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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 42o12'47", long
70o55'35", Norfolk County, Hydrologic Unit
01090001, on left bank at base of fish ladder, 100 ft downstream from
Iron Hill Street, 300 ft downstream from Iron Hill Dam, at East
DRAINAGE AREA--12.5 mi2.
PERIOD OF RECORD--December 2001 to current year.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 30.83 ft above Town of Weymouth datum. Subtract 5.83 ft from gage height values to adjust to National Geodetic Vertical Datum of 1929.
REMARKS--Flows affected by withdrawals for public water supply of Weymouth and by changes to boards in fish ladders upstream from the gage. High flows affected by diversions to flood by-pass system at Whitmans and Iron Hill Dams (01105607). The Old Swamp River gage (01105600) is located 0.4 mi upstream from Whitmans Pond and points of water withdrawals and diversions.
COOPERATION BY--Town of Weymouth, MA
Photo of Whitmans Pond Outlet Gage
Photo of fish ladder and stage sensor
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