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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.
72o24'11", Hampshire County,
Hydrologic Unit 01080204, at Knight's Corner, 50 ft east of U.S.
Highway 202 and 70 ft south of the dirt road to Gate 8, Quabbin
AQUIFER--Sand and gravel aquifer (glaciated regions).
WELL CHARACTERISTICS--Augered observation wells, depth 25 ft. Upper casing diameter 2.00 in; screened 21 to 25 ft.
INSTRUMENTATION--Digital recorder with satellite telemeter, March 2008 to current year. Monthly measurements, June 1983 to February 2008.
DATUM--Elevation of land-surface datum is 940 ft above National Geodetic Vertical Datum of 1929. Measuring point: top of well casing, 3.93 ft above land-surface datum.
PERIOD OF RECORD--June 1983 to current year.
COOPERATION BY--Massachusetts Department of Environmental Protection, Division of Watershed Management, Massachusetts Department of Conservation and Recreation