Site ID: 1273 Lat. -18.4262 Botswana Ngamiland
River: Okavango Long. 21.9388
Site name: Shakawe Contributing area: 245680 km2 Ratio to Comparison Station: 8.70
Latest measurement: 29-Jul-10 Mean annual runoff: 117 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 109.7 mm
Latest M/C ratio: 1.44 Seven day total: 3.5 mm
Estimated current discharge: 1531 m3/sec Percent of mean 7-day total: 183.7 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1849 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1844 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 5.7 4.1 2.7 2.5 4.2
84 2003 6.8 10.8 16.7 11.1 8.6 7.7 5.4 4.1 3.3 2.5 2.5 4.6
133 2004 14.0 17.8 17.2 15.7 15.2 12.2 10.3 8.1 7.0 5.7 4.9 5.4
111 2005 6.7 10.3 15.5 15.8 16.5 11.9 1.2 8.7 5.7 4.1 4.8 9.5
101 2006 8.1 8.9 10.2 15.9 16.2 11.9 9.1 8.3 6.2 5.7 0.0 0.0
129 2007 14.6 12.6 14.7 18.3 14.3 11.7 9.1 8.8 7.8 6.0 5.1 5.6
113 2008 6.1 10.8 11.5 14.8 14.3 10.2 10.8 8.9 7.6 5.9 4.6 7.8
147 2009 13.8 10.5 17.5 18.6 17.0 13.3 12.8 12.2 9.9 8.2 5.7 7.3
110 2010 12.6 14.8 15.5 17.6 18.0 15.9 15.0 0.4 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 117 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-02 902
23-Jul-02 902
24-Jul-02 819
25-Jul-02 716
26-Jul-02 673
27-Jul-02 744
28-Jul-02 718
29-Jul-02 763
30-Jul-02 812
31-Jul-02 774
1-Aug-02 897
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 614
10-Aug-02 614
11-Aug-02 499
12-Aug-02 597
13-Aug-02 575
14-Aug-02 571
15-Aug-02 631
16-Aug-02 586
17-Aug-02 606
18-Aug-02 833
19-Aug-02 833
20-Aug-02 881
21-Aug-02 881
22-Aug-02 760
23-Aug-02 745
24-Aug-02 779
25-Aug-02 672
26-Aug-02 601
27-Aug-02 569
28-Aug-02 647
29-Aug-02 604
30-Aug-02 592
31-Aug-02 596
1-Sep-02 567
2-Sep-02 639
3-Sep-02 569
4-Sep-02 569
5-Sep-02 461
6-Sep-02 522
7-Sep-02 589
8-Sep-02 607
9-Sep-02 651
10-Sep-02 624
11-Sep-02 676
12-Sep-02 488
13-Sep-02 488
14-Sep-02 336
15-Sep-02 336
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 352
22-Sep-02 394
23-Sep-02 475
24-Sep-02 412
25-Sep-02 413
26-Sep-02 224
27-Sep-02 235
28-Sep-02 151
29-Sep-02 327
30-Sep-02 577
1-Oct-02 577
2-Oct-02 577
3-Oct-02 231
4-Oct-02 151
5-Oct-02 151
6-Oct-02 151
7-Oct-02 278
8-Oct-02 369
9-Oct-02 414
10-Oct-02 401
11-Oct-02 484
12-Oct-02 313
13-Oct-02 243
14-Oct-02 151
15-Oct-02 198
16-Oct-02 236
17-Oct-02 182
18-Oct-02 196
19-Oct-02 207
20-Oct-02 179
21-Oct-02 174
22-Oct-02 174
23-Oct-02 151
24-Oct-02 151
25-Oct-02 151
26-Oct-02 151
27-Oct-02 151
28-Oct-02 175
29-Oct-02 174
30-Oct-02 252
31-Oct-02 237
1-Nov-02 276
2-Nov-02 151
3-Nov-02 151
4-Nov-02 151
5-Nov-02 151
6-Nov-02 295
7-Nov-02 295
8-Nov-02 341
9-Nov-02 308
10-Nov-02 214
11-Nov-02 209
12-Nov-02 185
13-Nov-02 151
14-Nov-02 233
15-Nov-02 362
16-Nov-02 307
17-Nov-02 282
18-Nov-02 285
19-Nov-02 221
20-Nov-02 202
21-Nov-02 217
22-Nov-02 195
23-Nov-02 195
24-Nov-02 151
25-Nov-02 151
26-Nov-02 151
27-Nov-02 196
28-Nov-02 378
29-Nov-02 488
30-Nov-02 296
1-Dec-02 247
2-Dec-02 306
3-Dec-02 314
4-Dec-02 331
5-Dec-02 331
6-Dec-02 352
7-Dec-02 398
8-Dec-02 370
9-Dec-02 370
10-Dec-02 371
11-Dec-02 406
12-Dec-02 423
13-Dec-02 470
14-Dec-02 497
15-Dec-02 523
16-Dec-02 535
17-Dec-02 390
18-Dec-02 370
19-Dec-02 282
20-Dec-02 235
21-Dec-02 237
22-Dec-02 201
23-Dec-02 155
24-Dec-02 220
25-Dec-02 220
26-Dec-02 229
27-Dec-02 310
28-Dec-02 309
29-Dec-02 591
30-Dec-02 764
31-Dec-02 1088
1-Jan-03 959
2-Jan-03 613
3-Jan-03 679
4-Jan-03 637
5-Jan-03 602
6-Jan-03 598
7-Jan-03 564
8-Jan-03 572
9-Jan-03 514
10-Jan-03 514
11-Jan-03 476
12-Jan-03 549
13-Jan-03 638
14-Jan-03 630
15-Jan-03 660
16-Jan-03 632
17-Jan-03 618
18-Jan-03 641
19-Jan-03 670
20-Jan-03 690
21-Jan-03 687
22-Jan-03 713
23-Jan-03 692
24-Jan-03 671
25-Jan-03 639
26-Jan-03 639
27-Jan-03 468
28-Jan-03 512
29-Jan-03 491
30-Jan-03 625
31-Jan-03 766
1-Feb-03 859
2-Feb-03 934
3-Feb-03 918
4-Feb-03 944
5-Feb-03 863
6-Feb-03 898
7-Feb-03 891
8-Feb-03 921
9-Feb-03 1026
10-Feb-03 848
11-Feb-03 848
12-Feb-03 829
13-Feb-03 861
14-Feb-03 985
15-Feb-03 1050
16-Feb-03 1077
17-Feb-03 1144
18-Feb-03 1102
19-Feb-03 1078
20-Feb-03 1266
21-Feb-03 1218
22-Feb-03 1363
23-Feb-03 1443
24-Feb-03 1412
25-Feb-03 1596
26-Feb-03 1424
27-Feb-03 1424
28-Feb-03 1399
1-Mar-03 1478
2-Mar-03 1560
3-Mar-03 1526
4-Mar-03 1566
5-Mar-03 1470
6-Mar-03 1436
7-Mar-03 1420
8-Mar-03 1604
9-Mar-03 1577
10-Mar-03 1629
11-Mar-03 1629
12-Mar-03 1553
13-Mar-03 1636
14-Mar-03 1583
15-Mar-03 1583
16-Mar-03 1541
17-Mar-03 1583
18-Mar-03 1575
19-Mar-03 1626
20-Mar-03 1702
21-Mar-03 1759
22-Mar-03 1750
23-Mar-03 1361
24-Mar-03 1517
25-Mar-03 1470
26-Mar-03 1508
27-Mar-03 1550
28-Mar-03 1449