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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° 45’03", long 71°
26’44", Providence County, Hydrologic Unit 01090004, on left
bank at Cranston, and 0.7 mi upstream from Pocasset River.
DRAINAGE AREA--200 mi2.
PERIOD OF RECORD--December 1939 to current year.
REVISED RECORDS--WSP 971: 1940–42. WSP 1381: 1940–41(M). WDR-MA-NH-RI-VT-73-1: 1972 (adjusted monthly and yearly figures only).
GAGE--Data Collection Platform with satellite telemeter. Datum of gage is 7.20 ft above the North American Vertical Datum of 1988.
REMARKS--Flow regulated by powerplants and by Scituate Reservoir 13 mi upstream, Flat River Reservoir, and other reservoirs, combined usable capacity, about 6,000,000,000 cubic feet. Diversion from Scituate Reservoir for municipal supply of Providence, East Providence, North Providence, Cranston, Greenville, Johnston, East Smithfield, Smithfield, Warwick, West Warwick, Coventry, East Greenwich, and West Greenwich.
COOPERATION BY--Rhode Island Water Resources Board
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Value May 24