02 1808
26-Aug-02 1914
27-Aug-02 1494
28-Aug-02 1523
29-Aug-02 1436
30-Aug-02 1436
31-Aug-02 1282
1-Sep-02 1563
2-Sep-02 1479
3-Sep-02 1398
4-Sep-02 1539
5-Sep-02 1314
6-Sep-02 1307
7-Sep-02 1494
8-Sep-02 1421
9-Sep-02 909
10-Sep-02 1029
11-Sep-02 869
12-Sep-02 643
13-Sep-02 1001
14-Sep-02 625
15-Sep-02 625
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 1326
22-Sep-02 1326
23-Sep-02 1139
24-Sep-02 1097
25-Sep-02 1042
26-Sep-02 1057
27-Sep-02 1081
28-Sep-02 1137
29-Sep-02 1146
30-Sep-02 1019
1-Oct-02 1019
2-Oct-02 884
3-Oct-02 1036
4-Oct-02 1203
5-Oct-02 1161
6-Oct-02 1260
7-Oct-02 1155
8-Oct-02 1053
9-Oct-02 985
10-Oct-02 1014
11-Oct-02 949
12-Oct-02 1046
13-Oct-02 1099
14-Oct-02 1224
15-Oct-02 1418
16-Oct-02 1220
17-Oct-02 1220
18-Oct-02 923
19-Oct-02 995
20-Oct-02 882
21-Oct-02 883
22-Oct-02 881
23-Oct-02 687
24-Oct-02 719
25-Oct-02 810
26-Oct-02 932
27-Oct-02 1123
28-Oct-02 1143
29-Oct-02 1174
30-Oct-02 1043
31-Oct-02 1000
1-Nov-02 707
2-Nov-02 707
3-Nov-02 710
4-Nov-02 876
5-Nov-02 1034
6-Nov-02 935
7-Nov-02 979
8-Nov-02 1006
9-Nov-02 948
10-Nov-02 1088
11-Nov-02 1039
12-Nov-02 871
13-Nov-02 625
14-Nov-02 535
15-Nov-02 621
16-Nov-02 527
17-Nov-02 1038
18-Nov-02 1038
19-Nov-02 988
20-Nov-02 663
21-Nov-02 567
22-Nov-02 679
23-Nov-02 553
24-Nov-02 789
25-Nov-02 893
26-Nov-02 838
27-Nov-02 993
28-Nov-02 1055
29-Nov-02 1062
30-Nov-02 1118
1-Dec-02 993
2-Dec-02 1020
3-Dec-02 932
4-Dec-02 932
5-Dec-02 811
6-Dec-02 674
7-Dec-02 519
8-Dec-02 642
9-Dec-02 623
10-Dec-02 720
11-Dec-02 839
12-Dec-02 688
13-Dec-02 946
14-Dec-02 1017
15-Dec-02 1000
16-Dec-02 1133
17-Dec-02 734
18-Dec-02 638
19-Dec-02 765
20-Dec-02 765
21-Dec-02 1247
22-Dec-02 1111
23-Dec-02 1154
24-Dec-02 1146
25-Dec-02 1071
26-Dec-02 959
27-Dec-02 833
28-Dec-02 662
29-Dec-02 693
30-Dec-02 856
31-Dec-02 871
1-Jan-03 918
2-Jan-03 1028
3-Jan-03 997
4-Jan-03 989
5-Jan-03 989
6-Jan-03 874
7-Jan-03 902
8-Jan-03 904
9-Jan-03 896
10-Jan-03 912
11-Jan-03 1027
12-Jan-03 1092
13-Jan-03 1098
14-Jan-03 1098
15-Jan-03 885
16-Jan-03 1048
17-Jan-03 1136
18-Jan-03 1134
19-Jan-03 1262
20-Jan-03 983
21-Jan-03 983
22-Jan-03 914
23-Jan-03 879
24-Jan-03 773
25-Jan-03 528
26-Jan-03 396
27-Jan-03 346
28-Jan-03 270
29-Jan-03 818
30-Jan-03 782
31-Jan-03 855
1-Feb-03 873
2-Feb-03 811
3-Feb-03 760
4-Feb-03 738
5-Feb-03 787
6-Feb-03 787
7-Feb-03 1010
8-Feb-03 984
9-Feb-03 1077
10-Feb-03 910
11-Feb-03 910
12-Feb-03 736
13-Feb-03 516
14-Feb-03 574
15-Feb-03 669
16-Feb-03 787
17-Feb-03 964
18-Feb-03 1050
19-Feb-03 1120
20-Feb-03 1297
21-Feb-03 928
22-Feb-03 928
23-Feb-03 814
24-Feb-03 1006
25-Feb-03 1053
26-Feb-03 845
27-Feb-03 840
28-Feb-03 506
1-Mar-03 304
2-Mar-03 545
3-Mar-03 739
4-Mar-03 810
5-Mar-03 717
6-Mar-03 739