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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 42o18'59", long
71o13'42", Norfolk County, Hydrologic Unit
01090001, on left bank at east limits of Wellesley, 30 ft upstream from
a horseshoe-shaped dam and 50 ft upstream from bridge on State Highway
DRAINAGE AREA--211 mi2.
PERIOD OF RECORD.--August 1959 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 67.12 ft above NAVD 1988. Datum previously reported as 67.92 ft above NGVD 1929.
REMARKS--Records good. Flow affected by diversion to Mother Brook (station 01104000), and by diversions to and from basin for municipal supplies. Occasional regulation at dam 0.2 mi upstream and by other ponds upstream.
COOPERATION BY--Massachusett Department of Conservation and Recreation, Division of Planning and Engineering.
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Value Sep 21