Site ID: 289 Lat. -18.7634 Botswana Ngamiland
River: Okavango Long. 22.2615
Site name: Sepopa Contributing area: 254276 km2 Ratio to Comparison Station: 0.47
Latest measurement: 29-Jul-10 Mean annual runoff: 79 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 120.9 mm
Latest M/C ratio: 1.47 Seven day total: 3.5 mm
Estimated current discharge: 1515 m3/sec Percent of mean 7-day total: 392.3 % (today's value compared to mean for same period, 2003-2009)
Ice-cover determination: 5 yr recurrence flood: 4113 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 4080 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
3 2002 no data no data no data no data no data no data no data 1.2 0.9 0.2 0.0 0.8
39 2003 0.5 1.2 14.2 13.1 4.6 4.4 0.3 0.1 0.1 0.0 0.0 0.0
133 2004 1.4 30.9 32.1 21.8 16.6 11.0 7.2 3.4 2.0 2.7 3.4 0.3
63 2005 0.7 0.5 14.0 11.9 24.6 7.7 0.3 2.3 0.1 0.2 0.1 0.1
57 2006 1.6 5.8 3.9 7.6 13.9 13.8 4.6 2.8 1.7 0.9 0.0 0.0
80 2007 6.6 10.6 10.9 22.5 13.9 7.1 3.1 1.6 0.9 0.9 0.3 1.8
55 2008 0.3 3.6 6.6 14.2 13.5 7.4 3.7 2.8 1.5 0.5 0.1 0.8
126 2009 4.0 11.7 18.8 31.6 23.4 15.3 9.3 6.0 3.6 1.3 1.3 0.3
121 2010 2.3 17.6 12.4 27.0 30.2 17.2 13.7 0.5 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 79 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-02 422
23-Jul-02 422
24-Jul-02 335
25-Jul-02 255
26-Jul-02 143
27-Jul-02 200
28-Jul-02 196
29-Jul-02 189
30-Jul-02 217
31-Jul-02 166
1-Aug-02 170
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 299
10-Aug-02 299
11-Aug-02 97
12-Aug-02 137
13-Aug-02 20
14-Aug-02 3
15-Aug-02 35
16-Aug-02 58
17-Aug-02 121
18-Aug-02 201
19-Aug-02 201
20-Aug-02 76
21-Aug-02 81
22-Aug-02 36
23-Aug-02 163
24-Aug-02 249
25-Aug-02 304
26-Aug-02 198
27-Aug-02 129
28-Aug-02 148
29-Aug-02 114
30-Aug-02 199
31-Aug-02 210
1-Sep-02 226
2-Sep-02 354
3-Sep-02 204
4-Sep-02 204
5-Sep-02 27
6-Sep-02 121
7-Sep-02 112
8-Sep-02 102
9-Sep-02 201
10-Sep-02 243
11-Sep-02 278
12-Sep-02 131
13-Sep-02 131
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 3
22-Sep-02 3
23-Sep-02 4
24-Sep-02 3
25-Sep-02 82
26-Sep-02 3
27-Sep-02 3
28-Sep-02 3
29-Sep-02 3
30-Sep-02 129
1-Oct-02 129
2-Oct-02 129
3-Oct-02 3
4-Oct-02 3
5-Oct-02 3
6-Oct-02 3
7-Oct-02 59
8-Oct-02 4
9-Oct-02 46
10-Oct-02 3
11-Oct-02 3
12-Oct-02 3
13-Oct-02 3
14-Oct-02 3
15-Oct-02 3
16-Oct-02 3
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 3
8-Nov-02 3
9-Nov-02 3
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25-Nov-02 3
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28-Nov-02 3
29-Nov-02 3
30-Nov-02 3
1-Dec-02 3
2-Dec-02 3
3-Dec-02 3
4-Dec-02 3
5-Dec-02 3
6-Dec-02 3
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 3
14-Dec-02 3
15-Dec-02 3
16-Dec-02 3
17-Dec-02 3
18-Dec-02 3
19-Dec-02 3
20-Dec-02 3
21-Dec-02 3
22-Dec-02 3
23-Dec-02 3
24-Dec-02 3
25-Dec-02 3
26-Dec-02 3
27-Dec-02 3
28-Dec-02 3
29-Dec-02 305
30-Dec-02 608
31-Dec-02 1492
1-Jan-03 1472
2-Jan-03 3
3-Jan-03 3
4-Jan-03 3
5-Jan-03 3
6-Jan-03 3
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 3
18-Jan-03 3
19-Jan-03 3
20-Jan-03 3
21-Jan-03 3
22-Jan-03 3
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 64
3-Feb-03 3
4-Feb-03 37
5-Feb-03 3
6-Feb-03 3
7-Feb-03 3
8-Feb-03 3
9-Feb-03 54
10-Feb-03 66
11-Feb-03 66
12-Feb-03 136
13-Feb-03 130
14-Feb-03 136
15-Feb-03 103
16-Feb-03 35
17-Feb-03 38
18-Feb-03 68
19-Feb-03 247
20-Feb-03 290
21-Feb-03 341
22-Feb-03 361
23-Feb-03 360
24-Feb-03 347
25-Feb-03 379
26-Feb-03 150
27-Feb-03 150
28-Feb-03 56
1-Mar-03 379
2-Mar-03 444
3-Mar-03 561
4-Mar-03 705
5-Mar-03 549
6-Mar-03 760
7-Mar-03 604
8-Mar-03 1143
9-Mar-03 1179
10-Mar-03 1359
11-Mar-03 1359
12-Mar-03 1263
13-Mar-03 1574
14-Mar-03 1336
15-Mar-03 1336
16-Mar-03 1303
17-Mar-03 1278
18-Mar-03 1327
19-Mar-03 1309
20-Mar-03 1296
21-Mar-03 933
22-Mar-03 934
23-Mar-03 1133
24-Mar-03 1610
25-Mar-03 2096
26-Mar-03 2344
27-Mar-03 2714
28-Mar-03 2599
29-Mar-03 2338
30-Mar-03 1950
31-Mar-03 1950
1-Apr-03 1764
2-Apr-03 1823
3-Apr-03 2119
4-Apr-03 2187
5-Apr-03 2187
6-Apr-03 1739
7-Apr-03 1701
8-Apr-03 1087
9-Apr-03 1218
10-Apr-03 1176
11-Apr-03 1342
12-Apr-03 1604
13-Apr-03 1665
14-Apr-03 1763
15-Apr-03 1351
16-Apr-03 1351
17-Apr-03 1074