Site ID: 1574 Lat. -15.9447 Madagascar Mahajanga
River: Bemarivo Long. 47.6623
Site name: Ampasimatera Contributing area: 7868 km2 Ratio to Comparison Station: 0.28
Latest measurement: 5-Sep-11 Mean annual runoff: 989 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 1106.4 mm
Latest M/C ratio: 1.15 Seven day total: 16.4 mm
Estimated current discharge: 224 m3/sec Percent of mean 7-day total: 83.0 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 691 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 707 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
243 2002 no data no data no data no data no data no data no data 48.4 47.0 50.6 43.1 53.8
819 2003 75.3 82.8 100.9 79.4 78.2 65.5 70.5 65.4 60.5 55.5 39.1 46.4
669 2004 70.9 90.4 76.3 71.5 52.9 45.9 51.7 37.8 41.7 39.8 46.2 44.2
957 2005 57.7 56.2 103.4 139.3 119.7 89.6 65.8 94.7 71.5 68.8 37.6 52.6
903 2006 76.3 94.8 122.9 122.9 101.6 90.6 85.0 78.3 69.3 60.9 0.0 0.0
1319 2007 109.6 143.2 192.4 150.3 129.5 107.1 98.7 101.4 96.8 77.2 63.4 49.1
1113 2008 90.2 122.9 153.3 131.7 120.4 94.8 95.5 85.2 72.4 57.3 36.1 53.3
1144 2009 102.1 113.1 107.4 133.2 132.2 110.3 102.7 86.5 78.1 70.4 62.3 45.9
1106 2010 74.6 97.5 133.6 135.6 115.2 99.1 100.2 89.9 73.7 60.3 44.6 82.1
Mean Annual Runoff (mm): 989 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-02 299
23-Jul-02 299
24-Jul-02 274
25-Jul-02 274
26-Jul-02 190
27-Jul-02 201
28-Jul-02 167
29-Jul-02 170
30-Jul-02 181
31-Jul-02 160
1-Aug-02 177
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 244
10-Aug-02 244
11-Aug-02 221
12-Aug-02 213
13-Aug-02 203
14-Aug-02 211
15-Aug-02 215
16-Aug-02 216
17-Aug-02 217
18-Aug-02 221
19-Aug-02 221
20-Aug-02 173
21-Aug-02 172
22-Aug-02 137
23-Aug-02 149
24-Aug-02 171
25-Aug-02 154
26-Aug-02 154
27-Aug-02 153
28-Aug-02 158
29-Aug-02 132
30-Aug-02 134
31-Aug-02 121
1-Sep-02 138
2-Sep-02 179
3-Sep-02 147
4-Sep-02 147
5-Sep-02 134
6-Sep-02 153
7-Sep-02 193
8-Sep-02 193
9-Sep-02 193
10-Sep-02 209
11-Sep-02 209
12-Sep-02 144
13-Sep-02 144
14-Sep-02 62
15-Sep-02 62
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 138
22-Sep-02 179
23-Sep-02 179
24-Sep-02 192
25-Sep-02 220
26-Sep-02 225
27-Sep-02 225
28-Sep-02 230
29-Sep-02 213
30-Sep-02 175
1-Oct-02 179
2-Oct-02 179
3-Oct-02 162
4-Oct-02 168
5-Oct-02 151
6-Oct-02 151
7-Oct-02 112
8-Oct-02 147
9-Oct-02 144
10-Oct-02 155
11-Oct-02 199
12-Oct-02 139
13-Oct-02 139
14-Oct-02 93
15-Oct-02 113
16-Oct-02 99
17-Oct-02 131
18-Oct-02 146
19-Oct-02 154
20-Oct-02 203
21-Oct-02 205
22-Oct-02 205
23-Oct-02 155
24-Oct-02 156
25-Oct-02 119
26-Oct-02 132
27-Oct-02 159
28-Oct-02 124
29-Oct-02 124
30-Oct-02 135
31-Oct-02 131
1-Nov-02 148
2-Nov-02 139
3-Nov-02 125
4-Nov-02 160
5-Nov-02 170
6-Nov-02 212
7-Nov-02 212
8-Nov-02 115
9-Nov-02 145
10-Nov-02 122
11-Nov-02 131
12-Nov-02 175
13-Nov-02 130
14-Nov-02 130
15-Nov-02 97
16-Nov-02 116
17-Nov-02 82
18-Nov-02 90
19-Nov-02 93
20-Nov-02 87
21-Nov-02 125
22-Nov-02 152
23-Nov-02 152
24-Nov-02 179
25-Nov-02 136
26-Nov-02 117
27-Nov-02 117
28-Nov-02 82
29-Nov-02 95
30-Nov-02 95
1-Dec-02 79
2-Dec-02 110
3-Dec-02 122
4-Dec-02 106
5-Dec-02 113
6-Dec-02 94
7-Dec-02 87
8-Dec-02 100
9-Dec-02 100
10-Dec-02 84
11-Dec-02 249
12-Dec-02 325
13-Dec-02 271
14-Dec-02 372
15-Dec-02 228
16-Dec-02 228
17-Dec-02 273
18-Dec-02 244
19-Dec-02 165
20-Dec-02 171
21-Dec-02 149
22-Dec-02 129
23-Dec-02 189
24-Dec-02 137
25-Dec-02 137
26-Dec-02 75
27-Dec-02 121
28-Dec-02 114
29-Dec-02 81
30-Dec-02 113
31-Dec-02 133
1-Jan-03 133
2-Jan-03 110
3-Jan-03 124
4-Jan-03 94
5-Jan-03 157
6-Jan-03 219
7-Jan-03 270
8-Jan-03 332
9-Jan-03 371
10-Jan-03 371
11-Jan-03 399
12-Jan-03 370
13-Jan-03 333
14-Jan-03 275
15-Jan-03 237
16-Jan-03 103
17-Jan-03 103
18-Jan-03 226
19-Jan-03 257
20-Jan-03 219
21-Jan-03 273
22-Jan-03 216
23-Jan-03 228
24-Jan-03 389
25-Jan-03 112
26-Jan-03 112
27-Jan-03 37
28-Jan-03 45
29-Jan-03 128
30-Jan-03 261
31-Jan-03 353
1-Feb-03 377
2-Feb-03 377
3-Feb-03 264
4-Feb-03 278
5-Feb-03 225
6-Feb-03 267
7-Feb-03 252
8-Feb-03 244
9-Feb-03 343
10-Feb-03 363
11-Feb-03 363
12-Feb-03 294
13-Feb-03 225
14-Feb-03 123
15-Feb-03 150
16-Feb-03 151
17-Feb-03 293
18-Feb-03 293
19-Feb-03 277
20-Feb-03 258
21-Feb-03 230
22-Feb-03 239
23-Feb-03 259
24-Feb-03 334
25-Feb-03 355
26-Feb-03 257
27-Feb-03 257
28-Feb-03 190
1-Mar-03 195
2-Mar-03 253
3-Mar-03 186
4-Mar-03 129
5-Mar-03 186
6-Mar-03 186
7-Mar-03 321
8-Mar-03 294
9-Mar-03 233
10-Mar-03 181
11-Mar-03 181
12-Mar-03 322
13-Mar-03 386
14-Mar-03 568
15-Mar-03 568
16-Mar-03 241
17-Mar-03 304
18-Mar-03 284
19-Mar-03 327
20-Mar-03 426