Site ID: 1236 Lat. -26.9785 South Africa North West
River: Droe Harts Trib Long. 24.2670
Site name: Louwna Contributing area: 641 km2 Ratio to Comparison Station: 0.03
Latest measurement: 15-Nov-09 Mean annual runoff: 175 mm (2003-2007)
Hydrologic status: 2 Normal flow Total runoff this year: 163 mm
Latest M/C ratio: 1.10 Seven day total: 1 mm
Estimated current discharge: 3 m3/sec Percent of mean 7-day total: 100.0 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 17 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 116 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
63 2002 no data no data no data no data no data no data no data 10.7 11.2 13.9 13.4 13.9
161 2003 13.9 12.5 13.9 13.4 13.9 13.4 13.9 13.9 13.4 13.9 11.2 13.9
163 2004 13.9 13.0 13.9 13.4 13.9 13.0 13.9 13.9 13.4 13.9 13.4 13.9
250 2005 13.9 113.5 13.9 13.4 13.9 13.4 1.3 13.9 13.4 13.9 12.5 13.0
136 2006 13.9 12.5 13.9 13.4 13.9 13.4 13.9 13.9 13.4 13.9 0.0 0.0
162 2007 13.9 12.5 13.9 13.4 13.9 13.4 13.9 13.9 13.4 13.9 13.4 12.5
163 2008 13.9 13.0 13.9 13.4 13.9 12.5 13.9 13.9 13.4 13.9 13.4 13.9
144 2009 13.9 12.5 13.9 13.4 13.9 13.4 13.9 13.9 13.4 13.9 8.1 0.0
Discharge is estimated directly via a rating equation from the remote sensing data (M/C ratio) shown below.