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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 42o14'52", long
70o59'52", Norfolk County, Hydrologic Unit
01090001, on left bank 200 ft downstream from Miller Styles Road in
Quincy and 0.8 mi upstream from Town River Bay.
DRAINAGE AREA--4.11 mi2.
PERIOD OF RECORD--Water years 1972-86, 1999 to current year.
GAGE--Data Collection Platform with telephone telemeter.
REMARKS--Flows affected by frequent cyclical sump-pump discharges from nearby MBTA station. High flows affected by diversion to by-pass tunnel at site approximately one mile upstream.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering
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Value Jun 25