Calibrated Radar Rainfall Data
3RWW Calibrated Radar Rainfall Data Program
3 Rivers Wet Weather created the calibrated rainfall program in
2001 to provide the 83 ALCOSAN communities with an accurate tool
to analyze and design cost-effective sewer rehabilitation projects
and long-term sewer maintenance plans. By evaluating accurate rainfall
data for their communities, engineers can craft more effective solutions
at a lower cost to the municipalities.
3RWW operates and maintains 34 rain gauges throughout the ALCOSAN service area in Allegheny County, which
collect actual rainfall during wet weather events. The primary radar
source used for Allegheny County is the National Weather Service
KPBZ NEXRAD, located in Moon Township. The radar data gathered during
a wet weather event is calibrated with the rain gauge data collected
during the same time period for every one square kilometer area in
the ALCOSAN service area. The data is processed into even time increments
and presented in 2,276 1x1 km radar grid cells as shown in the illustration map of Allegheny County.
The area of the
map with no grids is called the "cone of silence." This
is the area directly above the radar where the NEXRAD radar antenna
is located, and is therefore unable to "see" or collect
radar data.
To login to the calibrated radar rainfall system, click Here.
While the 3RWW calibrated rainfall program provides "historic"
data— rainfall
measurements are posted one month after a wet weather event— 3 Rivers
Wet Weather also offers a real-time calibrated rainfall
system to help plant operators and municipalities manage sewer
collection system issues that may occur during wet weather events.
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