Site ID: 1585 Lat. -23.5589 Madagascar Toliara
River: Onilahy Long. 44.3323
Site name: Bezaha Contributing area: 29452 km2 Ratio to Comparison Station: 1.04
Latest measurement: 11-Jul-10 Mean annual runoff: 385 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 91.3 mm
Latest M/C ratio: 1.02 Seven day total: 4.4 mm
Estimated current discharge: 157 m3/sec Percent of mean 7-day total: 52.1 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 2295 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 2181 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
60 2002 no data no data no data no data no data no data no data 11.7 11.8 11.0 10.2 15.5
312 2003 22.4 37.1 70.2 34.3 27.3 30.6 24.4 16.7 11.4 13.1 10.6 14.2
281 2004 18.4 29.6 65.9 23.0 22.1 23.1 25.1 22.5 17.2 12.1 10.1 12.2
437 2005 36.3 72.5 65.1 45.5 45.5 26.5 38.4 31.7 20.1 15.1 10.3 29.8
245 2006 25.8 24.1 45.5 34.7 25.6 28.6 21.1 16.2 12.0 11.6 0.0 0.0
641 2007 83.3 128.5 122.7 65.1 71.4 49.3 38.7 24.6 15.3 15.9 11.8 14.5
364 2008 36.7 31.2 40.9 48.8 37.5 31.7 32.8 24.6 16.5 13.9 15.2 34.4
412 2009 69.4 57.8 63.1 63.3 31.2 28.7 24.2 21.3 13.2 12.1 11.8 15.7
91 2010 12.0 13.4 19.4 12.3 12.0 13.1 9.2 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 385 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-02 169
23-Jul-02 169
24-Jul-02 278
25-Jul-02 278
26-Jul-02 176
27-Jul-02 189
28-Jul-02 171
29-Jul-02 187
30-Jul-02 226
31-Jul-02 230
1-Aug-02 248
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 118
10-Aug-02 118
11-Aug-02 154
12-Aug-02 175
13-Aug-02 211
14-Aug-02 158
15-Aug-02 145
16-Aug-02 123
17-Aug-02 112
18-Aug-02 189
19-Aug-02 176
20-Aug-02 211
21-Aug-02 185
22-Aug-02 165
23-Aug-02 179
24-Aug-02 156
25-Aug-02 163
26-Aug-02 163
27-Aug-02 175
28-Aug-02 153
29-Aug-02 183
30-Aug-02 169
31-Aug-02 154
1-Sep-02 160
2-Sep-02 133
3-Sep-02 117
4-Sep-02 143
5-Sep-02 171
6-Sep-02 181
7-Sep-02 226
8-Sep-02 166
9-Sep-02 142
10-Sep-02 173
11-Sep-02 173
12-Sep-02 122
13-Sep-02 122
14-Sep-02 112
15-Sep-02 112
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 245
22-Sep-02 183
23-Sep-02 183
24-Sep-02 160
25-Sep-02 132
26-Sep-02 150
27-Sep-02 150
28-Sep-02 185
29-Sep-02 157
30-Sep-02 224
1-Oct-02 169
2-Oct-02 169
3-Oct-02 121
4-Oct-02 112
5-Oct-02 112
6-Oct-02 112
7-Oct-02 152
8-Oct-02 141
9-Oct-02 150
10-Oct-02 126
11-Oct-02 112
12-Oct-02 112
13-Oct-02 112
14-Oct-02 115
15-Oct-02 116
16-Oct-02 112
17-Oct-02 112
