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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 42o20'14", long
71o06'42", Norfolk County, Hydrologic Unit
01090001, on left bank 20 ft downstream from Netherlands Road bridge
and at Brookline Water Department building, Brookline, MA.
DRAINAGE AREA--5.93 mi2.
PERIOD OF RECORD--November 1999 to October 2000; August 2001 to current year.
GAGE--Data Collection Platform with satellite telemeter and precipitation gage. Datum of gage is 6.467 ft above North American Vertical Datum 1988.
REMARKS--Stage and precipitation data used by MBTA for flood protection of the "D" Line and other nearby structures.
MBTA ACTION STAGE--15 feet, established by MBTA.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
Daily and unit values precipitation data are calibrated and
quality assured prior to publication by the Massachusetts-Rhode Island
Water Science Center. Data are available upon request.
Photo of Muddy River at the gage location