THAMES RIVER BASIN 01121000 MOUNT HOPE RIVER NEAR WARRENVILLE, CT LOCATION.--Lat 4150'37", long 7210'10", Windham County, Hydrologic Unit 01100002, on left bank 250 ft downstream from Knowlton Brook, 700 ft upstream from bridge on State Route 89, 1.8 mi south of Warrenville, and 3.2 mi southwest of Ashford. DRAINAGE AREA.--28.6 mi2. PERIOD OF RECORD.--July 1940 to current year. REVISED RECORDS.--WSP 1331: 1941, 1951-53(M). WSP 1721: Drainage area. WDR CT-75-1: 1974 (P). GAGE.--Water-stage recorder. Datum of gage is 335.68 ft above sea level. Satellite telemetry at station. REMARKS.--Records good except for periods of estimated daily discharges, which are fair. Chemical analyses available for water year 1959 (WSP 1641). Occasional regulation from ponds upstream. EXTREMES OUTSIDE PERIOD OF RECORD.--Flood of September 1938 reached a stage of about 14.5 ft, from floodmarks. EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 400 ft3/s and maximum (*): Discharge Gage height Discharge Gage height Date Time (ft3/s) (ft) Date Time (ft3/s) (ft) Feb 14 1915 417 4.21 Apr 22 0400 *1,060 *6.84 Apr 9 1100 437 4.31 Jun 7 0900 431 4.28 Minimum discharge, 2.9 ft3/s, Sept. 9, gage height, 0.99 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 19 15 30 27 e31 83 60 65 34 27 31 4.6 2 10 16 27 29 e30 71 54 70 42 21 25 5.5 3 7.0 160 26 35 e29 62 52 64 76 18 21 6.2 4 16 69 25 43 e28 57 74 57 44 18 19 5.6 5 22 44 24 164 e27 52 73 54 35 28 16 4.4 6 14 34 27 78 e27 48 58 55 81 19 11 3.9 7 9.9 28 100 56 e26 44 52 55 333 14 11 3.4 8 7.9 26 72 46 e26 43 47 58 128 12 10 3.1 9 7.9 23 51 40 e25 42 263 55 79 11 8.7 5.1 10 13 25 43 62 e28 45 149 66 62 9.9 39 8.3 11 21 27 53 118 e28 77 96 124 50 8.5 23 5.5 12 13 22 41 70 e28 276 82 76 69 7.2 15 4.4 13 10 21 35 56 e30 137 68 66 60 6.3 12 7.1 14 16 20 41 e47 193 88 62 88 59 5.7 13 6.9 15 17 20 74 e41 226 75 59 62 52 9.1 13 27 16 12 19 66 e38 111 68 73 50 47 78 20 20 17 11 17 50 e36 74 242 78 46 39 32 19 11 18 51 16 41 e34 61 140 74 50 34 19 14 7.9 19 33 15 36 e32 64 101 78 159 39 14 14 11 20 41 15 37 e30 50 85 66 129 33 12 11 51 21 49 24 78 e29 44 76 140 93 27 10 8.5 25 22 31 21 58 e28 44 70 732 76 24 19 7.3 16 23 41 19 45 e27 46 64 290 68 23 13 7.6 14 24 34 19 e40 e26 72 59 166 101 19 10 14 12 25 25 27 e34 e30 125 60 120 119 16 8.5 11 11 26 21 36 e31 e29 143 56 111 76 17 9.2 8.1 12 27 19 85 e28 e28 122 50 114 59 95 46 7.0 16 28 18 71 e27 e27 155 135 97 50 100 41 6.1 12 29 16 44 e26 e26 111 112 90 46 52 25 5.3 7.9 30 15 34 27 e26 --- 78 75 42 37 20 4.7 6.9 31 15 --- 27 e32 --- 65 --- 38 --- 34 4.7 --- TOTAL 635.7 1012 1320 1390 2004 2661 3553 2217 1806 605.4 430.0 334.7 MEAN 20.5 33.7 42.6 44.8 69.1 85.8 118 71.5 60.2 19.5 13.9 11.2 MAX 51 160 100 164 226 276 732 159 333 78 39 51 MIN 7.0 15 24 26 25 42 47 38 16 5.7 4.7 3.1 CFSM .72 1.18 1.49 1.57 2.42 3.00 4.14 2.50 2.10 .68 .48 .39 IN. .83 1.32 1.72 1.81 2.61 3.46 4.62 2.88 2.35 .79 .56 .44 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1941 - 2000, BY WATER YEAR (WY) MEAN 26.7 47.8 62.9 70.9 73.5 108 93.8 60.5 36.6 15.2 16.0 15.9 MAX 144 131 200 264 203 219 197 119 207 60.4 148 118 (WY) 1956 1956 1997 1979 1970 1972 1983 1984 1982 1972 1955 1954 MIN 3.44 7.64 14.4 12.0 16.2 47.4 29.7 19.0 4.99 1.35 .79 1.05 (WY) 1958 1950 1944 1981 1980 1981 1985 1957 1957 1957 1957 1953 e Estimated. THAMES RIVER BASIN 01121000 MOUNT HOPE RIVER NEAR WARRENVILLE, CT--Continued SUMMARY STATISTICS FOR 1999 CALENDAR YEAR FOR 2000 WATER YEAR WATER YEARS 1941 - 2000 ANNUAL TOTAL 17936.25 17968.8 ANNUAL MEAN 49.1 49.1 52.2 HIGHEST ANNUAL MEAN 75.0 1972 LOWEST ANNUAL MEAN 26.0 1965 HIGHEST DAILY MEAN 614 Mar 4 732 Apr 22 2640 Aug 19 1955 LOWEST DAILY MEAN .62 Sep 4 3.1 Sep 8 .20 Aug 21 1957 ANNUAL SEVEN-DAY MINIMUM .76 Aug 31 4.5 Sep 3 .40 Aug 8 1957 INSTANTANEOUS PEAK FLOW 1060 Apr 22 a5590 Aug 19 1955 INSTANTANEOUS PEAK STAGE 6.84 Apr 22 b10.41 Aug 19 1955 INSTANTANEOUS LOW FLOW 2.9 Sep 9 .15 Aug 25 1957 ANNUAL RUNOFF (CFSM) 1.72 1.72 1.83 ANNUAL RUNOFF (INCHES) 23.33 23.37 24.81 10 PERCENT EXCEEDS 113 98 114 50 PERCENT EXCEEDS 26 34 31 90 PERCENT EXCEEDS 1.6 9.2 4.1 a From rating curve extended above 890 ft3/s on basis of contracted opening of peak flow. b From floodmarks in gage well.