Site ID: 2581 Lat. 40.7197 USA Pennsylvania
River: Allegheny Long. -79.5802
Site name: Harrison Township Contributing area: 21031 km2 Ratio to Comparison Station: 0.32
Latest measurement: 13-Dec-09 Mean annual runoff: 485 mm (2003-2008)
Hydrologic status: 2 Normal flow Total runoff this year: 643 mm
Latest M/C ratio: 1.03 Seven day total: 1 mm
Estimated current discharge: 418 m3/sec Percent of mean 7-day total: 106.7 % (today's value compared to mean for same period, 2003-2007)
Ice-cover determination: 5 yr recurrence flood: 1127 m3/sec (from Log Pearson III analysis)
Status Codes:  1 = Low flow, 2 = Normal flow, 3 = Flood, 4 = Major Flood 1013 m3/sec (from Gumbel Extreme Value analysis)
Comparison Station Information:  Harrisburg, Pa. (4147700)         Contributing Area:   sq mi 65000 sq km
(Data from this gaging station are used for the calibration to discharge, with an adjustment for different contributing areas)
Notes: Discharge calibration based on comparison of monthly means (maximum flows, minimum flows and mean discharge) from a 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
425 2005 0.0 0.0 4.6 57.0 61.1 8.0 0.0 59.5 62.3 55.7 61.1 55.9
204 2006 21.6 0.0 0.0 0.0 0.0 0.0 0.0 67.2 56.8 58.3 0.0 0.0
668 2007 48.4 13.8 45.9 50.9 71.9 70.7 63.4 73.5 61.5 68.7 54.8 44.1
643 2008 33.0 38.7 40.0 62.7 60.7 67.3 62.5 60.8 63.4 62.1 47.4 44.0
622 2009 32.7 23.3 51.6 54.4 68.2 67.4 64.0 59.1 57.2 57.9 58.5 27.9
Mean Annual Runoff: 485 Standard Deviation: 301
Trend in Annual Runoff (slope):  111.44
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
2581.jpg
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