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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° 34’10", long 71°
01’39", Essex County, Hydrologic Unit 01090001, on right
bank in Peabody, 700 ft downstream from Boston Street Bridge at South
Middleton, 1.3 mi downstream from Wills Brook, and 2 mi south of
DRAINAGE AREA--44.5 mi2.
PERIOD OF RECORD--Discharge: June 1938 to current year.
Water-quality records: Water years 1957, 1959, 1999.
REVISED RECORDS--WSP 1301: 1942(M). WSP 1621: 1938–58 (monthly runoff). WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 44.16 ft above NAVD 1988, from Massachusetts Geodetic Survey benchmark. Datum previously reported as 44.97 ft above NGVD 1929, from Massachusetts Geodetic Survey benchmark.
REMARKS--Flow affected by upstream withdrawals for municipal supply of Lynn, Lynnfield, North Reading, and Wilmington. Occasional regulation by mill upstream Diversions upstream for municipal supply of Reading, Lynn, and Peabody.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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