--01473000 PERKIOMEN CREEK AT GRATERFORD,
--Lat 40`13'46", long
75`27'07", Montgomery County, Hydrologic Unit 02040203, on
left bank 1,650 ft upstream from highway bridge at Graterford, 0.5 mi
upstream from Landis Brook, and 2.5 mi north of Collegeville.
PERIOD OF RECORD.
--June 1914 to current year. Monthly
discharge only for some periods, published in WSP 1302. Prior to
October 1950, published as "at Graters Ford."
--Water-stage recorder and climatological sensor.
Datum of gage is 112.66 ft above National Geodetic Vertical Datum of
1929. June 1914, to Sept. 6, 1921, non-recording gage at site 1,650 ft
downstream at datum 3.29 ft lower. Sept. 7, 1921, to Sept. 13, 1927,
non-recording gage at present site and datum. Satellite and land-line
telemetry at station.
GAGE HEIGHTS OF IMPORTANCE
Supplied by USGS
: Maximum recordable gage height
(stage sensor operational limit) - 17.5 ft; Data transmitter
operational limit - 18.5 ft;
Supplied by NWS
: Action stage-9 ft, at 8 ft, Park
Avenue in Swenksville is flooded; 9 ft-Flash Flood Alarm sounds at the
County EOC; Flood stage-11 ft, at 10 ft, first evacuations begin in
Swenksville upstream of gage; Moderate flood stage-13 ft, Sewage
treatment plant in Swenksville flooded; Major flood stage-16 ft, at
13.5 ft, houses on left bank in Graterford flood.
--Funding for the operation of this
station is provided by the Pennsylvania Department of Environmental
Protection, the U.S. Army Corps of Engineers, Philadelphia District and
the U.S. Geological Survey.
|The 15-minute precipitation data for this station are
temporary and will only be displayed for 120 days. Time series
of 1-hour or cumulative daily values will NOT be available for
retrieval following the 120-day display period. Although the
instrumentation is calibrated at least once a year, the temporary
classification means that documented routine inspections and other
quality assurance measures are not performed that would make the
data acceptable for archival, retrieval, or future use in general
scientific or interpretive studies.