Site ID: 1574 Lat. -15.9447 Madagascar Mahajanga
River: Bemarivo Long. 47.6623
Site name: Ampasimatera Contributing area: 7868 km2 Ratio to Comparison Station: 0.47
Latest measurement: 7-Jan-10 Mean annual runoff: 933 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 1113 mm
Latest M/C ratio: 1.11 Seven day total: 1 mm
Estimated current discharge: 202 m3/sec Percent of mean 7-day total: 71.9 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 714 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 725 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Antsatrana (1389500)         Contributing Area: 7280 sq mi 16866 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Rating equation is based on monthly mean, maximum, and minimum M/C compared to gaging station discharge values.
Discharge and runoff, based on satellite remote sensing (NASA AMSR-E data)
(For U.S, sites, nearby ground station discharge may also be shown)
2008-Present
2002-Present
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
Discharge is estimated directly via a rating equation from the remote sensing data (M/C ratio) shown below.
Explanation:   Green line records upwelling microwave emission from a land parcel (ca 10 km x 10 km) near the river; blue line from a parcel centered over the river.
Brown line is their ratio (M/C; 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. For calibration status, see "notes" entry, above.
When data above show calibration site values lower than for the measurement site, discharge estimation may not be possible.
GoogleEarth View of Measurement Site
1574.jpg
Return