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Site ID: 1576 Lat. -16.5157 Madagascar Mahajanga
River: Betsiboka Long. 46.7005
Site name: Ambato Boeni Contributing area: 52404 km2 Ratio to Comparison Station: 1.86
Latest measurement: 5-Sep-11 Mean annual runoff: 1390 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 1314.2 mm
Latest M/C ratio: 1.20 Seven day total: 15.5 mm
Estimated current discharge: 1256 m3/sec Percent of mean 7-day total: 114.9 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 9686 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 9400 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 50.7 40.2 43.7 43.1 65.1
1461 2003 176.7 196.1 241.8 187.7 111.7 103.8 95.0 85.6 72.4 66.8 56.0 67.5
1225 2004 104.2 250.7 287.0 174.5 90.6 68.7 54.7 43.2 36.6 15.4 29.9 69.8
1487 2005 185.5 205.2 275.8 189.1 131.8 95.1 57.4 81.2 59.0 48.6 58.7 99.9
951 2006 118.6 153.8 173.7 124.4 98.9 85.7 66.0 54.0 40.2 35.9 0.0 0.0
1617 2007 193.1 265.3 302.3 176.7 127.1 107.8 99.1 89.9 61.0 51.8 57.1 86.2
1477 2008 122.0 258.1 232.8 164.9 120.6 89.5 83.4 72.4 49.0 59.7 80.2 144.1
1509 2009 196.0 237.0 211.7 197.2 151.9 108.8 96.8 73.9 51.4 44.8 38.3 101.2
1314 2010 141.5 181.5 235.9 178.1 100.2 84.4 82.7 63.7 51.6 26.9 50.7 117.0
Mean Annual Runoff (mm): 1390 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 1845
23-Jul-02 1845
24-Jul-02 1742
25-Jul-02 1742
26-Jul-02 1634
27-Jul-02 1838
28-Jul-02 1841
29-Jul-02 1913
30-Jul-02 1960
31-Jul-02 1820
1-Aug-02 2128
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 956
10-Aug-02 956
11-Aug-02 1127
12-Aug-02 1193
13-Aug-02 979
14-Aug-02 1151
15-Aug-02 1100
16-Aug-02 1103
17-Aug-02 1500
18-Aug-02 1286
19-Aug-02 1251
20-Aug-02 1301
21-Aug-02 1449
22-Aug-02 1542
23-Aug-02 1473
24-Aug-02 1456
25-Aug-02 1458
26-Aug-02 1458
27-Aug-02 1258
28-Aug-02 1221
29-Aug-02 934
30-Aug-02 1172
31-Aug-02 1322
1-Sep-02 1320
2-Sep-02 1530
3-Sep-02 991
4-Sep-02 1003
5-Sep-02 909
6-Sep-02 996
7-Sep-02 1028
8-Sep-02 1032
9-Sep-02 1090
10-Sep-02 767
11-Sep-02 767
12-Sep-02 817
13-Sep-02 817
14-Sep-02 930
15-Sep-02 930
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 878
22-Sep-02 1140
23-Sep-02 1140
24-Sep-02 1067
25-Sep-02 1164
26-Sep-02 807
27-Sep-02 807
28-Sep-02 691
29-Sep-02 940
30-Sep-02 804
1-Oct-02 902
2-Oct-02 902
3-Oct-02 665
4-Oct-02 794
5-Oct-02 917
6-Oct-02 703
7-Oct-02 888
8-Oct-02 1075
9-Oct-02 1032
10-Oct-02 874
11-Oct-02 1008
12-Oct-02 769
13-Oct-02 769
14-Oct-02 746
15-Oct-02 832
16-Oct-02 828
17-Oct-02 997
18-Oct-02 1153
19-Oct-02 1322
20-Oct-02 1506
21-Oct-02 1021
22-Oct-02 915
23-Oct-02 578
24-Oct-02 716
25-Oct-02 868
26-Oct-02 849
27-Oct-02 742
28-Oct-02 530
29-Oct-02 530
30-Oct-02 397
31-Oct-02 650
1-Nov-02 586
2-Nov-02 820
3-Nov-02 1039
4-Nov-02 1060
5-Nov-02 1404
6-Nov-02 512
7-Nov-02 7
8-Nov-02 -199
9-Nov-02 7
10-Nov-02 184
11-Nov-02 802
12-Nov-02 927
13-Nov-02 854
14-Nov-02 854
15-Nov-02 523
16-Nov-02 626
17-Nov-02 838
18-Nov-02 1232
19-Nov-02 1443
20-Nov-02 1716
21-Nov-02 2087
22-Nov-02 1229
23-Nov-02 1262
24-Nov-02 811
25-Nov-02 984
26-Nov-02 1080
27-Nov-02 957
28-Nov-02 1018
29-Nov-02 725
30-Nov-02 725
1-Dec-02 627
2-Dec-02 841
3-Dec-02 968
4-Dec-02 707
5-Dec-02 795
6-Dec-02 773
7-Dec-02 555
8-Dec-02 707
9-Dec-02 746
10-Dec-02 868
11-Dec-02 768
12-Dec-02 1038
13-Dec-02 888
14-Dec-02 561
15-Dec-02 1822
16-Dec-02 1822
17-Dec-02 2607
18-Dec-02 2119
19-Dec-02 1130
20-Dec-02 1289
21-Dec-02 892
22-Dec-02 772
23-Dec-02 1835
24-Dec-02 1295
25-Dec-02 856
26-Dec-02 1626
27-Dec-02 1958
28-Dec-02 2342
29-Dec-02 2191
30-Dec-02 2047
31-Dec-02 2029
1-Jan-03 2029
2-Jan-03 1200
3-Jan-03 752
4-Jan-03 453
5-Jan-03 1087
6-Jan-03 1429
7-Jan-03 1782
8-Jan-03 1969
9-Jan-03 1770
10-Jan-03 1632
11-Jan-03 1921
12-Jan-03 1806
13-Jan-03 1231
14-Jan-03 2188
15-Jan-03 2766
16-Jan-03 4540
17-Jan-03 4540
18-Jan-03 4497
19-Jan-03 5286
20-Jan-03 4848
21-Jan-03 5252
22-Jan-03 5776
23-Jan-03 4952
24-Jan-03 5479
25-Jan-03 4465
26-Jan-03 4622
27-Jan-03 5383
28-Jan-03 5787
29-Jan-03 6397
30-Jan-03 5766
31-Jan-03 5595
1-Feb-03 5400
2-Feb-03 5400
3-Feb-03 6569
4-Feb-03 6951
5-Feb-03 6065
6-Feb-03 6045
7-Feb-03 5813
8-Feb-03 4794
9-Feb-03 5319
10-Feb-03 4099
11-Feb-03 4300
12-Feb-03 3762
13-Feb-03 3907
14-Feb-03 4013
15-Feb-03 3795
16-Feb-03 3917
17-Feb-03 4769
18-Feb-03 4769
19-Feb-03 2360
20-Feb-03 2596
21-Feb-03 1080
22-Feb-03 1592
23-Feb-03 2342
24-Feb-03 2618
25-Feb-03 3719
26-Feb-03 4473
27-Feb-03 4531
28-Feb-03 3955
1-Mar-03 3689
2-Mar-03 3041
3-Mar-03 3923
4-Mar-03 4366
5-Mar-03 5943
6-Mar-03 5943
7-Mar-03 6317
8-Mar-03 5879
9-Mar-03 4292