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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 42° 15’18", long 71°
09’53", Norfolk County, Hydrologic Unit 01090001, on right
bank 100 ft upstream from Washington Street Bridge at Dedham and 0.4 mi
downstream from point of diversion from Charles River.
PERIOD OF RECORD--Discharge: October 1931 to current year.
Water-quality records: Water years 1959, 1969–70.
REVISED RECORDS--WSP 1301: 1932(M).
GAGE--Data Collection Platform with satellite telemeter. Concrete control since June 10, 1960. Datum of gage is 0.03 ft below sea level. Dec. 9, 1931, to June 9, 1960, nonrecording gage at site 200 ft upstream at same datum.
REMARKS--Mother Brook is a man-made diversion from Charles River to Neponset River through Dedham and Hyde Park. Drainage area is not applicable. All flows are controlled by the DCR and may appear unusually low or high compared to surrounding streams during certain times of the year.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Division of Planning and Engineering.
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Value Dec 11