Site ID: 1584 Lat. -22.2215 Madagascar Fianarantsoa
River: Ihosy Long. 46.1142
Site name: Ihosy Contributing area: 2802 km2 Ratio to Comparison Station: 0.10
Latest measurement: 11-Jul-10 Mean annual runoff: 1540 mm (2003-2009)
Hydrologic status: 2 Normal flow Total runoff this year (2010): 789.2 mm
Latest M/C ratio: 1.00 Seven day total: 28.7 mm
Estimated current discharge: 128 m3/sec Percent of mean 7-day total: 97.3 % (today's value compared to mean for same period, 2003-2009)
5 yr recurrence flood: 260 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow or ice, 2 = Normal flow, 3 = Flood, 4 = Major Flood 261 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
559 2002 no data no data no data no data no data no data no data 95.0 98.9 122.7 118.7 123.5
1453 2003 130.0 115.3 134.1 123.4 122.9 119.1 122.7 122.7 118.7 122.7 98.9 122.8
1459 2004 126.9 122.9 122.7 118.7 122.7 114.8 122.7 122.7 118.7 124.8 118.7 122.7
1548 2005 131.3 112.9 132.5 155.7 152.2 125.5 102.9 130.5 118.9 122.7 114.8 148.7
1267 2006 127.7 128.5 152.7 125.6 121.0 117.8 126.2 125.2 119.3 123.0 0.0 0.0
1685 2007 166.6 158.3 187.5 130.7 130.5 152.6 139.8 130.9 120.8 123.2 133.2 110.9
1592 2008 133.7 136.8 161.4 140.6 135.9 130.6 125.7 127.0 118.7 128.0 122.3 131.3
1774 2009 182.3 182.7 172.6 165.0 160.5 135.5 147.6 139.0 119.7 122.7 118.7 127.9
789 2010 123.0 110.8 132.2 125.0 121.4 120.4 56.4 0.0 0.0 0.0 0.0 0.0
Mean Annual Runoff (mm): 1540 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-02 128
23-Jul-02 128
24-Jul-02 128
25-Jul-02 128
26-Jul-02 128
27-Jul-02 128
28-Jul-02 128
29-Jul-02 128
30-Jul-02 128
31-Jul-02 128
1-Aug-02 128
2-Aug-02
3-Aug-02
4-Aug-02
5-Aug-02
6-Aug-02
7-Aug-02
8-Aug-02
9-Aug-02 128
10-Aug-02 128
11-Aug-02 128
12-Aug-02 128
13-Aug-02 128
14-Aug-02 128
15-Aug-02 128
16-Aug-02 128
17-Aug-02 128
18-Aug-02 128
19-Aug-02 128
20-Aug-02 128
21-Aug-02 128
22-Aug-02 128
23-Aug-02 128
24-Aug-02 128
25-Aug-02 128
26-Aug-02 128
27-Aug-02 128
28-Aug-02 128
29-Aug-02 128
30-Aug-02 128
31-Aug-02 128
1-Sep-02 128
2-Sep-02 128
3-Sep-02 128
4-Sep-02 128
5-Sep-02 128
6-Sep-02 128
7-Sep-02 128
8-Sep-02 128
9-Sep-02 128
10-Sep-02 128
11-Sep-02 128
12-Sep-02 128
13-Sep-02 128
14-Sep-02 128
15-Sep-02 128
16-Sep-02
17-Sep-02
18-Sep-02
19-Sep-02
20-Sep-02
21-Sep-02 128
22-Sep-02 128
23-Sep-02 128
24-Sep-02 128
25-Sep-02 128
26-Sep-02 128
27-Sep-02 128
28-Sep-02 128
29-Sep-02 128
30-Sep-02 128
1-Oct-02 128
2-Oct-02 128
3-Oct-02 128
4-Oct-02 128
5-Oct-02 128
6-Oct-02 128
7-Oct-02 128
8-Oct-02 128
9-Oct-02 128
10-Oct-02 128
11-Oct-02 128
12-Oct-02 128
13-Oct-02 128
14-Oct-02 128
15-Oct-02 128
16-Oct-02 128
17-Oct-02 128
18-Oct-02 128
19-Oct-02 128
20-Oct-02 128
21-Oct-02 128
22-Oct-02 128
23-Oct-02 128
24-Oct-02 128
25-Oct-02 128
26-Oct-02 128
27-Oct-02 128
28-Oct-02 128
29-Oct-02 128
30-Oct-02 128
31-Oct-02 128
1-Nov-02 128
2-Nov-02 128
3-Nov-02 128
4-Nov-02 128
5-Nov-02 128
6-Nov-02 128
