Site ID: 290 Lat. -19.6091 Botswana Ngamiland
River: Okavango Delta Long. 22.7837
Site name: Toteng Contributing area: 260932 km2 Ratio to Comparison Station: 0.49
Latest measurement: 3-Aug-10 Mean annual runoff: 98 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 132.2 mm
Latest M/C ratio: 1.60 Seven day total: 5.5 mm
Estimated current discharge: 2152 m3/sec Percent of mean 7-day total: 157.7 % (today's value compared to mean for same period, 2003-2009)
Ice-cover determination: 5 yr recurrence flood: 3815 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 3707 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
23 2002 no data no data no data no data no data no data no data 11.7 7.6 3.4 0.2 0.4
57 2003 0.3 0.0 0.0 0.9 2.7 14.2 16.0 13.4 6.8 1.9 0.4 0.1
115 2004 0.2 0.0 13.2 25.3 17.5 16.3 16.3 11.5 6.9 5.1 2.0 0.9
55 2005 0.2 0.0 0.0 0.0 10.5 19.6 1.8 13.3 5.9 3.2 0.3 0.3
110 2006 0.9 3.3 4.6 11.5 12.5 16.5 24.2 19.8 12.6 4.6 0.0 0.0
111 2007 0.0 0.0 3.2 19.4 25.3 21.9 17.7 12.4 6.5 1.3 2.1 0.6
90 2008 0.3 4.3 1.2 1.7 15.9 22.0 21.2 15.2 7.6 0.9 0.1 0.0
147 2009 0.1 0.3 4.6 20.2 34.5 29.1 22.9 16.7 9.5 6.5 1.9 1.2
132 2010 1.4 0.5 7.3 22.3 40.4 31.0 25.0 4.4 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 98 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 1488
23-Jul-02 1488
24-Jul-02 1430
25-Jul-02 1561
26-Jul-02 1523
27-Jul-02 1592
28-Jul-02 1474
29-Jul-02 1496
30-Jul-02 1477
31-Jul-02 1498
1-Aug-02 1575
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 1737
10-Aug-02 1737
11-Aug-02 1468
12-Aug-02 1376
13-Aug-02 1112
14-Aug-02 1279
15-Aug-02 1284
16-Aug-02 1405
17-Aug-02 1584
18-Aug-02 907
19-Aug-02 907
20-Aug-02 1294
21-Aug-02 1428
22-Aug-02 2044
23-Aug-02 2012
24-Aug-02 1800
25-Aug-02 1670
26-Aug-02 1775
27-Aug-02 1614
28-Aug-02 1440
29-Aug-02 1380
30-Aug-02 1269
31-Aug-02 1107
1-Sep-02 1203
2-Sep-02 1175
3-Sep-02 1342
4-Sep-02 1342
5-Sep-02 1270
6-Sep-02 1346
7-Sep-02 1241
8-Sep-02 1246
9-Sep-02 1222
10-Sep-02 1298
11-Sep-02 1442
12-Sep-02 1143
13-Sep-02 1143
14-Sep-02 740
15-Sep-02 740
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 542
22-Sep-02 650
23-Sep-02 501
24-Sep-02 506
25-Sep-02 505
26-Sep-02 479
27-Sep-02 505
28-Sep-02 539
29-Sep-02 529
30-Sep-02 243
1-Oct-02 243
2-Oct-02 243
3-Oct-02 394
4-Oct-02 454
5-Oct-02 565
6-Oct-02 565
7-Oct-02 584
8-Oct-02 574
9-Oct-02 351
10-Oct-02 497
11-Oct-02 533
12-Oct-02 459
13-Oct-02 626
14-Oct-02 425
15-Oct-02 405
16-Oct-02 215
17-Oct-02 294
18-Oct-02 226
19-Oct-02 309
20-Oct-02 444
21-Oct-02 261
22-Oct-02 261
23-Oct-02 168
24-Oct-02 254
25-Oct-02 263
26-Oct-02 288
27-Oct-02 325
28-Oct-02 71
29-Oct-02 105
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-02 152
7-Nov-02 152
8-Nov-02 168
9-Nov-02 37
10-Nov-02 3
11-Nov-02 3
12-Nov-02 3
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7-Dec-02 3
8-Dec-02 3
9-Dec-02 3
10-Dec-02 3
11-Dec-02 3
12-Dec-02 3
13-Dec-02 117
14-Dec-02 294
15-Dec-02 265
16-Dec-02 304
17-Dec-02 3
18-Dec-02 3
19-Dec-02 3
20-Dec-02 3
21-Dec-02 3
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27-Dec-02 3
28-Dec-02 3
29-Dec-02 3
30-Dec-02 3
31-Dec-02 3
1-Jan-03 3
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3-Jan-03 3
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19-Jan-03 3
20-Jan-03 3
21-Jan-03 203
22-Jan-03 319
23-Jan-03 76
24-Jan-03 104
25-Jan-03 3
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1-Mar-03 3
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1-Apr-03 3
2-Apr-03 3
3-Apr-03 3
4-Apr-03 526
5-Apr-03 526
6-Apr-03 544
7-Apr-03 1014
8-Apr-03 3
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