Site ID:

243

Lat.

15.9573

Thailand

Roi

River:

Chi

Long.

103.9257

Site name:

Selaphum

Contributing area:

41568

km2

Ratio to Comparison Station:

1.79

Latest measurement:

10-Nov-09

Mean annual runoff:

281

(2003-2007)

Hydrologic status:

Normal flow

Total runoff this year:

305

Latest M/C ratio:

1.15

Seven day total:

Estimated current discharge:

179

m3/sec

Percent of mean 7-day total:

57.4

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

Ice-cover determination:

5 yr recurrence flood:

1964

m3/sec

(from Log Pearson III analysis)

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

1982

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

297

2002

no data

4.8

47.5

107.2

83.5

54.4

291

2003

44.5

30.3

6.8

0.8

21.4

9.6

7.8

3.0

66.4

48.6

25.3

26.5

328

2004

33.6

29.9

10.8

0.3

23.3

9.0

5.3

50.3

48.2

48.1

36.2

33.3

239

2005

38.5

24.5

6.0

4.6

8.0

19.7

2.2

5.8

28.7

34.5

46.6

19.9

262

2006

34.8

31.9

14.0

0.6

4.3

71.3

34.4

12.6

0.9

57.5

0.0

286

2007

37.6

46.5

6.6

2.6

12.2

12.8

1.2

5.2

12.9

63.3

60.1

25.4

305

2008

43.6

50.5

14.6

3.4

2.1

17.5

16.3

10.6

6.9

32.2

57.2

50.5

273

2009

84.8

72.5

7.9

0.5

17.6

41.3

19.4

6.3

1.5

11.8

9.1

0.0

Discharge is estimated directly via a rating equation from the remote sensing data (M/C ratio) shown below.