Site ID: 2191 Lat. 17.3396 Thailand Sukhothai
River: Yom Long. 99.8393
Site name: Sawankhalok Contributing area: 13818 km2 Ratio to Comparison Station: 0.59
Latest measurement: 9-Jan-10 Mean annual runoff: 291 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 323 mm
Latest M/C ratio: 1.11 Seven day total: 1 mm
Estimated current discharge: 603 m3/sec Percent of mean 7-day total: 120.6 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 1367 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1379 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
36 2002 no data no data no data no data no data no data no data 1.8 0.5 1.2 28.4 4.6
158 2003 5.9 0.6 7.5 11.7 28.6 0.8 0.6 0.6 23.2 49.6 18.1 10.3
223 2004 4.7 6.6 0.8 68.3 2.9 0.6 0.6 14.5 59.0 35.8 10.1 19.5
317 2005 27.5 11.6 2.3 24.9 31.9 2.6 0.9 4.1 40.5 35.2 90.9 44.5
490 2006 43.1 1.9 0.9 17.8 41.9 136.8 37.4 23.1 73.5 113.9 0.0 0.0
269 2007 17.9 0.6 3.1 23.3 24.0 23.0 0.8 24.8 53.5 35.7 38.3 24.0
323 2008 16.5 15.2 4.8 19.5 15.4 0.8 1.5 11.9 24.4 38.7 78.2 96.0
452 2009 54.6 7.5 1.0 46.4 27.4 12.8 0.6 20.4 53.5 75.0 56.3 96.9
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
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