18-Oct-02 112
19-Oct-02 112
20-Oct-02 112
21-Oct-02 112
22-Oct-02 112
23-Oct-02 112
24-Oct-02 112
25-Oct-02 112
26-Oct-02 112
27-Oct-02 112
28-Oct-02 112
29-Oct-02 112
30-Oct-02 126
31-Oct-02 130
1-Nov-02 158
2-Nov-02 135
3-Nov-02 138
4-Nov-02 120
5-Nov-02 112
6-Nov-02 112
7-Nov-02 112
8-Nov-02 112
9-Nov-02 112
10-Nov-02 112
11-Nov-02 112
12-Nov-02 112
13-Nov-02 112
14-Nov-02 112
15-Nov-02 112
16-Nov-02 113
17-Nov-02 120
18-Nov-02 112
19-Nov-02 112
20-Nov-02 112
21-Nov-02 112
22-Nov-02 112
23-Nov-02 112
24-Nov-02 123
25-Nov-02 113
26-Nov-02 115
27-Nov-02 112
28-Nov-02 112
29-Nov-02 112
30-Nov-02 112
1-Dec-02 112
2-Dec-02 112
3-Dec-02 112
4-Dec-02 112
5-Dec-02 112
6-Dec-02 112
7-Dec-02 112
8-Dec-02 170
9-Dec-02 190
10-Dec-02 150
11-Dec-02 118
12-Dec-02 112
13-Dec-02 112
14-Dec-02 112
15-Dec-02 112
16-Dec-02 112
17-Dec-02 233
18-Dec-02 239
19-Dec-02 197
20-Dec-02 262
21-Dec-02 250
22-Dec-02 250
23-Dec-02 584
24-Dec-02 243
25-Dec-02 238
26-Dec-02 124
27-Dec-02 137
28-Dec-02 117
29-Dec-02 112
30-Dec-02 169
31-Dec-02 166
1-Jan-03 166
2-Jan-03 117
3-Jan-03 112
4-Jan-03 112
5-Jan-03 112
6-Jan-03 112
7-Jan-03 140
8-Jan-03 194
9-Jan-03 117
10-Jan-03 116
11-Jan-03 113
12-Jan-03 123
13-Jan-03 163
14-Jan-03 235
15-Jan-03 237
16-Jan-03 180
17-Jan-03 180
18-Jan-03 160
19-Jan-03 126
20-Jan-03 119
21-Jan-03 184
22-Jan-03 166
23-Jan-03 441
24-Jan-03 896
25-Jan-03 705
26-Jan-03 661
27-Jan-03 396
28-Jan-03 376
29-Jan-03 365
30-Jan-03 247
31-Jan-03 247
1-Feb-03 271
2-Feb-03 271
3-Feb-03 381
4-Feb-03 530
5-Feb-03 688
6-Feb-03 559
7-Feb-03 628
8-Feb-03 414
9-Feb-03 270
10-Feb-03 350
11-Feb-03 483
12-Feb-03 612
13-Feb-03 570
14-Feb-03 621
15-Feb-03 610
16-Feb-03 620
17-Feb-03 566
18-Feb-03 566
19-Feb-03 495
20-Feb-03 375
21-Feb-03 328
22-Feb-03 279
23-Feb-03 202
24-Feb-03 217
25-Feb-03 206
26-Feb-03 349
27-Feb-03 559
28-Feb-03 641
1-Mar-03 515
2-Mar-03 523
3-Mar-03 290
4-Mar-03 246
5-Mar-03 689
6-Mar-03 689
7-Mar-03 1417
8-Mar-03 1279
9-Mar-03 1670
10-Mar-03 1385
11-Mar-03 1385
12-Mar-03 1094
13-Mar-03 658
14-Mar-03 562
15-Mar-03 582
16-Mar-03 594
17-Mar-03 777
18-Mar-03 822
19-Mar-03 768
20-Mar-03 925
21-Mar-03 873
22-Mar-03 873
23-Mar-03 1267
24-Mar-03 736
25-Mar-03 496
26-Mar-03 463
27-Mar-03 334
28-Mar-03 420
29-Mar-03 476
30-Mar-03 480
31-Mar-03 632
1-Apr-03 553
2-Apr-03 545
3-Apr-03 573
4-Apr-03 323
5-Apr-03 433
6-Apr-03 435
7-Apr-03 435
8-Apr-03 438
9-Apr-03 413
10-Apr-03 272
11-Apr-03 299
12-Apr-03 289