Site ID:

2556

Lat.

10.6788

Costa Rica

River:

San Juan

Long.

-83.6884

Site name:

Contributing area:

41513

km2

Ratio to Comparison Station:

0.82

Latest measurement:

12-Oct-09

Mean annual runoff:

357

(2003-2007)

Hydrologic status:

Normal flow

Total runoff this year:

900

Latest M/C ratio:

1.03

Seven day total:

Estimated current discharge:

850

m3/sec

Percent of mean 7-day total:

152.8

(today's value compared to mean for same period, 2003-2007)

Ice-cover determination:

5 yr recurrence flood:

3230

m3/sec

(from Log Pearson III analysis)

Status Codes: 1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood

2912

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

2002

no data

0.0

2003

0.0

2004

0.0

539

2005

0.0

3.1

62.1

84.3

9.8

0.0

72.1

83.7

72.8

65.1

85.7

335

2006

58.2

0.0

84.7

95.2

96.4

0.0

911

2007

61.6

61.5

80.8

82.9

82.4

85.7

69.6

77.5

91.8

75.9

71.9

69.4

900

2008

88.9

74.4

85.5

77.9

72.4

76.4

57.5

81.1

74.4

65.2

64.3

82.4

770

2009

99.2

91.7

88.4

75.6

70.0

68.4

66.2

88.8

85.3

36.4

0.0

Mean Annual Runoff:

447

Standard Deviation:

410

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.