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The 7-day, 10-year flow (7Q10) is the most commonly used statistical low-flow index in Rhode Island for water-resources planning and management. Flow-duration values are also important indicators of low flows. Methods for estimating the 7Q10flow and flowduration values of streams in Rhode Island at partial-record sites and ungaged sites are based on the knowledge that low flows are sustained almost entirely by the discharge of water from adjacent aquifers.Discharge was determined at 25 low-flow partial-record sites. Relations were developed between base-flow discharges at the partial-record sites and daily mean discharges at eight continuous-record stations. The 7Q10 and flow-duration values at each partialrecord site were established by transferring the 7Q10flow and the selected flow-duration values from the selected continuous-record station through the regression line.A regression equation was developed relating the percentage of underlying stratified drift and till in the contributing drainage area to the 7Q10flow at 21 long-term continuousrecord sites in and around Rhode Island. Coarse-grained stratified drift yields significantly more water to streams during low flow than does till. The regression equation is 7Q10 flow = 0.67 (area of stratified drift) + 0.03 (area of till). The standard error of estimate is 2.6 cubic feet per second, which is equivalent to 40 percent of the mean value, and the correlation coefficient is 0.97.
The 7-day, 10-year flow (7Q10) is the most commonly used statistical low-flow index in Rhode Island for water-resources planning and management. Flow-duration values are also important indicators of low flows. Methods for estimating the 7Q10flow and flowduration values of streams in Rhode Island at partial-record sites and ungaged sites are based on the knowledge that low flows are sustained almost entirely by the discharge of water from adjacent aquifers.Discharge was determined at 25 low-flow partial-record sites. Relations were developed between base-flow discharges at the partial-record sites and daily mean discharges at eight continuous-record stations. The 7Q10 and flow-duration values at each partialrecord site were established by transferring the 7Q10flow and the selected flow-duration values from the selected continuous-record station through the regression line.A regression equation was developed relating the percentage of underlying stratified drift and till in the contributing drainage area to the 7Q10flow at 21 long-term continuousrecord sites in and around Rhode Island. Coarse-grained stratified drift yields significantly more water to streams during low flow than does till. The regression equation is 7Q10 flow = 0.67 (area of stratified drift) + 0.03 (area of till). The standard error of estimate is 2.6 cubic feet per second, which is equivalent to 40 percent of the mean value, and the correlation coefficient is 0.97.
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