PAWCATUCK RIVER BASIN 01118300 PENDLETON HILL BROOK NEAR CLARKS FALLS, CT LOCATION.--Lat 4128'29", long 7150'05", New London County, Hydrologic Unit 01090005, on left bank just upstream from twin culverts on Grindstone Hill Road, 0.1 mi west of State Route 49 in the township of North Stonington, 1.6 mi northwest of Clarks Falls, and 3.4 mi northeast of village of North Stonington. DRAINAGE AREA.--4.02 mi2. PERIOD OF RECORD.--July l958 to current year. REVISED RECORDS.--WDR CT-85-1: 1982 (P). GAGE.--Water-stage recorder. Datum of gage is 152.90 ft above sea level. Satellite telemetry at station. REMARKS.--Records good except for periods of estimated daily discharges, which are fair. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 70 ft3/s and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (ft) Date Time (ft3/s) (ft) Mar 12 0400 80 3.25 Apr 22 0430 *103 *3.65 Minimum discharge, 0.65 ft3/s, July 25, gage height, 1.04 ft. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1999 TO SEPTEMBER 2000 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 2.0 5.3 5.1 4.9 7.5 14 11 12 5.6 2.7 17 .96 2 1.1 5.1 4.6 4.9 e5.0 12 9.8 13 7.1 2.2 10 2.9 3 .80 14 4.5 5.2 e4.4 11 9.2 12 19 1.9 7.2 5.9 4 3.2 12 4.5 6.5 e4.2 9.9 11 10 11 2.0 6.0 6.3 5 5.9 9.1 4.3 26 e4.2 9.0 13 9.5 7.3 1.9 3.6 8.4 6 3.9 7.8 6.9 17 e4.0 8.3 11 9.2 16 1.4 2.4 4.3 7 2.7 6.8 27 12 e3.8 7.5 9.1 8.7 37 1.3 8.0 2.9 8 2.1 6.7 21 9.7 e3.8 7.2 8.3 9.3 21 1.1 6.7 2.4 9 1.8 6.4 14 8.2 3.7 7.0 13 13 14 1.1 3.9 4.9 10 2.6 5.8 12 15 4.2 7.7 12 12 11 1.1 6.8 9.7 11 4.9 5.6 11 26 5.4 15 9.8 15 17 1.0 4.4 4.9 12 3.2 5.1 9.6 17 5.6 64 9.3 12 50 .88 3.0 3.2 13 2.5 4.9 8.3 13 4.7 33 8.0 9.6 31 .79 2.4 5.0 14 4.1 4.8 9.6 10 38 22 7.2 19 22 .76 3.3 3.3 15 3.9 4.7 12 7.9 29 18 7.3 13 18 .86 3.3 15 16 3.2 4.4 11 e6.5 15 16 14 9.2 16 3.2 2.9 14 17 3.0 4.2 9.7 e5.5 11 36 13 7.7 14 1.5 2.3 7.5 18 15 4.1 8.2 e4.8 8.8 27 13 7.4 12 1.2 1.8 4.5 19 11 4.2 7.3 e4.4 10 21 14 12 10 1.0 1.8 4.0 20 16 4.1 6.8 e4.0 8.8 18 12 13 9.2 1.0 1.4 11 21 17 4.9 12 e3.8 8.2 15 15 11 7.5 .87 1.2 7.3 22 13 4.6 10 e3.6 8.2 14 76 9.7 6.6 .83 1.1 4.7 23 14 4.4 8.5 e3.4 9.8 13 42 16 5.7 .75 1.1 3.6 24 11 4.3 e6.0 e3.2 14 12 31 23 4.7 .69 2.4 3.7 25 9.0 4.6 e5.5 e3.2 18 11 24 19 4.1 .68 1.9 3.2 26 7.7 4.9 5.6 e3.0 26 11 22 13 4.0 2.0 1.4 2.9 27 6.9 9.0 e5.0 e2.8 20 10 21 9.7 4.1 4.0 1.2 3.5 28 6.2 11 e4.6 e2.6 19 22 18 8.3 4.7 2.5 1.1 2.9 29 5.9 7.9 e4.6 e2.5 17 22 16 7.4 3.9 1.6 1.1 2.6 30 5.6 6.1 e4.8 e2.5 --- 16 14 6.5 3.4 1.7 .97 2.4 31 5.5 --- 5.0 7.2 --- 13 --- 6.1 --- 18 1.0 --- TOTAL 194.70 186.8 269.0 246.3 321.3 522.6 494.0 356.3 396.9 62.51 112.67 157.86 MEAN 6.28 6.23 8.68 7.95 11.1 16.9 16.5 11.5 13.2 2.02 3.63 5.26 MAX 17 14 27 26 38 64 76 23 50 18 17 15 MIN .80 4.1 4.3 2.5 3.7 7.0 7.2 6.1 3.4 .68 .97 .96 CFSM 1.56 1.55 2.16 1.98 2.76 4.19 4.10 2.86 3.29 .50 .90 1.31 IN. 1.80 1.73 2.49 2.28 2.97 4.84 4.57 3.30 3.67 .58 1.04 1.46 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1959 - 2000, BY WATER YEAR (WY) MEAN 3.81 7.97 11.9 12.4 12.6 16.4 15.3 10.5 6.30 2.56 2.09 2.07 MAX 14.9 19.7 28.8 43.6 22.4 31.5 48.2 23.2 32.4 10.5 12.4 10.4 (WY) 1990 1973 1987 1979 1982 1994 1983 1979 1982 1959 1986 1961 MIN .83 1.12 1.83 1.69 2.95 6.91 4.29 3.93 .82 .17 .12 .049 (WY) 1964 1966 1966 1981 1980 1981 1999 1986 1999 1994 1999 1980 e Estimated. PAWCATUCK RIVER BASIN 01118300 PENDLETON HILL BROOK NEAR CLARKS FALLS, CT--Continued SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1959 - 2000 ANNUAL TOTAL 2617.07 3320.94 ANNUAL MEAN 7.17 9.07 8.64 HIGHEST ANNUAL MEAN 13.1 1984 LOWEST ANNUAL MEAN 4.29 1966 HIGHEST DAILY MEAN 100 Feb 3 76 Apr 22 251 Mar 18 1968 LOWEST DAILY MEAN .03 Aug 7 .68 Jul 25 .01 Sep 9 1980 ANNUAL SEVEN-DAY MINIMUM .03 Aug 31 .83 Jul 19 .01 Sep 9 1980 INSTANTANEOUS PEAK FLOW 103 Apr 22 375 Jun 5 1982 INSTANTANEOUS PEAK STAGE 3.65 Apr 22 6.73 Jun 5 1982 INSTANTANEOUS LOW FLOW .65 Jul 25 .00 Aug 22 1987 ANNUAL RUNOFF (CFSM) 1.78 2.26 2.15 ANNUAL RUNOFF (INCHES) 24.22 30.73 29.19 10 PERCENT EXCEEDS 18 18 19 50 PERCENT EXCEEDS 4.3 6.9 5.8 90 PERCENT EXCEEDS .16 1.8 .57