Site ID:

1232

Lat.

-30.5135

South Africa

Free State

River:

Orange

Long.

26.0818

Site name:

Bethulie

Contributing area:

64949

km2

Ratio to Comparison Station:

3.85

Latest measurement:

16-Nov-09

Mean annual runoff:

(2003-2007)

Hydrologic status:

Flood

Total runoff this year:

Latest M/C ratio:

1.17

Seven day total:

Estimated current discharge:

1060

m3/sec

Percent of mean 7-day total:

311.4

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

Ice-cover determination:

5 yr recurrence flood:

1536

m3/sec

(from Log Pearson III analysis)

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

1418

m3/sec

(from Gumbel Extreme Value analysis)

Comparison Station Information:

de Hoop 65 (1159500)

Contributing Area:

7280

sq mi

16866

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 monthly mean, maximum, and minimum M/C compared to gaging station discharge values.

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

1.8

8.0

8.1

4.1

3.8

2003

9.2

4.0

6.4

6.9

4.4

3.5

0.3

0.8

0.9

0.4

1.7

6.1

2004

7.7

3.0

-0.7

-1.4

-1.2

-1.4

-1.3

-1.4

-1.2

-0.6

0.1

2005

0.2

-0.1

1.2

0.4

0.7

-0.5

-0.2

-1.0

-0.8

-1.2

35.2

21.1

166

2006

0.3

23.5

34.9

28.2

12.3

12.7

8.5

17.6

15.5

0.0

2007

7.6

12.0

1.9

4.7

4.1

5.5

2.1

5.3

1.5

9.2

9.7

2008

8.9

9.1

15.9

11.0

6.2

5.2

5.7

3.8

3.9

5.4

4.0

6.0

232

2009

10.7

17.6

33.6

31.8

21.2

13.1

17.4

17.0

18.5

28.8

22.3

0.0

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