Site ID: 1228 Lat. -30.4914 South Africa Northern Cape
River: Vis Long. 20.5062
Site name: Brandvlei Contributing area: 39593 km2 Ratio to Comparison Station: 1.40
Latest measurement: 10-Aug-11 Mean annual runoff: 103 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 220.3 mm
Latest M/C ratio: 1.15 Seven day total: 1.6 mm
Estimated current discharge: 177 m3/sec Percent of mean 7-day total: 51.7 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 502 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 494 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
14 2002 no data no data no data no data no data no data no data 0.3 1.7 3.8 2.7 5.0
37 2003 7.1 1.3 0.5 5.5 3.2 2.5 0.9 0.4 0.4 4.4 3.6 7.2
42 2004 6.1 3.2 4.0 2.3 1.7 1.5 1.1 2.2 2.5 5.0 5.3 7.0
83 2005 2.7 1.1 2.5 8.8 8.7 7.8 0.1 8.4 11.2 10.6 8.1 13.1
109 2006 10.9 15.0 16.1 9.0 12.7 10.3 10.6 7.4 9.8 6.9 0.0 0.0
109 2007 12.5 9.1 6.8 3.9 6.6 6.0 8.3 13.1 9.9 8.8 11.9 11.9
166 2008 10.9 15.9 17.4 12.0 8.2 13.7 16.6 15.2 13.0 12.4 14.1 16.2
177 2009 13.9 9.6 19.0 12.3 17.9 11.9 16.9 17.2 14.3 15.4 12.4 16.3
220 2010 14.4 13.7 25.8 19.4 17.7 17.1 15.7 14.4 13.7 16.4 16.2 35.7
Mean Annual Runoff (mm): 103 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 3
25-Jul-02 3
26-Jul-02 8
27-Jul-02 3
28-Jul-02 3
29-Jul-02 3
30-Jul-02 3
31-Jul-02 3
1-Aug-02 3
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 3
10-Aug-02 3
11-Aug-02 17
12-Aug-02 33
13-Aug-02 22
14-Aug-02 3
15-Aug-02 3
16-Aug-02 3
17-Aug-02 3
18-Aug-02 3
19-Aug-02 3
20-Aug-02 3
21-Aug-02 3
22-Aug-02 3
23-Aug-02 3
24-Aug-02 3
25-Aug-02 3
26-Aug-02 3
27-Aug-02 3
28-Aug-02 3
29-Aug-02 3
30-Aug-02 3
31-Aug-02 3
1-Sep-02 3
2-Sep-02 3
3-Sep-02 3
4-Sep-02 13
5-Sep-02 3
6-Sep-02 3
7-Sep-02 3
8-Sep-02 3
9-Sep-02 3
10-Sep-02 3
11-Sep-02 3
12-Sep-02 3
13-Sep-02 3
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 67
22-Sep-02 150
23-Sep-02 68
24-Sep-02 107
25-Sep-02 120
26-Sep-02 32
27-Sep-02 91
28-Sep-02 3
29-Sep-02 3
30-Sep-02 101
1-Oct-02 101
2-Oct-02 15
3-Oct-02 56
4-Oct-02 71
5-Oct-02 82
6-Oct-02 135
7-Oct-02 130
8-Oct-02 121
9-Oct-02 70
10-Oct-02 133
11-Oct-02 126
12-Oct-02 3
13-Oct-02 3
14-Oct-02 3
15-Oct-02 3
16-Oct-02 3
17-Oct-02 19
18-Oct-02 36
19-Oct-02 10
20-Oct-02 46
21-Oct-02 17
22-Oct-02 19
23-Oct-02 25
24-Oct-02 3
25-Oct-02 3
26-Oct-02 23
27-Oct-02 44
28-Oct-02 122
29-Oct-02 190
30-Oct-02 58
31-Oct-02 80
1-Nov-02 3
2-Nov-02 56
3-Nov-02 115
4-Nov-02 9
5-Nov-02 9
6-Nov-02 19
7-Nov-02 22
8-Nov-02 124
9-Nov-02 86
10-Nov-02 22
11-Nov-02 21
12-Nov-02 3
13-Nov-02 3
14-Nov-02 3
15-Nov-02 8
16-Nov-02 119
17-Nov-02 55
18-Nov-02 54
19-Nov-02 16
20-Nov-02 3
21-Nov-02 3
22-Nov-02 3
23-Nov-02 28
24-Nov-02 3
25-Nov-02 3
26-Nov-02 3
27-Nov-02 29
28-Nov-02 96
29-Nov-02 123
30-Nov-02 209
1-Dec-02 121
2-Dec-02 3
3-Dec-02 3
4-Dec-02 3
5-Dec-02 3
6-Dec-02 3
7-Dec-02 109
8-Dec-02 58
9-Dec-02 101
10-Dec-02 3
11-Dec-02 3
12-Dec-02 3
13-Dec-02 3
14-Dec-02 52
15-Dec-02 40
16-Dec-02 3
17-Dec-02 25
18-Dec-02 54
19-Dec-02 87
20-Dec-02 146
21-Dec-02 220
22-Dec-02 43
23-Dec-02 45
24-Dec-02 55
25-Dec-02 58
26-Dec-02 157
27-Dec-02 159
28-Dec-02 104
29-Dec-02 169
30-Dec-02 212
31-Dec-02 236
1-Jan-03 365
2-Jan-03 57
3-Jan-03 46
4-Jan-03 76
5-Jan-03 59
6-Jan-03 82
7-Jan-03 113
8-Jan-03 83
9-Jan-03 111
10-Jan-03 102
11-Jan-03 35
12-Jan-03 79
13-Jan-03 89
14-Jan-03 123
15-Jan-03 187
16-Jan-03 219
17-Jan-03 245
18-Jan-03 112
19-Jan-03 161
20-Jan-03 3
21-Jan-03 48
22-Jan-03 49
23-Jan-03 38
24-Jan-03 91
25-Jan-03 81
26-Jan-03 165
27-Jan-03 52
28-Jan-03 96
29-Jan-03 80
30-Jan-03 78
31-Jan-03 125
1-Feb-03 96
2-Feb-03 71
3-Feb-03 3
4-Feb-03 3
5-Feb-03 16
6-Feb-03 29
7-Feb-03 82
8-Feb-03 3
9-Feb-03 3
10-Feb-03 3
11-Feb-03 3
12-Feb-03 3
13-Feb-03 3
14-Feb-03 3
15-Feb-03 3
16-Feb-03 3
17-Feb-03 3
18-Feb-03 3
19-Feb-03 3
20-Feb-03 10
21-Feb-03 90
22-Feb-03 92
23-Feb-03 43
24-Feb-03 3
25-Feb-03 3
26-Feb-03 3
27-Feb-03 3
28-Feb-03 3
1-Mar-03 3
2-Mar-03 3
3-Mar-03 3
4-Mar-03 24
5-Mar-03 3
6-Mar-03 3
7-Mar-03 3
8-Mar-03 3
9-Mar-03 68
10-Mar-03 8
11-Mar-03 3
12-Mar-03 3
13-Mar-03 3
14-Mar-03 3
15-Mar-03 3
16-Mar-03 3