Site ID: 1591 Lat. -13.1818 Madagascar Antsiranana
River: Mahavavy Long. 49.0303
Site name: Ambilobe Contributing area: 3289 km2 Ratio to Comparison Station: 0.12
Latest measurement: 11-Jul-10 Mean annual runoff: 956 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 810.5 mm
Latest M/C ratio: 1.10 Seven day total: 6.3 mm
Estimated current discharge: 3 m3/sec Percent of mean 7-day total: 96.1 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 1377 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1899 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
47 2002 no data no data no data no data no data no data no data 2.6 2.2 2.7 2.6 36.8
847 2003 326.7 191.3 113.4 110.3 52.1 31.6 7.5 2.7 2.6 2.7 2.2 4.0
879 2004 118.0 342.4 243.4 100.0 30.1 11.2 2.7 3.4 3.1 2.7 2.6 19.7
732 2005 38.9 139.0 154.2 106.3 46.8 36.1 3.8 42.4 22.4 2.7 42.3 97.2
489 2006 150.5 58.4 131.4 67.2 24.4 19.6 20.7 6.4 3.8 6.7 0.0 0.0
1108 2007 301.2 205.9 239.7 81.9 80.5 45.4 8.1 3.9 6.1 4.8 56.7 73.9
1368 2008 102.0 193.5 221.8 155.3 110.4 96.4 48.8 10.5 41.1 2.7 130.1 254.8
1268 2009 195.9 173.8 148.1 433.8 77.6 39.9 20.2 17.7 2.6 2.7 10.8 144.9
811 2010 188.7 229.3 209.8 74.4 39.8 51.7 16.8 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 956 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 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 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 21
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
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 3
23-Oct-02 3
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 3
4-Nov-02 3
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
12-Nov-02 3
13-Nov-02 3
14-Nov-02 3
15-Nov-02 3
16-Nov-02 3
17-Nov-02 3
18-Nov-02 3
19-Nov-02 3
20-Nov-02 3
21-Nov-02 3
22-Nov-02 3
23-Nov-02 3
24-Nov-02 3
25-Nov-02 3
26-Nov-02 3
27-Nov-02 3
28-Nov-02 3
29-Nov-02 3
30-Nov-02 3
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 23
11-Dec-02 3
12-Dec-02 3
13-Dec-02 3
14-Dec-02 3
15-Dec-02 3
16-Dec-02 3
17-Dec-02 3
18-Dec-02 3
19-Dec-02 40
20-Dec-02 48
21-Dec-02 138
22-Dec-02 138
23-Dec-02 63
24-Dec-02 157
25-Dec-02 157
26-Dec-02 325
27-Dec-02 240
28-Dec-02 3
29-Dec-02 3
30-Dec-02 3
31-Dec-02 3
1-Jan-03 408
2-Jan-03 616
3-Jan-03 616
4-Jan-03 389
5-Jan-03 367
6-Jan-03 259
7-Jan-03 262
8-Jan-03 297
9-Jan-03 356
10-Jan-03 356
11-Jan-03 424
12-Jan-03 263
13-Jan-03 315
14-Jan-03 375
15-Jan-03 364
16-Jan-03 578
17-Jan-03 568
18-Jan-03 495
19-Jan-03 495
20-Jan-03 437
21-Jan-03 428
22-Jan-03 428
23-Jan-03 395
24-Jan-03 369
25-Jan-03 470
26-Jan-03 470
27-Jan-03 367
28-Jan-03 358
29-Jan-03 234
30-Jan-03 307
31-Jan-03 370
1-Feb-03 328
2-Feb-03 366
3-Feb-03 298
4-Feb-03 298
5-Feb-03 469
6-Feb-03 442
7-Feb-03 477
8-Feb-03 383
9-Feb-03 291
10-Feb-03 294
11-Feb-03 294
12-Feb-03 456
13-Feb-03 33
14-Feb-03 3
15-Feb-03 13
16-Feb-03 3
17-Feb-03 154
18-Feb-03 231
19-Feb-03 280
20-Feb-03 280
21-Feb-03 363
22-Feb-03 299
23-Feb-03 248
24-Feb-03 211
25-Feb-03 156
26-Feb-03 169
27-Feb-03 169
28-Feb-03 274
1-Mar-03 206
2-Mar-03 182
3-Mar-03 249
4-Mar-03 218
5-Mar-03 239
6-Mar-03 295
7-Mar-03 139
8-Mar-03 139
9-Mar-03 3
10-Mar-03 3
11-Mar-03 3
12-Mar-03 3
13-Mar-03 266
14-Mar-03 161
15-Mar-03 161
16-Mar-03 262
17-Mar-03 214
18-Mar-03 236
19-Mar-03 162
20-Mar-03 109
21-Mar-03 181
22-Mar-03 82
23-Mar-03 3
24-Mar-03 3
25-Mar-03 3
26-Mar-03 3
27-Mar-03 120
28-Mar-03 172
29-Mar-03 197
30-Mar-03 151
31-Mar-03 151
1-Apr-03 131
2-Apr-03 163
3-Apr-03 221
4-Apr-03 187
5-Apr-03 178
6-Apr-03 220
7-Apr-03 318
8-Apr-03 164
9-Apr-03 164
10-Apr-03 75
11-Apr-03 108
12-Apr-03 120
13-Apr-03 191
14-Apr-03 257
15-Apr-03 232
16-Apr-03 232
17-Apr-03 29
18-Apr-03 34
19-Apr-03 3
20-Apr-03 4
21-Apr-03 31
22-Apr-03 56
23-Apr-03 88
24-Apr-03 89
25-Apr-03 89
26-Apr-03 206
27-Apr-03 162
28-Apr-03 218
29-Apr-03 161
30-Apr-03 66
1-May-03 56
2-May-03 56
3-May-03 316
4-May-03 336
5-May-03 212
6-May-03 182
7-May-03 139
8-May-03 23
9-May-03 44
10-May-03 3
11-May-03 3
12-May-03 3