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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 41°23’46", long
70°35’34", Dukes County, Hydrologic Unit 01090002, 0.5 mi
west of Airport Road and 0.6 mi north of West Tisbury Road in
AQUIFER--Sand and gravel, glaciated regions; outwash deposits.
WELL CHARACTERISTICS--Drilled observation water-table well, depth 64 ft, screened 61 to 64 ft.
INSTRUMENTATION--Digital recorder with celluar modem, May 2019 to current year. Monthly measurements made by Martha'a Vineyard Commission.
DATUM--Elevation of land-surface datum of gage is 34 ft above National Geodetic Vertical Datum of 1929. Measuring point: Top of well casing 0.02 ft below land surface datum, Dec. 16, 1976 to present.
PERIOD OF RECORD--December 1976 to current year.
COOPERATION BY--Massachusetts Department of Conservation and Recreation, Water Resources Commission..