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: 8.60
Latest measurement: 11-Aug-11 Mean annual runoff: 27 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 33.7 mm
Latest M/C ratio: 1.35 Seven day total: 0.9 mm
Estimated current discharge: 164 m3/sec Percent of mean 7-day total: 147.7 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 535 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 520 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Dahlia Control Section (1491210)       Contributing Area:   sq mi 17554 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Preliminary  calibration to discharge has 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
5 2002 no data no data no data no data no data no data no data 0.7 0.7 0.9 1.0 1.8
17 2003 3.0 4.3 2.0 1.6 0.9 0.7 0.7 0.7 0.9 0.7 1.2 0.9
21 2004 2.8 2.9 3.9 4.0 1.2 0.6 0.7 0.7 0.6 0.7 1.9 1.4
21 2005 4.4 4.2 2.8 3.2 1.5 0.7 0.1 0.7 0.6 0.8 0.8 0.9
33 2006 3.5 4.0 5.2 5.2 4.1 4.3 2.4 1.7 1.1 1.1 0.0 0.0
14 2007 1.1 2.5 2.8 1.6 0.9 0.6 0.7 0.7 0.7 0.7 0.8 0.6
39 2008 1.1 4.2 5.5 5.2 4.3 3.3 3.2 4.0 2.5 2.8 1.2 1.7
42 2009 1.4 2.8 6.5 4.9 5.0 4.3 3.6 4.1 3.4 2.0 1.7 1.9
34 2010 2.4 1.8 4.5 5.3 4.4 3.5 3.1 2.3 2.2 1.1 0.7 2.4
Mean Annual Runoff (mm): 27 Standard Deviation: 10.6
Trend in Annual Runoff (slope):  30.4
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.
GoogleEarth View of Measurement Site
Return
Estimated
Disharge
Data
Date m3/sec
22-Jul-02 38
23-Jul-02 38
24-Jul-02 46
25-Jul-02 46
26-Jul-02 44
27-Jul-02 42
28-Jul-02 38
29-Jul-02 43
30-Jul-02 46
31-Jul-02 55
1-Aug-02 55
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 70
10-Aug-02 70
11-Aug-02 57
12-Aug-02 53
13-Aug-02 38
14-Aug-02 41
15-Aug-02 46
16-Aug-02 49
17-Aug-02 49
18-Aug-02 38
19-Aug-02 38
20-Aug-02 38
21-Aug-02 38
22-Aug-02 50
23-Aug-02 84
24-Aug-02 84
25-Aug-02 76
26-Aug-02 76
27-Aug-02 68
28-Aug-02 58
29-Aug-02 44
30-Aug-02 41
31-Aug-02 38
1-Sep-02 38
2-Sep-02 38
3-Sep-02 52
4-Sep-02 62
5-Sep-02 70
6-Sep-02 73
7-Sep-02 75
8-Sep-02 73
9-Sep-02 73
10-Sep-02 62
11-Sep-02 62
12-Sep-02 49
13-Sep-02 49
14-Sep-02 40
15-Sep-02 40
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02
22-Sep-02 57
23-Sep-02 57
24-Sep-02 56
25-Sep-02 56
26-Sep-02 44
27-Sep-02 44
28-Sep-02 38
29-Sep-02 38
30-Sep-02 38
1-Oct-02 38
2-Oct-02 38
3-Oct-02 85
4-Oct-02 85
5-Oct-02 76
6-Oct-02 53
7-Oct-02 38
8-Oct-02 38
9-Oct-02 38
10-Oct-02 38
11-Oct-02 38
12-Oct-02 49
13-Oct-02 49
14-Oct-02 48
15-Oct-02 51
16-Oct-02 38
17-Oct-02 38
18-Oct-02 41
19-Oct-02 38
20-Oct-02 38
21-Oct-02 58
22-Oct-02 47
