Site ID: 2109 Lat. 23.6364 China Guangdong
River: Han Long. 116.6450
Site name: Chenghai Contributing area: 29929 km2 Ratio to Comparison Station: 1.29
Latest measurement: 8-Jan-10 Mean annual runoff: 841 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 1134 mm
Latest M/C ratio: 1.36 Seven day total: 1 mm
Estimated current discharge: 753 m3/sec Percent of mean 7-day total: 107.0 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 1939 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1903 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
253 2002 no data no data no data no data no data no data no data 52.9 40.7 39.8 49.6 70.2
662 2003 77.1 56.3 67.2 82.7 55.7 51.4 48.0 57.5 50.5 27.2 38.5 50.2
524 2004 62.3 60.9 53.6 86.3 55.7 30.8 23.5 33.4 25.0 29.9 18.4 44.3
939 2005 57.1 46.8 91.2 94.5 85.4 48.2 54.6 94.5 82.6 84.6 93.0 106.8
944 2006 84.9 83.9 96.5 115.7 93.1 91.7 93.6 110.9 93.8 79.7 0.0 0.0
1137 2007 104.2 94.0 103.1 115.8 104.7 81.6 92.7 89.1 86.8 92.3 82.1 90.6
1134 2008 96.1 84.3 98.7 103.2 100.2 65.8 77.7 110.1 97.9 97.8 95.1 106.8
1207 2009 103.3 98.2 100.1 125.8 106.4 85.6 94.3 112.2 92.3 102.0 88.7 98.2
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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