THAMES RIVER BASIN 01127500 YANTIC RIVER AT YANTIC, CT LOCATION.--Lat 41o33'31", long 72o07'19", New London County, Hydrologic Unit 01100003, on left bank at Yantic, 700 ft. downstream from stone-arch highway bridge, 1 mi downstream from Susquetonscut Brook, and 4.8 mi upstream from mouth. DRAINAGE AREA.--89.3 mi2. PERIOD OF RECORD.--Discharge: October 1930 to current year. Water-quality records: Water years 1958, 1968-80. Daily Suspended-sediment discharge: Water years 1975-80. REVISED RECORDS.--WSP 1051: 1931-36. WSP 1301: 1934(M). WDR CT-78-1: 1970-77 (P). WDR CT-82-1: 1979-80 (P). WDR CT-83-1: Drainage area, 1979 (P), 1982 (P). GAGE.--Water-stage recorder. Datum of gage is 94.46 ft above sea level. REMARKS.--Records good except for periods of estimated record, which are fair. Several measurements of water temperature and specific conductance were made during the water year and are listed in the miscellaneous specific conductance and temperature determinations tables. Low flow regulated by mills upstream. City of Norwich automated flood warning system is on site. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1994 TO SEPTEMBER 1995 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 39 62 173 201 e119 592 126 234 84 17 4.8 3.3 2 36 103 139 300 e115 350 117 308 65 16 4.5 3.2 3 31 84 123 262 e113 235 110 212 56 14 5.0 3.2 4 28 70 113 205 115 189 111 165 59 14 5.0 3.1 5 25 62 166 144 178 169 107 144 58 13 5.1 3.4 6 23 58 357 129 e150 168 88 130 49 11 18 3.4 7 20 56 269 449 e138 166 89 110 51 11 25 3.2 8 20 53 197 518 e127 175 90 94 58 9.4 19 3.4 9 19 53 158 287 e115 598 119 85 51 8.8 14 3.8 10 18 69 152 199 e108 536 215 85 42 8.5 12 3.4 11 16 77 319 167 e103 305 203 143 38 8.4 9.5 3.2 12 17 66 278 157 e100 233 156 273 53 8.4 8.0 3.2 13 20 59 181 187 e96 206 280 227 69 7.8 6.9 3.9 14 22 53 152 239 e94 188 273 176 71 7.2 5.6 4.2 15 19 51 139 262 e92 176 188 182 78 6.9 5.0 3.6 16 16 49 131 310 286 165 151 203 63 6.5 4.7 3.5 17 15 46 127 273 320 174 129 164 49 6.5 4.5 11 18 30 70 160 214 231 250 121 157 40 15 4.1 15 19 36 392 155 190 197 201 157 153 34 12 4.0 9.2 20 38 264 131 252 191 169 246 160 30 9.5 4.0 9.7 21 37 164 116 493 194 170 193 133 27 8.7 4.0 9.9 22 36 367 109 367 182 245 223 109 25 8.4 3.8 9.3 23 38 298 109 286 156 222 182 89 22 8.0 3.7 15 24 68 171 429 245 246 180 150 79 21 7.5 3.6 13 25 67 126 637 214 260 156 136 73 22 6.8 3.4 11 26 62 106 357 189 195 140 117 72 23 6.5 3.6 12 27 25 92 234 170 149 134 109 68 26 6.2 3.8 13 28 29 223 195 e159 287 123 112 61 22 5.9 3.7 12 29 54 411 171 e149 --- 113 111 65 19 5.8 3.4 10 30 53 260 128 e136 --- 107 108 121 18 5.9 3.3 9.2 31 53 --- 124 e124 --- 126 --- 124 --- 5.4 3.3 --- TOTAL 1010 4015 6229 7477 4657 6961 4517 4399 1323 286.0 208.3 214.3 MEAN 32.6 134 201 241 166 225 151 142 44.1 9.23 6.72 7.14 MAX 68 411 637 518 320 598 280 308 84 17 25 15 MIN 15 46 109 124 92 107 88 61 18 5.4 3.3 3.1 CFSM .36 1.50 2.25 2.70 1.86 2.51 1.69 1.59 .49 .10 .08 .08 IN. .42 1.67 2.59 3.11 1.94 2.90 1.88 1.83 .55 .12 .09 .09 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1931 - 1995, BY WATER YEAR (WY) MEAN 80.0 147 203 231 237 344 298 180 112 52.2 45.5 55.1 MAX 676 498 660 1130 531 782 886 409 892 553 245 718 (WY) 1956 1956 1973 1979 1970 1936 1983 1989 1982 1938 1955 1938 MIN 8.15 19.8 28.5 38.7 62.4 137 80.7 56.3 16.3 7.05 5.85 5.83 (WY) 1942 1966 1944 1966 1980 1981 1985 1986 1964 1991 1957 1957 SUMMARY STATISTICS FOR 1994 CALENDAR YEAR FOR 1995 WATER YEAR WATER YEARS 1931 - 1995 ANNUAL TOTAL 52243.9 41296.6 ANNUAL MEAN 143 113 165 HIGHEST ANNUAL MEAN 281 1938 LOWEST ANNUAL MEAN 71.7 1966 HIGHEST DAILY MEAN 1590 Mar 11 637 Dec 25 8690 Jun 6 1982 LOWEST DAILY MEAN 7.0 Aug 4 3.1 Sep 4 2.3 Aug 30 1963 ANNUAL SEVEN-DAY MINIMUM 8.2 Jul 30 3.3 Aug 29 3.0 Aug 30 1963 INSTANTANEOUS PEAK FLOW 744 Mar 9 a13500 Sep 21 1938 INSTANTANEOUS PEAK STAGE 4.90 Mar 9 b14.66 Sep 21 1938 INSTANTANEOUS LOW FLOW c2.8 Sep 3 2.2 Aug 30 1963 ANNUAL RUNOFF (CFSM) 1.60 1.27 1.85 ANNUAL RUNOFF (INCHES) 21.76 17.20 25.10 10 PERCENT EXCEEDS 347 260 365 50 PERCENT EXCEEDS 70 92 95 90 PERCENT EXCEEDS 11 5.0 13 a From computation of flow over two dams 2.4 mi upstream and 3.0 mi downstream from station, respectively. b A slightly higher gage-height 0f 14.88 ft occurred on June 6, 1982, due to reconstruction of the river bank following the flood of 1938. c Also occurred on Sept. 4 and Sept 7. e Estimated