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ICE EFFECTS ON STREAMFLOW
The formation of ice on rivers can cause discharge values to appear unusually high. Display of these erroneous discharge data may result in improper assessment of flow conditions and misuse of the data. For this reason, display of discharge values for streams significantly affected by ice may be disabled from view. Display of discharge data will resume when ice conditions are no longer present. Discharge values for streams minimally affected by ice will continue to be displayed. Flows for streams with these conditions appear to increase during the night and decrease to near-base-line conditions around midday. To estimate the correct discharge for these streams, use the flow rate that corresponds to the bottom of the discharge curve, rather than the peak that corresponds to the top of the curve. Note that this method of estimation is possible only when no surface runoff is occurring. Daily mean discharges for periods of both significant and minimal ice-effect will be estimated and published in the Annual Water-Data Report for the water year in which they occurred.
70o32'26", Barnstable County,
Hydrologic Unit 01090002, on western shore of Ashumet Pond, about 50 ft
south of boat ramp near Falmouth.
AQUIFER--Sand and gravel, glaciated regions; outwash deposits.
INSTRUMENTATION--Digital recorder with cellular telephone telemeter since March 2008. Digital recorder only from June 2002 to March 2008. Monthly or twice-monthly measurements from December 1972 to January 2002.
DATUM--Elevation of pond level is to National Geodetic Vertical Datum of 1929.
PERIOD OF RECORD--Daily mean elevation, June 2002 to current year. Prior to June 2002, monthly or twice-monthly measurements from December 1972 to January 2002 (winter periods not measured; data not published but available in NWIS database only).
REMARKS--Pond level is measured in 3-inch diameter standpipe connected to pond through 0.75-inch diameter siphon tubing.
COOPERATION BY-- Air Force Civil Engineering Center