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Site ID: 1240 Lat. -18.6026 Namibia Owambo
River: Lake Opono Long. 16.0991
Site name: Owambo Contributing area: 151048 km2 Ratio to Comparison Station: 5.35
Latest measurement: 31-Jul-10 Mean annual runoff: 159 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 171.7 mm
Latest M/C ratio: 1.40 Seven day total: 4.3 mm
Estimated current discharge: 1202 m3/sec Percent of mean 7-day total: 180.4 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 4881 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 4704 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
16 2002 no data no data no data no data no data no data no data 1.6 1.5 1.9 2.6 8.7
78 2003 18.4 31.8 10.5 7.2 1.4 0.2 0.1 0.2 1.6 0.1 4.6 1.4
113 2004 16.8 19.6 27.4 28.6 3.6 0.1 0.1 0.1 0.1 0.3 10.3 5.5
113 2005 33.8 30.9 16.8 21.2 6.0 0.4 0.0 0.1 0.1 0.6 1.0 1.9
219 2006 23.0 29.0 39.6 39.3 28.8 31.3 13.4 7.6 3.8 3.6 0.0 0.0
45 2007 3.1 15.2 17.0 6.8 1.4 0.1 0.1 0.1 0.1 0.2 1.0 0.1
261 2008 3.0 30.2 41.9 39.3 31.0 22.0 20.9 28.0 14.6 17.2 4.5 8.1
285 2009 5.2 17.4 52.9 36.7 37.5 31.5 24.5 29.0 22.4 10.5 8.0 9.5
172 2010 13.5 9.0 31.6 40.8 32.1 23.8 19.7 1.1 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 159 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 3
23-Jul-02 3
24-Jul-02 52
25-Jul-02 52
26-Jul-02 36
27-Jul-02 23
28-Jul-02 3
29-Jul-02 29
30-Jul-02 51
31-Jul-02 119
1-Aug-02 119
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 228
10-Aug-02 228
11-Aug-02 133
12-Aug-02 105
13-Aug-02 3
14-Aug-02 19
15-Aug-02 53
16-Aug-02 77
17-Aug-02 77
18-Aug-02 3
19-Aug-02 3
20-Aug-02 3
21-Aug-02 3
22-Aug-02 80
23-Aug-02 342
24-Aug-02 342
25-Aug-02 276
26-Aug-02 276
27-Aug-02 216
28-Aug-02 144
29-Aug-02 37
30-Aug-02 19
31-Aug-02 3
1-Sep-02 3
2-Sep-02 3
3-Sep-02 95
4-Sep-02 172
5-Sep-02 235
6-Sep-02 250
7-Sep-02 268
8-Sep-02 250
9-Sep-02 250
10-Sep-02 173
11-Sep-02 173
12-Sep-02 75
13-Sep-02 75
14-Sep-02 11
15-Sep-02 11
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02
22-Sep-02 132
23-Sep-02 132
24-Sep-02 126
25-Sep-02 126
26-Sep-02 34
27-Sep-02 34
28-Sep-02 3
29-Sep-02 3
30-Sep-02 3
1-Oct-02 3
2-Oct-02 3
3-Oct-02 350
4-Oct-02 350
5-Oct-02 281
6-Oct-02 101
7-Oct-02 3
8-Oct-02 3
9-Oct-02 3
10-Oct-02 3
11-Oct-02 3
12-Oct-02 72
13-Oct-02 72
14-Oct-02 67
15-Oct-02 88
16-Oct-02 3
17-Oct-02 3
18-Oct-02 15
19-Oct-02 3
20-Oct-02 3
21-Oct-02 137
22-Oct-02 59
23-Oct-02 29
24-Oct-02 61
25-Oct-02 30
26-Oct-02 97
27-Oct-02 97
28-Oct-02 366
29-Oct-02 366
30-Oct-02 450