7-Nov-02 128
8-Nov-02 128
9-Nov-02 128
10-Nov-02 128
11-Nov-02 128
12-Nov-02 128
13-Nov-02 128
14-Nov-02 128
15-Nov-02 128
16-Nov-02 128
17-Nov-02 128
18-Nov-02 128
19-Nov-02 128
20-Nov-02 128
21-Nov-02 128
22-Nov-02 128
23-Nov-02 128
24-Nov-02 128
25-Nov-02 128
26-Nov-02 128
27-Nov-02 128
28-Nov-02 128
29-Nov-02 128
30-Nov-02 128
1-Dec-02 128
2-Dec-02 128
3-Dec-02 128
4-Dec-02 128
5-Dec-02 128
6-Dec-02 128
7-Dec-02 128
8-Dec-02 128
9-Dec-02 128
10-Dec-02 128
11-Dec-02 128
12-Dec-02 128
13-Dec-02 128
14-Dec-02 128
15-Dec-02 128
16-Dec-02 128
17-Dec-02 132
18-Dec-02 136
19-Dec-02 128
20-Dec-02 128
21-Dec-02 128
22-Dec-02 128
23-Dec-02 128
24-Dec-02 128
25-Dec-02 128
26-Dec-02 128
27-Dec-02 128
28-Dec-02 128
29-Dec-02 128
30-Dec-02 128
31-Dec-02 144
1-Jan-03 131
2-Jan-03 128
3-Jan-03 128
4-Jan-03 128
5-Jan-03 128
6-Jan-03 128
7-Jan-03 128
8-Jan-03 128
9-Jan-03 128
10-Jan-03 128
11-Jan-03 128
12-Jan-03 172
13-Jan-03 145
14-Jan-03 155
15-Jan-03 178
16-Jan-03 132
17-Jan-03 131
18-Jan-03 128
19-Jan-03 128
20-Jan-03 158
21-Jan-03 150
22-Jan-03 167
23-Jan-03 128
24-Jan-03 128
25-Jan-03 128
26-Jan-03 128
27-Jan-03 128
28-Jan-03 128
29-Jan-03 128
30-Jan-03 128
31-Jan-03 128
1-Feb-03 128
2-Feb-03 128
3-Feb-03 128
4-Feb-03 128
5-Feb-03 128
6-Feb-03 129
7-Feb-03 147
8-Feb-03 166
9-Feb-03 161
10-Feb-03 156
11-Feb-03 156
12-Feb-03 128
13-Feb-03 128
14-Feb-03 128
15-Feb-03 128
16-Feb-03 128
17-Feb-03 128
18-Feb-03 128
19-Feb-03 128
20-Feb-03 128
21-Feb-03 128
22-Feb-03 128
23-Feb-03 128
24-Feb-03 128
25-Feb-03 128
26-Feb-03 128
27-Feb-03 128
28-Feb-03 128
1-Mar-03 128
2-Mar-03 128
3-Mar-03 128
4-Mar-03 128
5-Mar-03 128
6-Mar-03 128
7-Mar-03 128
8-Mar-03 128
9-Mar-03 128
10-Mar-03 128
11-Mar-03 128
12-Mar-03 128
13-Mar-03 128
14-Mar-03 128
15-Mar-03 128
16-Mar-03 128
17-Mar-03 128
18-Mar-03 128
19-Mar-03 128
20-Mar-03 128
21-Mar-03 145
22-Mar-03 206
23-Mar-03 187
24-Mar-03 161
25-Mar-03 128
26-Mar-03 128
27-Mar-03 135
28-Mar-03 180
29-Mar-03 190
30-Mar-03 160
31-Mar-03 160
1-Apr-03 128
2-Apr-03 128
3-Apr-03 128
4-Apr-03 152
5-Apr-03 181
6-Apr-03 155
7-Apr-03 172
8-Apr-03 128
9-Apr-03 128
10-Apr-03 128
11-Apr-03 128
12-Apr-03 128
13-Apr-03 128
14-Apr-03 128
15-Apr-03 128
16-Apr-03 128
17-Apr-03 128
18-Apr-03 128
19-Apr-03 128
20-Apr-03 128
21-Apr-03 128
22-Apr-03 128
23-Apr-03 128
24-Apr-03 128
25-Apr-03 128
26-Apr-03 128
27-Apr-03 128
28-Apr-03 128
29-Apr-03 128
30-Apr-03 132
1-May-03 128
2-May-03 128
3-May-03 128
4-May-03 128
5-May-03 128
6-May-03 128
7-May-03 128
8-May-03 128
9-May-03 128
10-May-03 128
11-May-03 128
12-May-03 128
13-May-03 128
14-May-03 128
15-May-03 128
16-May-03 128
17-May-03 128
18-May-03 128
19-May-03 132
20-May-03 133
21-May-03 128
22-May-03 128
23-May-03 128
24-May-03 128
25-May-03 128
26-May-03 128
27-May-03 128
28-May-03 128
29-May-03 128
30-May-03 128
31-May-03 128
1-Jun-03 128
2-Jun-03 128
3-Jun-03 128
4-Jun-03 128
5-Jun-03 128
6-Jun-03 128
7-Jun-03 128