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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 42o11'26", long 72o36'32",
Hampden County, Hydrologic Unit 01080201, on right bank, 300 ft upstream from
the Interstate 391 bridge behind the flood barrier near water access through
wall at flood barrier mile 85.
DRAINAGE AREA--8,332 mi2.
PERIOD OF RECORD--October 2002 to current year.
GAGE--Data Collection Platform with satellite and telephone telemeters at station.
REMARKS--Flow regulated by power plants, by First Connecticut and
COOPERATION--Holyoke Gas and Electric Co.
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Value Feb 20