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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.
LOCATION--Lat 42° 40’57", long 72°
06’56", Worcester County, Hydrologic Unit 01080202, on right
bank 100 ft downstream from highway bridge, 3 mi upstream from mouth,
and 3.5 mi west of Winchendon.
DRAINAGE AREA--19.4 mi2.
PERIOD OF RECORD--Discharge: May 1916 to current year. Monthly discharge only October 1917 to July 1918 (published in WSP 1301) and September 1935 to September 1936.
Water-quality records: August 1994.
REVISED RECORDS--WSP 451: 1916. WSP 871: drainage area. WSP 1051: 1919, 1922–24. WSP 1301: 1917(M), 1919–24(M),1926–27(M), 1929(M), 1931–35(M).
GAGE--Data Collection Platform with satellite telemeter. Concrete control since September 1936. Datum of gage is 849.67 ft above National Geodetic Vertical Datum of 1929. Prior to Sept. 11, 1936, non-recording gage on left bank at same datum.
REMARKS--Prior to 1962, occasional diurnal fluctuation at low flow by mill upstream; prior to 1953, regulation at low flow by mill and ponds..
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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