Site ID: 2162 Lat. 21.2369 Vietnam Ha Bac
River: Cau Trib Long. 106.3374
Site name: Luc Nam Contributing area: 5579 km2 Ratio to Comparison Station: 0.24
Latest measurement: 9-Jan-10 Mean annual runoff: 4058 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 8504 mm
Latest M/C ratio: 1.37 Seven day total: 1 mm
Estimated current discharge: 645 m3/sec Percent of mean 7-day total: 106.6 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 3534 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 3418 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
1384 2002 no data no data no data no data no data no data no data 483.7 372.1 122.5 152.6 253.4
2810 2003 240.8 473.5 52.9 1.5 26.8 186.2 418.5 501.2 430.5 207.8 132.4 138.3
1301 2004 158.6 271.1 150.5 3.7 1.6 6.6 151.2 334.3 144.2 36.4 14.1 28.6
4912 2005 34.3 80.7 354.3 165.0 2.0 108.1 463.2 893.6 980.9 820.2 484.5 524.6
4941 2006 660.3 531.1 429.4 50.0 11.7 433.1 823.0 893.7 710.2 398.1 0.0 0.0
6324 2007 640.7 1007.3 244.8 30.8 56.7 379.5 883.6 896.8 795.8 563.3 423.0 401.4
8504 2008 535.9 706.0 1053.2 225.9 22.9 223.8 1006.5 934.4 775.8 964.9 1193.1 861.4
6375 2009 802.2 1011.0 437.1 44.5 36.6 255.9 893.2 726.7 660.7 493.5 482.3 531.6
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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