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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.
County, Hydrologic Unit 01090002, 1900 ft Northwest of Greenway
Road on South side of dirt road intersecting with Greenway Road,
2.0 miles North of Sandwich Gate on the Massachusetts Military
AQUIFER--Sand and gravel, glaciated regions; outwash deposits.
WELL CHARACTERISTICS--Augered observation water-table well, diameter 2 in., depth 107 ft, screened 87.13 to 106.67 ft.
INSTRUMENTATION--Data Collection Platform with satellite telemeter, January 2005 to current year.
DATUM--Elevation of land-surface datum is 167.08 ft above National Geodetic Vertical Datum of 1929.
COOPERATION BY--Army Environmental Center, Impact Area Groundwater Study Program