USGS Current Conditions for USGS 01100600 SHAWSHEEN RIVER NEAR WILMINGTON, MA

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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.

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USGS 01100600 SHAWSHEEN RIVER NEAR WILMINGTON, MA

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 42°34’05”, long 71°12’55”, Middlesex County, Hydrologic Unit 01070002, on right bank at downstream side of bridge on State Highway 129, 1 mi upstream from Content Brook, and 2.5 mi northwest of Wilmington.
DRAINAGE AREA--36.5 mi².
PERIOD OF RECORD--Discharge: November 1963 to current year.
Water-quality records: Water year 1973.
REVISED RECORDS--WDR MA-NH-RI-VT-74-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 79.61 ft above NAVD 1988. Datum previously reported as 80.44 ft above NGVD 1929.
REMARKS-- Diversion upstream at times each year since 1973 for municipal supply of Burlington.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.