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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 42o12'33", long
71o08'47", Norfolk County, Hydrologic Unit
01090001, on right bank 5 ft upstream from Greenlodge Street Bridge and
about 800 ft upstream from I-95/Rt. 128 near Canton.
DRAINAGE AREA--83.7 mi2.
PERIOD OF RECORD--May 2004 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 40 ft above NGVD 1929 (from topographic map).
REMARKS--Flow affected by municipal supply of Canton and Stoughton and by other diversions upstream..
COOPERATION BY--Town of Canton
Photo of Neponset River streamflow gaging station at Greenlodge Street near Canton
Photo of Neponset River downstream from Greenlodge Street
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Value Apr 23