Site ID: 1272 Lat. -19.1153 Botswana Ngamiland
River: Okavango Delta Long. 23.0837
Site name: Phologelo Contributing area: 257785 km2 Ratio to Comparison Station: 9.13
Latest measurement: 29-Jul-10 Mean annual runoff: 45 mm (2003-2009)
Hydrologic status: 3 Flood Total runoff this year (2010): 62.9 mm
Latest M/C ratio: 1.40 Seven day total: 2.7 mm
Estimated current discharge: 1195 m3/sec Percent of mean 7-day total: 179.9 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1640 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1612 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
19 2002 no data no data no data no data no data no data no data 6.1 4.6 3.3 2.2 2.4
23 2003 3.0 2.6 3.0 2.5 2.3 1.3 1.3 2.2 2.3 0.8 0.7 1.2
34 2004 2.6 1.2 2.9 4.0 4.3 4.6 4.7 3.1 1.1 1.1 1.6 2.8
29 2005 1.7 1.8 2.2 3.5 2.1 0.8 0.3 7.5 3.3 1.2 2.1 2.2
53 2006 7.0 7.2 8.5 4.7 3.0 3.1 4.9 6.6 4.2 4.2 0.0 0.0
49 2007 1.9 1.3 2.4 4.0 4.6 10.4 10.6 7.3 3.1 1.4 0.6 0.9
47 2008 1.9 10.0 4.9 2.9 2.3 3.5 6.0 5.7 2.9 2.0 1.2 3.4
77 2009 3.0 1.9 5.4 4.8 13.1 15.5 13.5 8.1 3.1 3.4 2.9 2.7
63 2010 3.1 2.5 8.1 9.5 12.2 15.0 12.1 0.4 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 45 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-02 796
23-Jul-02 796
24-Jul-02 680
25-Jul-02 897
26-Jul-02 632
27-Jul-02 632
28-Jul-02 660
29-Jul-02 691
30-Jul-02 792
31-Jul-02 792
1-Aug-02 757
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 1085
10-Aug-02 1085
11-Aug-02 648
12-Aug-02 648
13-Aug-02 532
14-Aug-02 668
15-Aug-02 889
16-Aug-02 983
17-Aug-02 1068
18-Aug-02 814
19-Aug-02 814
20-Aug-02 543
21-Aug-02 796
22-Aug-02 896
23-Aug-02 884
24-Aug-02 962
25-Aug-02 777
26-Aug-02 801
27-Aug-02 641
28-Aug-02 641
29-Aug-02 362
30-Aug-02 495
31-Aug-02 477
1-Sep-02 606
2-Sep-02 817
3-Sep-02 682
4-Sep-02 682
5-Sep-02 475
6-Sep-02 556
7-Sep-02 490
8-Sep-02 529
9-Sep-02 558
10-Sep-02 640
11-Sep-02 814
12-Sep-02 651
13-Sep-02 651
14-Sep-02 365
15-Sep-02 365
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 512
22-Sep-02 513
23-Sep-02 442
24-Sep-02 483
25-Sep-02 473
26-Sep-02 473
27-Sep-02 564
28-Sep-02 515
29-Sep-02 515
30-Sep-02 467
1-Oct-02 467
2-Oct-02 467
3-Oct-02 302
4-Oct-02 159
5-Oct-02 199
6-Oct-02 199
7-Oct-02 281
8-Oct-02 378
9-Oct-02 296
10-Oct-02 299
11-Oct-02 290
12-Oct-02 290
13-Oct-02 438
14-Oct-02 562
15-Oct-02 562
