Site ID: 257 Lat. 15.5249 Thailand Nakhon Sawan
River: Chao Phraya Long. 100.0988
Site name: Nakhon Sawan Contributing area: 113212 km2 Ratio to Comparison Station: 0.21
Latest measurement: 30-Jul-10 Mean annual runoff: 97 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 32.8 mm
Latest M/C ratio: 1.10 Seven day total: 0.0 mm
Estimated current discharge: 3 m3/sec Percent of mean 7-day total: 11.6 % (today's value compared to mean for same period, 2003-2009)
Ice-cover determination: 5 yr recurrence flood: 3499 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 3586 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
18 2002 no data no data no data no data no data no data no data 0.2 1.9 8.6 5.5 1.8
12 2003 0.4 0.3 0.2 2.3 4.5 1.6 0.1 0.1 0.6 0.9 0.3 0.1
6 2004 0.1 0.1 0.1 1.0 0.1 0.1 0.1 0.1 3.3 0.1 0.3 0.6
144 2005 0.1 0.1 3.9 11.1 4.1 0.7 0.8 2.7 3.0 10.8 73.6 33.5
115 2006 8.4 0.7 4.2 8.6 5.8 1.6 1.4 4.5 8.4 71.6 0.0 0.0
135 2007 12.2 2.8 3.2 17.6 0.8 0.1 0.2 0.9 6.4 26.2 39.6 24.7
138 2008 10.9 1.2 2.3 15.3 9.9 0.1 0.1 1.8 8.4 16.4 38.7 33.4
127 2009 13.4 2.0 1.0 13.1 7.1 0.1 1.0 1.8 3.9 21.7 35.1 26.5
33 2010 5.7 0.3 6.7 14.9 4.3 0.7 0.1 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 97 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 3
23-Jul-02 3
24-Jul-02 3
25-Jul-02 3
26-Jul-02 3
27-Jul-02 3
28-Jul-02 3
29-Jul-02 3
30-Jul-02 145
31-Jul-02 159
1-Aug-02 159
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 3
10-Aug-02 3
11-Aug-02 3
12-Aug-02 3
13-Aug-02 3
14-Aug-02 3
15-Aug-02 3
16-Aug-02 3
17-Aug-02 3
18-Aug-02 3
19-Aug-02 3
20-Aug-02 3
21-Aug-02 3
22-Aug-02 3
23-Aug-02 3
24-Aug-02 3
25-Aug-02 3
26-Aug-02 3
27-Aug-02 3
28-Aug-02 3
29-Aug-02 3
30-Aug-02 3
31-Aug-02 3
1-Sep-02 3
2-Sep-02 3
3-Sep-02 3
4-Sep-02 3
5-Sep-02 3
6-Sep-02 6
7-Sep-02 273
8-Sep-02 300
9-Sep-02 300
10-Sep-02 135
11-Sep-02 44
12-Sep-02 3
13-Sep-02 3
14-Sep-02 3
15-Sep-02 3
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02
22-Sep-02 10
23-Sep-02 10
24-Sep-02 59
25-Sep-02 59
26-Sep-02 3
27-Sep-02 62
28-Sep-02 159
29-Sep-02 385
30-Sep-02 597
1-Oct-02 1332
2-Oct-02 1837
3-Oct-02 903
4-Oct-02 903
5-Oct-02 33
6-Oct-02 17
7-Oct-02 174
8-Oct-02 197
9-Oct-02 115
10-Oct-02 124
11-Oct-02 124
12-Oct-02 3
13-Oct-02 406
14-Oct-02 377
15-Oct-02 281
16-Oct-02 413
17-Oct-02 404
18-Oct-02 683
19-Oct-02 683
