Site ID: 2555 Lat. 9.0029 Costa Rica 0
River: Grande De Terraba Long. -83.2252
Site name: 0 Contributing area: 2044 km2 Ratio to Comparison Station: 0.04
Latest measurement: 9-Jan-10 Mean annual runoff: 446 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 1175 mm
Latest M/C ratio: 0.94 Seven day total: 1 mm
Estimated current discharge: 28 m3/sec Percent of mean 7-day total: 65.4 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 264 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 231 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Boca del Cerro (4362600)         Contributing Area:   sq mi 50458 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 comparison of montly means from a distant station in the region
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
0 2002 no data no data no data no data no data no data no data 0.0 0.0 0.0 0.0 0.0
0 2003 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
0 2004 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0
734 2005 0.0 0.0 9.1 61.1 99.8 6.4 0.0 107.1 95.6 157.0 105.2 92.7
352 2006 36.9 0.0 0.0 0.0 0.0 0.0 0.0 92.2 106.5 116.6 0.0 0.0
1145 2007 75.6 44.3 32.3 67.4 122.5 109.8 118.2 119.0 98.1 119.8 136.1 101.3
1175 2008 64.9 40.6 42.9 65.1 106.1 108.1 136.7 138.3 100.6 161.1 105.1 105.3
1106 2009 94.8 74.0 58.6 34.8 88.1 93.4 113.7 128.3 106.9 101.6 135.1 76.2
Mean Annual Runoff: 568 Standard Deviation: 533
Trend in Annual Runoff (slope):  -3.5
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
2555.jpg
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