Site ID: 1232 Lat. -30.5135 South Africa Free State
River: Orange Long. 26.0818
Site name: Bethulie Contributing area: 64949 km2 Ratio to Comparison Station: 2.30
Latest measurement: 30-Jul-10 Mean annual runoff: 100 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 167.4 mm
Latest M/C ratio: 1.10 Seven day total: 3.2 mm
Estimated current discharge: 407 m3/sec Percent of mean 7-day total: 172.0 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1690 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1524 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
26 2002 no data no data no data no data no data no data no data 1.8 8.0 8.1 4.1 3.8
45 2003 9.2 4.0 6.4 6.9 4.4 3.5 0.3 0.8 0.9 0.4 1.7 6.1
0 2004 7.7 3.0 -0.7 -1.4 -1.2 -1.4 -1.3 -1.4 -1.2 -1.2 -0.6 0.1
55 2005 0.2 -0.1 1.2 0.4 0.7 -0.5 -0.2 -1.0 -0.8 -0.9 35.2 21.1
166 2006 0.3 23.5 34.9 28.2 12.3 12.7 12.7 8.5 17.6 15.5 0.0 0.0
71 2007 7.6 7.6 12.0 1.9 4.7 4.1 5.5 2.1 5.3 1.5 9.2 9.7
85 2008 8.9 9.1 15.9 11.0 6.2 5.2 5.7 3.8 3.9 5.4 4.0 6.0
280 2009 10.7 17.6 33.6 31.8 21.2 13.1 17.4 17.0 18.5 28.8 37.3 32.6
167 2010 28.2 27.0 30.3 30.9 21.6 16.1 12.3 1.1 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 100 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 90
23-Jul-02 90
24-Jul-02 149
25-Jul-02 132
26-Jul-02 136
27-Jul-02 168
28-Jul-02 169
29-Jul-02 218
30-Jul-02 300
31-Jul-02 300
1-Aug-02
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 16
10-Aug-02 106
11-Aug-02 83
12-Aug-02 83
13-Aug-02 81
14-Aug-02 26
15-Aug-02 125
16-Aug-02 136
17-Aug-02 165
18-Aug-02 122
19-Aug-02 78
20-Aug-02 28
21-Aug-02 10
22-Aug-02 11
23-Aug-02 11
24-Aug-02 84
25-Aug-02 78
26-Aug-02 22
27-Aug-02 42
28-Aug-02 11
29-Aug-02 -4
30-Aug-02 58
31-Aug-02 5
1-Sep-02 158
2-Sep-02 114
3-Sep-02 138
4-Sep-02 204
5-Sep-02 108
6-Sep-02 253
7-Sep-02 71
8-Sep-02 71
9-Sep-02 -35
10-Sep-02 -35
11-Sep-02 -35
12-Sep-02 -35
13-Sep-02 -24
14-Sep-02 0
15-Sep-02 476
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 646
22-Sep-02 646
23-Sep-02 737
24-Sep-02 737
25-Sep-02 501
26-Sep-02 429
27-Sep-02 226
28-Sep-02 226
29-Sep-02 222
30-Sep-02 251
1-Oct-02 376
2-Oct-02 403
3-Oct-02 526
4-Oct-02 369
5-Oct-02 385
6-Oct-02 370
7-Oct-02 121
8-Oct-02 162
9-Oct-02 263
10-Oct-02 263
11-Oct-02 357
12-Oct-02 355
13-Oct-02 199
14-Oct-02 139
15-Oct-02 162
