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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.



USGS 01118500 PAWCATUCK RIVER AT WESTERLY, RI

PROVISIONAL DATA SUBJECT TO REVISION

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LOCATION--Lat 41°23’01", long 71°50’01", Washington County, Hydrologic Unit 01090005, on left bank at Westerly, 2.1 mi downstream from Shunock River.
DRAINAGE AREA--295 mi2.
PERIOD OF RECORD--Discharge: November 1940 to current year.
Water-quality records: Water years 1953, 1963, 1976–2002.
REVISED RECORDS--WSP 1051: drainage area.
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 2.68 ft below sea level NAVD 1988; 1.76 ft below sea level NGVD 1929.
REMARKS--Records good except those for estimated daily discharge, which are fair. Many days are adjusted for tidal backwater, which lasts as much as 4 hours during times of high tide. Diurnal fluctuation at low flow prior to 1962 by mills upstream; regulation much greater prior to 1958. Diversion upstream for municipal supply of Westerly.
COOPERATION BY--Rhode Island Water Resources Board

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Available Parameters Available Period
All 2 Available Parameters for this site
  
00060 Discharge 1990-10-01  2018-02-22
00065 Gage height 2007-10-01  2018-02-22

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Summary of all available data for this site
Instantaneous-data availability statement


Discharge, cubic feet per second

Most recent instantaneous value: 1220 02-22-2018   18:00 EST
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Daily discharge, cubic feet per second -- statistics for Feb 22 based on 76 years of record more
Min
(2002)
25th
percen-
tile
Mean Median 75th
percen-
tile
Most Recent
Instantaneous
Value Feb 22
Max
(1948)
254 551 812 820 1020 1220 1660


Gage height, feet

Most recent instantaneous value: 6.04 02-22-2018   18:00 EST
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