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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 42° 17'16", long 72° 51'53",
Hampshire County, Hydrologic Unit 01080206, on left bank at
Knightville, 0.2 mi downstream from Knightville Dam, 0.2 mi
upstream from Sykes Brook, 2.4 mi upstream from Middle branch,
3.5 mi north of Huntington, and at mile 29.7.
DRAINAGE AREA--161 mi2.
PERIOD OF RECORD--Discharge: August 1909 to September 1990, October 1995 to current year.
Water-quality records: Water year 1953.
REVISED RECORDS--WSP 415: 1909–12. WSP 1001: 1941–43. WSP 1231: 1910, 1912, 1913(M), 1914–15, 1916–19(M), 1921–23(M), 1925–27(M), 1929–33(M), 1935(M). WDR MA-RI-84-1: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Concrete control since Dec. 20, 1940. Datum of gage is 461.25 ft above National Geodetic Vertical Datum of 1929 (levels by U.S. Army Corps of Engineers). Prior to Jan. 11, 1936, nonrecording gage at site 0.5 mi upstream at different datum. Jan. 11, 1935, to May 20, 1940, water-stage recorder at site 700 ft upstream at datum 10.57 ft higher. May 21 to Dec. 19, 1940, nonrecording gage at site 700 ft upstream at datum 18.75 ft higher.
REMARKS-- Flow regulated by Knightville reservoir since 1941.
COOPERATION BY--U.S. Army Corps of Engineers
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