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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.
42°4103", long 72°0502", Worcester County, Hydrologic Unit
01080202, on right bank 10 ft downstream from Nolan Bridge, 0.3 mi downstream
from Tarbell Brook, 2 mi west of Winchendon, and at mile 32.8.
DRAINAGE AREA--81.8 mi2.
PERIOD OF RECORD--Discharge: June 1916 to current year. March to May 1917, monthly discharge only, published in WSP 1301.
Water-quality records: Water years 1957, 196566, 199495.
GAGE--Data Collection Platform with satellite telemeter. Concrete control since Oct. 6, 1933. Datum of gage is 826.66 ft above National Geodetic Vertical Datum of 1929. Prior to July 27, 1916, nonrecording gage at bridge at same datum.
REMARKS--Flow regulated by powerplant and by Lake
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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Value Feb 23