31-Oct-02 275
1-Nov-02 50
2-Nov-02 18
3-Nov-02 3
4-Nov-02 3
5-Nov-02 3
6-Nov-02 3
7-Nov-02 3
8-Nov-02 48
9-Nov-02 3
10-Nov-02 3
11-Nov-02 3
12-Nov-02 3
13-Nov-02 3
14-Nov-02 3
15-Nov-02 3
16-Nov-02 305
17-Nov-02 698
18-Nov-02 518
19-Nov-02 837
20-Nov-02 117
21-Nov-02 117
22-Nov-02 3
23-Nov-02 3
24-Nov-02 3
25-Nov-02 3
26-Nov-02 3
27-Nov-02 24
28-Nov-02 24
29-Nov-02 870
30-Nov-02 870
1-Dec-02 911
2-Dec-02 1258
3-Dec-02 1220
4-Dec-02 1053
5-Dec-02 1532
6-Dec-02 867
7-Dec-02 867
8-Dec-02 746
9-Dec-02 521
10-Dec-02 278
11-Dec-02 330
12-Dec-02 221
13-Dec-02 113
14-Dec-02 113
15-Dec-02 161
16-Dec-02 161
17-Dec-02 184
18-Dec-02 143
19-Dec-02 3
20-Dec-02 127
21-Dec-02 223
22-Dec-02 3
23-Dec-02 3
24-Dec-02 135
25-Dec-02 325
26-Dec-02 1099
27-Dec-02 799
28-Dec-02 619
29-Dec-02 410
30-Dec-02 410
31-Dec-02 331
1-Jan-03 331
2-Jan-03 3
3-Jan-03 468
4-Jan-03 675
5-Jan-03 441
6-Jan-03 771
7-Jan-03 565
8-Jan-03 565
9-Jan-03 1412
10-Jan-03 1693
11-Jan-03 1986
12-Jan-03 1465
13-Jan-03 1389
14-Jan-03 725
15-Jan-03 725
16-Jan-03 881
17-Jan-03 881
18-Jan-03 772
19-Jan-03 578
20-Jan-03 297
21-Jan-03 1176
22-Jan-03 1512
23-Jan-03 1929
24-Jan-03 1929
25-Jan-03 1216
26-Jan-03 1399
27-Jan-03 1715
28-Jan-03 1495
29-Jan-03 1419
30-Jan-03 893
31-Jan-03 893
1-Feb-03 959
2-Feb-03 959
3-Feb-03 1126
4-Feb-03 1231
5-Feb-03 1219
6-Feb-03 1798
7-Feb-03 2180
8-Feb-03 2858
9-Feb-03 2858
10-Feb-03 1658
11-Feb-03 1822
12-Feb-03 1397
13-Feb-03 1345
14-Feb-03 1769
15-Feb-03 2002
16-Feb-03 2002
17-Feb-03 3732
18-Feb-03 3732
19-Feb-03 3448
20-Feb-03 3216
21-Feb-03 2277
22-Feb-03 2261
23-Feb-03 2403
24-Feb-03 1882
25-Feb-03 1882
26-Feb-03 1438
27-Feb-03 1167
28-Feb-03 1049
1-Mar-03 833
2-Mar-03 331
3-Mar-03 312
4-Mar-03 312
5-Mar-03 1822
6-Mar-03 1822
7-Mar-03 1943
8-Mar-03 1540
9-Mar-03 498
10-Mar-03 766
11-Mar-03 863
12-Mar-03 826
13-Mar-03 826
14-Mar-03 646
15-Mar-03 498
16-Mar-03 603
17-Mar-03 260
18-Mar-03 3
19-Mar-03 3
20-Mar-03 3
21-Mar-03 89
22-Mar-03 89
23-Mar-03 3
24-Mar-03 154
25-Mar-03 175
26-Mar-03 295
27-Mar-03 541
28-Mar-03 657
29-Mar-03 657
30-Mar-03 534
31-Mar-03 487
1-Apr-03 316
2-Apr-03 278
3-Apr-03 349
4-Apr-03 603
5-Apr-03 603
6-Apr-03 275
7-Apr-03 275
8-Apr-03 3
9-Apr-03 3
10-Apr-03 44
11-Apr-03 98
12-Apr-03 171
13-Apr-03 141
14-Apr-03 141
15-Apr-03 3
16-Apr-03 211
17-Apr-03 327
18-Apr-03 693
19-Apr-03 1130
20-Apr-03 1337
21-Apr-03 1337
22-Apr-03 857
23-Apr-03 857
24-Apr-03 717
25-Apr-03 577
26-Apr-03 427
27-Apr-03 326
28-Apr-03 152
29-Apr-03 210
30-Apr-03 210
1-May-03 125
2-May-03 112
3-May-03 28