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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.
71o04’08", Norfolk County, Hydrologic Unit
01090001, on right bank, 75 ft downstream from Baker Dam and 100 ft
upstream from Adams Street at Milton Village. From March 14, 2007 to December 10, 2009, at site 20 ft
upstream from Baker Dam.
DRAINAGE AREA.--101 mi2.
PERIOD OF RECORD.--November 1996 to current year.
GAGE.--Data Collection Platform with satellite telemeter. Datum of gage is 4.00 feet above National Geodetic Vertical Datum of 1929 (from station levels). From March 14, 2007 to December 10, 2009, gage was located 20 ft upstream from Baker Dam and set to National Geodetic Vertical Datum of 1929. From November 1996 to March 2007, gage was located 100 ft downstream of Baker Dam at arbitrary datum.
REMARKS.--Flow regulated by mills and reservoirs upstream. Flow affected by diversion from Charles River basin to Neponset River basin by Mother Brook (station 01104000) through Dedham and Hyde Park and by diversions to and from basin for municipal supplies.
On March 14, 2007 the stage sensor was relocated from below Baker Dam to the upstream side of Baker Dam where there is no tidal influence on the stage record. Due to the difficulties in maintaining a stage-discharge rating above Baker Dam, it was decided to relocate the stage sensor in the original gage pool below Baker Dam. The gage was relocated to the original location below Baker Dam on December 10, 2009. The datum for the current location is National Geodetic Vertical Datum of 1929. Tidal spikes will again be visible in the stage record. Falsely high discharges during tidal rises will continue to be removed prior to computation of discharge record. Stage record is affected by high tides is not adjusted.
COOPERATION BY.--Massachusetts Department of Conservation and Recreation, Office of Water Resources.
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