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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.
42o01'22", long 71o34'22",
Worcester County, Hydrologic Unit 01090003, on left bank about 0.7
miles downstream of Central Street bridge, and 0.6 miles southeast of
DRAINAGE AREA--263 mi2.
PERIOD OF RECORD--April 2007 to September 2009, September 2012 to September 2014.
GAGE--Water-stage recorder with telephone telemeter. Elevation of gage, about 200 ft above National Geodetic Vertical Datum of 1929, from topographic map.
REMARKS--Flow regulated by upstream dams and ponds and occasional backwater from downstream dam.
WATER QUALITY RECORDS
PERIOD OF RECORD--Water temperature, specific conductance, pH, and dissolved oxygen, July 1969 to December 1981; Water temperature, specific conductance, and turbidity, September 2012 to current year.
PERIOD OF RECORD--Air temperature and precipitation, September 2012 to current year.
INSTRUMENTATION--Water temperature, specific conductance, and turbidity monitor, air temperature monitor, and heated tipping-bucket precipitation gage.
COOPERATION BY--Massachusetts Department of Environmental Protection, Office of Watershed Management
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