16-Oct-02 381
17-Oct-02 446
18-Oct-02 392
19-Oct-02 324
20-Oct-02 381
21-Oct-02 234
22-Oct-02 234
23-Oct-02 293
24-Oct-02 308
25-Oct-02 284
26-Oct-02 312
27-Oct-02 314
28-Oct-02 327
29-Oct-02 389
30-Oct-02 70
31-Oct-02 70
1-Nov-02 3
2-Nov-02 22
3-Nov-02 274
4-Nov-02 326
5-Nov-02 326
6-Nov-02 161
7-Nov-02 161
8-Nov-02 94
9-Nov-02 213
10-Nov-02 340
11-Nov-02 351
12-Nov-02 393
13-Nov-02 342
14-Nov-02 355
15-Nov-02 214
16-Nov-02 214
17-Nov-02 94
18-Nov-02 206
19-Nov-02 257
20-Nov-02 285
21-Nov-02 388
22-Nov-02 314
23-Nov-02 314
24-Nov-02 260
25-Nov-02 264
26-Nov-02 228
27-Nov-02 123
28-Nov-02 91
29-Nov-02 3
30-Nov-02 3
1-Dec-02 3
2-Dec-02 3
3-Dec-02 392
4-Dec-02 464
5-Dec-02 464
6-Dec-02 282
7-Dec-02 232
8-Dec-02 3
9-Dec-02 3
10-Dec-02 137
11-Dec-02 158
12-Dec-02 232
13-Dec-02 178
14-Dec-02 141
15-Dec-02 165
16-Dec-02 147
17-Dec-02 186
18-Dec-02 186
19-Dec-02 226
20-Dec-02 238
21-Dec-02 310
22-Dec-02 363
23-Dec-02 364
24-Dec-02 330
25-Dec-02 330
26-Dec-02 329
27-Dec-02 350
28-Dec-02 332
29-Dec-02 245
30-Dec-02 177
31-Dec-02 80
1-Jan-03 3
2-Jan-03 126
3-Jan-03 126
4-Jan-03 313
5-Jan-03 354
6-Jan-03 468
7-Jan-03 388
8-Jan-03 331
9-Jan-03 235
10-Jan-03 235
11-Jan-03 254
12-Jan-03 388
13-Jan-03 486
14-Jan-03 492
15-Jan-03 568
16-Jan-03 513
17-Jan-03 507
18-Jan-03 193
19-Jan-03 193
20-Jan-03 248
21-Jan-03 233
22-Jan-03 413
23-Jan-03 408
24-Jan-03 300
25-Jan-03 298
26-Jan-03 298
27-Jan-03 119
28-Jan-03 99
29-Jan-03 78
30-Jan-03 135
31-Jan-03 165
1-Feb-03 220
2-Feb-03 322
3-Feb-03 398
4-Feb-03 398
5-Feb-03 253
6-Feb-03 326
7-Feb-03 290
8-Feb-03 294
9-Feb-03 386
10-Feb-03 257
11-Feb-03 257
12-Feb-03 140
13-Feb-03 261
14-Feb-03 295
15-Feb-03 318
16-Feb-03 406
17-Feb-03 166
18-Feb-03 99
19-Feb-03 3
20-Feb-03 3
21-Feb-03 239
22-Feb-03 263
23-Feb-03 312
24-Feb-03 318
25-Feb-03 320
26-Feb-03 440
27-Feb-03 440
28-Feb-03 289
1-Mar-03 178
2-Mar-03 54
3-Mar-03 75
4-Mar-03 87
5-Mar-03 197
6-Mar-03 218
7-Mar-03 306
8-Mar-03 306
9-Mar-03 246
10-Mar-03 317
11-Mar-03 317
12-Mar-03 343
13-Mar-03 390
14-Mar-03 261
15-Mar-03 261
16-Mar-03 90
17-Mar-03 169
18-Mar-03 225
19-Mar-03 290
20-Mar-03 375
21-Mar-03 443
22-Mar-03 577
23-Mar-03 262
24-Mar-03 262
25-Mar-03 239
26-Mar-03 426
27-Mar-03 691
28-Mar-03 414
29-Mar-03 266
30-Mar-03 286
31-Mar-03 286
1-Apr-03 393
2-Apr-03 237
3-Apr-03 175
4-Apr-03 207
5-Apr-03 207