Site ID: 2123 Lat. 26.9155 China Hunan
River: Xiang Long. 112.6102
Site name: Hengyang Contributing area: 53938 km2 Ratio to Comparison Station: 2.32
Latest measurement: 9-Jan-10 Mean annual runoff: 411 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 419 mm
Latest M/C ratio: 1.25 Seven day total: 1 mm
Estimated current discharge: 924 m3/sec Percent of mean 7-day total: 113.7 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 1919 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 2107 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Tokwe Confluence D/s C/s (1495240)       Contributing Area: 7280 sq mi 23237 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Comparison station is placeholder, only; this site is not yet calibrated to actual discharge
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
163 2002 no data no data no data no data no data no data no data 36.0 34.6 35.8 30.0 26.8
398 2003 35.1 28.6 27.3 30.7 33.9 28.0 54.2 42.9 36.6 36.4 20.9 23.7
365 2004 16.4 25.0 24.4 29.6 34.7 36.8 44.4 31.4 35.4 35.7 30.2 21.2
433 2005 14.9 14.7 31.8 41.8 32.1 38.5 60.5 40.9 41.2 43.4 37.2 36.2
392 2006 32.9 29.4 44.3 33.1 28.2 41.2 61.5 46.3 38.3 36.5 0.0 0.0
465 2007 29.5 33.0 34.3 34.6 34.3 38.7 47.5 50.2 40.3 46.4 45.3 31.0
419 2008 20.5 27.5 41.8 27.0 29.5 33.1 50.0 42.5 40.1 38.6 31.1 37.3
469 2009 33.8 30.5 38.1 33.2 33.9 40.5 46.3 48.5 44.2 48.3 36.3 35.1
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.
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