20-Oct-02 683
21-Oct-02 3
22-Oct-02 3
23-Oct-02 3
24-Oct-02 3
25-Oct-02 3
26-Oct-02 550
27-Oct-02 550
28-Oct-02 203
29-Oct-02 224
30-Oct-02 3
31-Oct-02 3
1-Nov-02 3
2-Nov-02 3
3-Nov-02 114
4-Nov-02 3
5-Nov-02 3
6-Nov-02 3
7-Nov-02 28
8-Nov-02 268
9-Nov-02 734
10-Nov-02 1089
11-Nov-02 1013
12-Nov-02 1013
13-Nov-02 24
14-Nov-02 48
15-Nov-02 3
16-Nov-02 3
17-Nov-02 3
18-Nov-02 3
19-Nov-02 3
20-Nov-02 162
21-Nov-02 325
22-Nov-02 358
23-Nov-02 97
24-Nov-02 3
25-Nov-02 3
26-Nov-02 3
27-Nov-02 314
28-Nov-02 314
29-Nov-02 696
30-Nov-02 525
1-Dec-02 20
2-Dec-02 3
3-Dec-02 3
4-Dec-02 3
5-Dec-02 179
6-Dec-02 85
7-Dec-02 85
8-Dec-02 3
9-Dec-02 3
10-Dec-02 3
11-Dec-02 3
12-Dec-02 64
13-Dec-02 3
14-Dec-02 3
15-Dec-02 3
16-Dec-02 105
17-Dec-02 3
18-Dec-02 121
19-Dec-02 193
20-Dec-02 126
21-Dec-02 562
22-Dec-02 148
23-Dec-02 148
24-Dec-02 3
25-Dec-02 3
26-Dec-02 46
27-Dec-02 66
28-Dec-02 216
29-Dec-02 95
30-Dec-02 95
31-Dec-02 3
1-Jan-03 3
2-Jan-03 3
3-Jan-03 3
4-Jan-03 3
5-Jan-03 3
6-Jan-03 13
7-Jan-03 3
8-Jan-03 3
9-Jan-03 3
10-Jan-03 3
11-Jan-03 3
12-Jan-03 3
13-Jan-03 3
14-Jan-03 3
15-Jan-03 3
16-Jan-03 3
17-Jan-03 28
18-Jan-03 3
19-Jan-03 3
20-Jan-03 59
21-Jan-03 94
22-Jan-03 274
23-Jan-03 3
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 3
31-Jan-03 3
1-Feb-03 3
2-Feb-03 3
3-Feb-03 3
4-Feb-03 3
5-Feb-03 3
6-Feb-03 3
7-Feb-03 3
8-Feb-03 3
9-Feb-03 3
10-Feb-03 3
11-Feb-03 3
12-Feb-03 3
13-Feb-03 3
14-Feb-03 3
15-Feb-03 118
16-Feb-03 118
17-Feb-03 56
18-Feb-03 3
19-Feb-03 3
20-Feb-03 3
21-Feb-03 3
22-Feb-03 3
23-Feb-03 3
24-Feb-03 3
25-Feb-03 3
26-Feb-03 3
27-Feb-03 3
28-Feb-03 3
1-Mar-03 3
2-Mar-03 3
3-Mar-03 3
4-Mar-03 3
5-Mar-03 3
6-Mar-03 3
7-Mar-03 3
8-Mar-03 3
9-Mar-03 3
10-Mar-03 3
11-Mar-03 3
12-Mar-03 3
13-Mar-03 3
14-Mar-03 3
15-Mar-03 3
16-Mar-03 3
17-Mar-03 3
18-Mar-03 3
19-Mar-03 3
20-Mar-03 3
21-Mar-03 3
22-Mar-03 3
23-Mar-03 3
24-Mar-03 3
25-Mar-03 3
26-Mar-03 3
27-Mar-03 3
28-Mar-03 3
29-Mar-03 5
30-Mar-03 138
31-Mar-03 63
1-Apr-03 4
2-Apr-03 3
3-Apr-03 3
4-Apr-03 292
5-Apr-03 292
6-Apr-03 3
7-Apr-03 16
8-Apr-03 3
9-Apr-03 36
10-Apr-03 66
11-Apr-03 70
12-Apr-03 157
13-Apr-03 3
14-Apr-03 3
15-Apr-03 3
16-Apr-03 3
17-Apr-03 3
18-Apr-03 3
19-Apr-03 3
20-Apr-03 3
21-Apr-03 3
22-Apr-03 3
23-Apr-03 164
24-Apr-03 92
25-Apr-03 241
26-Apr-03 291
27-Apr-03 264
28-Apr-03 592
29-Apr-03 205