Site ID: 1575 Lat. -16.3049 Madagascar Mahajanga
River: Mahajamba Long. 47.3366
Site name: Morafeno Contributing area: 1595 km2 Ratio to Comparison Station: 0.09
Latest measurement: 7-Jan-10 Mean annual runoff: 836 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 811 mm
Latest M/C ratio: 1.07 Seven day total: 1 mm
Estimated current discharge: 32 m3/sec Percent of mean 7-day total: 58.1 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 141 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 138 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. Watershed should be redrawn.
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
196 2002 no data no data no data no data no data no data no data 44.9 32.3 29.9 37.6 51.6
774 2003 120.4 86.2 94.0 74.7 64.7 61.9 63.9 43.3 39.4 30.0 32.4 63.5
968 2004 75.4 89.6 150.3 123.8 86.4 76.6 71.6 55.0 41.5 44.0 46.9 106.6
953 2005 140.1 86.7 136.2 118.8 89.4 92.7 62.0 54.0 29.5 34.8 38.5 70.1
561 2006 82.5 94.1 78.4 72.0 59.3 51.7 35.4 32.0 28.0 27.9 0.0 0.0
923 2007 90.6 139.0 148.0 114.4 77.2 72.1 69.1 50.8 39.2 31.0 41.0 50.5
811 2008 86.5 116.3 114.2 81.1 71.4 60.7 59.9 42.6 29.8 35.4 34.9 78.1
794 2009 111.5 86.7 87.8 91.6 87.0 76.4 61.5 42.9 32.6 29.1 30.0 57.0
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
1575.jpg
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