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Site ID: 1227 Lat. -30.8632 South Africa Northern Cape
River: Vis Long. 20.3882
Site name: Sakrivier Contributing area: 36117 km2 Ratio to Comparison Station: 1.28
Latest measurement: 29-Jul-10 Mean annual runoff: 121 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 99.7 mm
Latest M/C ratio: 1.12 Seven day total: 1.8 mm
Estimated current discharge: 56 m3/sec Percent of mean 7-day total: 68.6 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1060 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1006 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
15 2002 no data no data no data no data no data no data no data 1.5 1.0 3.7 3.0 5.9
48 2003 4.3 2.8 1.1 8.5 5.4 1.7 1.8 2.3 1.1 6.3 6.2 6.6
64 2004 5.4 5.1 10.1 6.0 3.0 2.8 1.0 2.3 3.1 3.8 11.9 9.9
88 2005 3.6 1.1 3.5 23.5 18.4 7.3 1.1 4.8 7.2 7.5 3.5 6.1
189 2006 13.9 30.3 17.1 22.8 33.1 16.0 12.5 18.7 20.5 4.3 0.0 0.0
105 2007 8.5 6.7 4.0 8.9 5.1 7.8 7.7 8.9 4.3 3.2 14.1 25.6
195 2008 22.2 22.2 30.3 13.6 16.2 17.0 25.5 13.4 10.2 6.0 8.6 10.1
159 2009 5.4 7.9 21.1 21.6 28.1 15.4 23.8 8.8 6.1 6.3 4.0 10.9
100 2010 14.0 14.3 36.8 11.5 7.8 9.6 5.6 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 121 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 4
23-Jul-02 4
24-Jul-02 3
25-Jul-02 3
26-Jul-02 3
27-Jul-02 3
28-Jul-02 3
29-Jul-02 3
30-Jul-02 3
31-Jul-02 3
1-Aug-02 40
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 75
10-Aug-02 75
11-Aug-02 56
12-Aug-02 16
13-Aug-02 3
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 9
25-Aug-02 71
26-Aug-02 107
27-Aug-02 77
28-Aug-02 65
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 3
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 45
22-Sep-02 39
23-Sep-02 3
24-Sep-02 3
25-Sep-02 3
26-Sep-02 3
27-Sep-02 29
28-Sep-02 29
29-Sep-02 52
30-Sep-02 167
1-Oct-02 167
2-Oct-02 40
3-Oct-02 3
4-Oct-02 3
5-Oct-02 28
6-Oct-02 77
7-Oct-02 162
8-Oct-02 118
9-Oct-02 37
10-Oct-02 105
11-Oct-02 89
12-Oct-02 3
13-Oct-02 3
14-Oct-02 3
15-Oct-02 3
16-Oct-02 3
17-Oct-02 3
18-Oct-02 3
19-Oct-02 3
20-Oct-02 3
21-Oct-02 3
22-Oct-02 66
23-Oct-02 109
24-Oct-02 82
25-Oct-02 47
26-Oct-02 51
27-Oct-02 36
28-Oct-02 65
29-Oct-02 93
30-Oct-02 83
31-Oct-02 48
1-Nov-02 3
2-Nov-02 42
3-Nov-02 126
4-Nov-02 16
5-Nov-02 16
6-Nov-02 3
7-Nov-02 3
8-Nov-02 44
9-Nov-02 41
10-Nov-02 16
11-Nov-02 17
12-Nov-02 3
13-Nov-02 29
14-Nov-02 114
15-Nov-02 145
16-Nov-02 201
17-Nov-02 49
18-Nov-02 67
19-Nov-02 59
20-Nov-02 39
21-Nov-02 54
22-Nov-02 6
23-Nov-02 3
24-Nov-02 3
25-Nov-02 3
26-Nov-02 3
27-Nov-02 3
28-Nov-02 30
29-Nov-02 17
30-Nov-02 74
1-Dec-02 4
2-Dec-02 3
3-Dec-02 3
4-Dec-02 20
5-Dec-02 7
6-Dec-02 3
7-Dec-02 3
8-Dec-02 3
9-Dec-02 30
10-Dec-02 3
11-Dec-02 3
12-Dec-02 3
13-Dec-02 84
14-Dec-02 178
15-Dec-02 226
16-Dec-02 315
17-Dec-02 62
18-Dec-02 134
19-Dec-02 170
20-Dec-02 205
21-Dec-02 242
22-Dec-02 15
23-Dec-02 3
24-Dec-02 3
25-Dec-02 3
26-Dec-02 142
27-Dec-02 82
28-Dec-02 80
29-Dec-02 112
30-Dec-02 120
31-Dec-02 200
1-Jan-03 208
2-Jan-03 55
3-Jan-03 41
4-Jan-03 14
5-Jan-03 20
6-Jan-03 49
7-Jan-03 67
8-Jan-03 85
9-Jan-03 54
10-Jan-03 8
11-Jan-03 3
12-Jan-03 3
13-Jan-03 14
14-Jan-03 35
15-Jan-03 53
16-Jan-03 93
17-Jan-03 123
18-Jan-03 81
19-Jan-03 125
20-Jan-03 44
21-Jan-03 70
22-Jan-03 51
23-Jan-03 19
24-Jan-03 15
25-Jan-03 81
26-Jan-03 174
27-Jan-03 135
28-Jan-03 61
29-Jan-03 10
30-Jan-03 3
31-Jan-03 9
1-Feb-03 55
2-Feb-03 3
3-Feb-03 3
4-Feb-03 3
5-Feb-03 3
6-Feb-03 3
7-Feb-03 47
8-Feb-03 8
9-Feb-03 3
10-Feb-03 3
11-Feb-03 3
12-Feb-03 3
13-Feb-03 3
14-Feb-03 21
15-Feb-03 3
16-Feb-03 3
17-Feb-03 3
18-Feb-03 3
19-Feb-03 50
20-Feb-03 156
21-Feb-03 220
22-Feb-03 203
23-Feb-03 165
24-Feb-03 88
25-Feb-03 86
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 3
5-Mar-03 23
6-Mar-03 61
7-Mar-03 90
8-Mar-03 3
9-Mar-03 42
10-Mar-03 3
11-Mar-03 3
12-Mar-03 3
13-Mar-03 3
14-Mar-03 3
15-Mar-03 3
16-Mar-03 3
17-Mar-03 23
18-Mar-03 24
19-Mar-03 3
20-Mar-03 3
21-Mar-03 3
22-Mar-03 3
23-Mar-03 3
24-Mar-03 3
25-Mar-03 3
26-Mar-03 3
27-Mar-03 3
28-Mar-03 3
29-Mar-03 3
30-Mar-03 23
31-Mar-03 76
1-Apr-03 132
2-Apr-03 198
3-Apr-03 210
4-Apr-03 225
5-Apr-03 225