23-Oct-02 43
24-Oct-02 47
25-Oct-02 43
26-Oct-02 52
27-Oct-02 52
28-Oct-02 88
29-Oct-02 88
30-Oct-02 98
31-Oct-02 76
1-Nov-02 46
2-Nov-02 41
3-Nov-02 38
4-Nov-02 38
5-Nov-02 38
6-Nov-02 38
7-Nov-02 38
8-Nov-02 45
9-Nov-02 38
10-Nov-02 38
11-Nov-02 38
12-Nov-02 38
13-Nov-02 38
14-Nov-02 38
15-Nov-02 38
16-Nov-02 80
17-Nov-02 129
18-Nov-02 107
19-Nov-02 146
20-Nov-02 55
21-Nov-02 55
22-Nov-02 38
23-Nov-02 38
24-Nov-02 38
25-Nov-02 38
26-Nov-02 38
27-Nov-02 42
28-Nov-02 42
29-Nov-02 150
30-Nov-02 150
1-Dec-02 155
2-Dec-02 195
3-Dec-02 190
4-Dec-02 171
5-Dec-02 225
6-Dec-02 149
7-Dec-02 149
8-Dec-02 135
9-Dec-02 107
10-Dec-02 76
11-Dec-02 83
12-Dec-02 69
13-Dec-02 54
14-Dec-02 54
15-Dec-02 61
16-Dec-02 61
17-Dec-02 64
18-Dec-02 58
19-Dec-02 38
20-Dec-02 56
21-Dec-02 69
22-Dec-02 38
23-Dec-02 38
24-Dec-02 57
25-Dec-02 82
26-Dec-02 176
27-Dec-02 141
28-Dec-02 119
29-Dec-02 93
30-Dec-02 93
31-Dec-02 83
1-Jan-03 83
2-Jan-03 38
3-Jan-03 101
4-Jan-03 126
5-Jan-03 97
6-Jan-03 138
7-Jan-03 113
8-Jan-03 113
9-Jan-03 212
10-Jan-03 242
11-Jan-03 273
12-Jan-03 218
13-Jan-03 209
14-Jan-03 132
15-Jan-03 132
16-Jan-03 151
17-Jan-03 151
18-Jan-03 138
19-Jan-03 114
20-Jan-03 79
21-Jan-03 185
22-Jan-03 223
23-Jan-03 267
24-Jan-03 267
25-Jan-03 190
26-Jan-03 210
27-Jan-03 245
28-Jan-03 221
29-Jan-03 212
30-Jan-03 153
31-Jan-03 153
1-Feb-03 160
2-Feb-03 160
3-Feb-03 180
4-Feb-03 192
5-Feb-03 190
6-Feb-03 253
7-Feb-03 293
8-Feb-03 359
9-Feb-03 359
10-Feb-03 238
11-Feb-03 256
12-Feb-03 210
13-Feb-03 204
14-Feb-03 250
15-Feb-03 274
16-Feb-03 274
17-Feb-03 438
18-Feb-03 438
19-Feb-03 413
20-Feb-03 392
21-Feb-03 302
22-Feb-03 301
23-Feb-03 315
24-Feb-03 262
25-Feb-03 262
26-Feb-03 215
27-Feb-03 184
28-Feb-03 171
1-Mar-03 145
2-Mar-03 83
3-Mar-03 81
4-Mar-03 81
5-Mar-03 256
6-Mar-03 256
7-Mar-03 268
8-Mar-03 226
9-Mar-03 104
10-Mar-03 137
11-Mar-03 149
12-Mar-03 145
13-Mar-03 145
14-Mar-03 123
15-Mar-03 104
16-Mar-03 117
17-Mar-03 74
18-Mar-03 38
19-Mar-03 38
20-Mar-03 38
21-Mar-03 51
22-Mar-03 51
23-Mar-03 38
24-Mar-03 60
25-Mar-03 63
26-Mar-03 78
27-Mar-03 110
28-Mar-03 124
29-Mar-03 124
30-Mar-03 109
31-Mar-03 103
1-Apr-03 81
2-Apr-03 76
3-Apr-03 85
4-Apr-03 117
5-Apr-03 117
6-Apr-03 76
7-Apr-03 76
8-Apr-03 38
9-Apr-03 39
10-Apr-03 45
11-Apr-03 52
12-Apr-03 62
13-Apr-03 58
14-Apr-03 58
15-Apr-03 38
16-Apr-03 67
17-Apr-03 82
18-Apr-03 128
19-Apr-03 180
20-Apr-03 203
21-Apr-03 203
22-Apr-03 148
23-Apr-03 148
24-Apr-03 131
25-Apr-03 114
26-Apr-03 95
27-Apr-03 82
28-Apr-03 60
29-Apr-03 67
30-Apr-03 67
1-May-03 56
2-May-03 54
3-May-03 43
4-May-03 57