Site ID: 1223 Lat. -32.6691 South Africa Western Cape
River: Sout Long. 22.9318
Site name: Rietbron Contributing area: 1516 km2 Ratio to Comparison Station: 0.05
Latest measurement: 29-Jul-10 Mean annual runoff: 450 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 489.2 mm
Latest M/C ratio: 1.10 Seven day total: 1.3 mm
Estimated current discharge: 3 m3/sec Percent of mean 7-day total: 13.1 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 795 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 747 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
337 2002 no data no data no data no data no data no data no data 157.3 4.7 5.9 21.9 147.2
161 2003 24.6 56.3 5.9 5.7 28.9 5.7 5.9 5.9 5.7 6.0 4.7 5.9
210 2004 5.9 11.0 11.0 18.3 5.9 27.5 15.7 5.9 26.3 7.7 22.8 52.6
713 2005 17.7 223.5 130.6 152.5 62.6 5.7 0.6 5.9 5.7 5.9 83.4 19.2
370 2006 90.2 14.8 5.9 14.9 45.7 11.5 85.0 89.4 5.7 6.6 0.0 0.0
368 2007 5.9 19.0 72.8 34.6 11.9 5.7 9.9 5.9 5.7 31.0 106.2 59.7
390 2008 32.8 5.5 82.1 5.7 35.2 108.9 18.3 75.8 5.7 7.9 6.0 5.9
937 2009 175.7 99.7 23.8 220.9 25.4 21.7 5.9 7.8 5.7 149.1 92.0 109.1
489 2010 6.9 419.8 36.7 5.7 5.7 5.7 8.6 0.2 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 450 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 3
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 3
12-Aug-02 3
13-Aug-02 3
14-Aug-02 3
15-Aug-02 3
16-Aug-02 3
17-Aug-02 52
18-Aug-02 324
19-Aug-02 590
20-Aug-02 409
21-Aug-02 619
22-Aug-02 250
23-Aug-02 225
24-Aug-02 103
25-Aug-02 69
26-Aug-02 74
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 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 3
22-Sep-02 3
23-Sep-02 3
24-Sep-02 3
25-Sep-02 3
26-Sep-02 3
27-Sep-02 3
28-Sep-02 3
29-Sep-02 3
30-Sep-02 3
1-Oct-02 3
2-Oct-02 3
3-Oct-02 3
4-Oct-02 3
5-Oct-02 3
6-Oct-02 3
7-Oct-02 3
8-Oct-02 3
9-Oct-02 3
10-Oct-02 3
11-Oct-02 3
12-Oct-02 3
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14-Oct-02 3
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17-Oct-02 3
18-Oct-02 3
19-Oct-02 3
20-Oct-02 3
21-Oct-02 3
22-Oct-02 3
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24-Oct-02 3
25-Oct-02 3
26-Oct-02 3
27-Oct-02 3
28-Oct-02 3
29-Oct-02 3
30-Oct-02 3
31-Oct-02 3
1-Nov-02 3
2-Nov-02 3
3-Nov-02 284
4-Nov-02 8
5-Nov-02 3
6-Nov-02 3
7-Nov-02 3
8-Nov-02 3
9-Nov-02 3
10-Nov-02 3
11-Nov-02 3
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1-Dec-02 3
2-Dec-02 3
3-Dec-02 3
4-Dec-02 3
5-Dec-02 3
6-Dec-02 3
7-Dec-02 3
8-Dec-02 3
9-Dec-02 3
10-Dec-02 3
11-Dec-02 3
12-Dec-02 340
13-Dec-02 282
14-Dec-02 339
15-Dec-02 169
16-Dec-02 3
17-Dec-02 3
18-Dec-02 3
19-Dec-02 3
20-Dec-02 3
21-Dec-02 3
22-Dec-02 13
23-Dec-02 208
24-Dec-02 375
25-Dec-02 574
26-Dec-02 190
27-Dec-02 22
28-Dec-02 3
29-Dec-02 3
30-Dec-02 3
31-Dec-02 3
1-Jan-03 3
2-Jan-03 3
3-Jan-03 3
4-Jan-03 3
5-Jan-03 3
6-Jan-03 3
7-Jan-03 3
8-Jan-03 3
9-Jan-03 48
10-Jan-03 151
11-Jan-03 140
12-Jan-03 3
13-Jan-03 3
14-Jan-03 3
15-Jan-03 3
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17-Jan-03 3
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19-Feb-03 21
20-Feb-03 237
21-Feb-03 439
22-Feb-03 212
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1-Mar-03 3
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12-May-03 53
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14-May-03 9
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27-May-03 181
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