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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 42o03'16", long
70o43'35", Plymouth County, Hydrologic Unit
01090002, 30 ft west of State Highway 3 and about 300 ft north of State
Highway 14 in Duxbury.
AQUIFER.--Sand and gravel aquifer, glaciated regions; outwash deposits.
WELL CHARACTERISTICS--Augered observation water-table well, diameter 2.0 in, depth 42.39 ft, screened 38.11 to 41.19 ft.
INSTRUMENTATION.--Data Collection Platform with satellite telemeter, December 2018 to current year. Monthly measurement prior to December 2018.
DATUM--Elevation of land-surface datum is 55 ft above sea level, from topographic map. Measuring point: Top of casing in base of steel shelter, 2.78 ft above land-surface datum.
PERIOD OF RECORD--December 2018 to current year.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Office of Water Resources.