16-Oct-02 54
17-Oct-02 -2
18-Oct-02 -34
19-Oct-02 65
20-Oct-02 117
21-Oct-02 125
22-Oct-02 223
23-Oct-02 60
24-Oct-02 28
25-Oct-02 109
26-Oct-02 109
27-Oct-02 308
28-Oct-02 208
29-Oct-02 78
30-Oct-02 128
31-Oct-02 95
1-Nov-02 118
2-Nov-02 309
3-Nov-02 20
4-Nov-02 117
5-Nov-02 117
6-Nov-02 159
7-Nov-02 213
8-Nov-02 225
9-Nov-02 288
10-Nov-02 221
11-Nov-02 221
12-Nov-02 63
13-Nov-02 43
14-Nov-02 -35
15-Nov-02 -15
16-Nov-02 -14
17-Nov-02 38
18-Nov-02 256
19-Nov-02 192
20-Nov-02 21
21-Nov-02 -23
22-Nov-02 9
23-Nov-02 -18
24-Nov-02 40
25-Nov-02 50
26-Nov-02 51
27-Nov-02 51
28-Nov-02 135
29-Nov-02 141
30-Nov-02 62
1-Dec-02 62
2-Dec-02 43
3-Dec-02 -35
4-Dec-02 -35
5-Dec-02 -35
6-Dec-02 -1
7-Dec-02 31
8-Dec-02 66
9-Dec-02 142
10-Dec-02 67
11-Dec-02 118
12-Dec-02 14
13-Dec-02 14
14-Dec-02 -30
15-Dec-02 7
16-Dec-02 31
17-Dec-02 70
18-Dec-02 138
19-Dec-02 206
20-Dec-02 297
21-Dec-02 219
22-Dec-02 197
23-Dec-02 90
24-Dec-02 104
25-Dec-02 103
26-Dec-02 140
27-Dec-02 222
28-Dec-02 199
29-Dec-02 199
30-Dec-02 91
31-Dec-02 91
1-Jan-03 69
2-Jan-03 651
3-Jan-03 1610
4-Jan-03 519
5-Jan-03 519
6-Jan-03 14
7-Jan-03 137
8-Jan-03 199
9-Jan-03 173
10-Jan-03 217
11-Jan-03 139
12-Jan-03 158
13-Jan-03 187
14-Jan-03 187
15-Jan-03 177
16-Jan-03 211
17-Jan-03 154
18-Jan-03 170
19-Jan-03 162
20-Jan-03 77
21-Jan-03 108
22-Jan-03 131
23-Jan-03 156
24-Jan-03 50
25-Jan-03 61
26-Jan-03 14
27-Jan-03 -10
28-Jan-03 89
29-Jan-03 221
30-Jan-03 221
31-Jan-03 149
1-Feb-03 149
2-Feb-03 -35
3-Feb-03 -35
4-Feb-03 -35
5-Feb-03 9
6-Feb-03 92
7-Feb-03 261
8-Feb-03 669
9-Feb-03 295
10-Feb-03 188
11-Feb-03 220
12-Feb-03 -35
13-Feb-03 -9
14-Feb-03 -35
15-Feb-03 -35
16-Feb-03 -35
17-Feb-03 -35
18-Feb-03 -12
19-Feb-03 -18
20-Feb-03 9
21-Feb-03 -30
22-Feb-03 -20
23-Feb-03 141
24-Feb-03 215
25-Feb-03 361
26-Feb-03 289
27-Feb-03 309
28-Feb-03 162
1-Mar-03 151
2-Mar-03 196
3-Mar-03 151
4-Mar-03 67
5-Mar-03 116
6-Mar-03 110
7-Mar-03 110
8-Mar-03 267
9-Mar-03 278
10-Mar-03 247
11-Mar-03 330
12-Mar-03 373
13-Mar-03 328
14-Mar-03 330
15-Mar-03 302
16-Mar-03 292
17-Mar-03 381
18-Mar-03 414
19-Mar-03 414
20-Mar-03 68
21-Mar-03 -20
22-Mar-03 -35
23-Mar-03 -35
24-Mar-03 -35
25-Mar-03 -35
26-Mar-03 -35
27-Mar-03 -35
28-Mar-03 -35
29-Mar-03 28
30-Mar-03 49
31-Mar-03 57
1-Apr-03 72
2-Apr-03 128
3-Apr-03 17
4-Apr-03 299
5-Apr-03 357
6-Apr-03 305