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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 42o11'20", long
71o45'56", Worcester County, Hydrologic Unit
01090003, on right bank, instrument shelter on Elm Court, approximately
20 ft downstream from W. Main Street bridge, stage sensor approximately
50 ft upstream from W. Main Street bridge, at Millbury, MA.
DRAINAGE AREA--71.4 mi2.
PERIOD OF RECORD--July 2002 to current year.
GAGE--Data Collection Platform with satellite telemeter.
REMARKS--Flows affected by effluent releases from Upper Blackstone Waste-Water Treatment Plant located approximately 2.5 mi upstream from gage. High flows may include diversion flood flows through Kettle Brook diversion system with mouth located approximately 2.0 mi upstream from gage.
COOPERATION--Upper Blackstone Water Pollution Abatement District
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Value Apr 24