HOUSATONIC RIVER BASIN 01204000 POMPERAUG RIVER AT SOUTHBURY, CT LOCATION.--Lat 41o28'50", long 73o13'30", New Haven County, Hydrologic Unit 01100005, on right bank 200 ft upstream from bridge on Poverty Road, 800 ft downstream from Bullet Hill Brook, 0.6 mi west of Southbury, and 5.8 mi upstream from mouth. DRAINAGE AREA.--75.1 mi2. PERIOD OF RECORD.--Discharge: June 1932 to current year. Water-quality records: Water years 1961, 1965-74. Daily water temperature: Water years 1961, 1967. Daily specific conductance: Water years 1960-61. Daily pH: Water years 1960-61. Daily iron: Water years 1960-61. REVISED RECORDS.--WSP 851: 1934(M), 1936(M). WSP 1201: 1933-34, 1935(M), 1937(M). WDR CT-83-1: Drainage area. GAGE.--Water-stage recorder. Datum of gage is 165.60 ft above sea level, (levels by Corps of Engineers). REMARKS.--Records good except for periods of estimated record, which are fair. Satellite gage-height telemeter at this station. Flow regulated by Lockwood Reservoir and occasionally at low flow by mill upstream. Diversion for municipal supply of town of Watertown. DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1995 TO SEPTEMBER 1996 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 12 123 132 72 e295 197 130 394 77 37 81 23 2 12 172 144 75 e250 192 442 248 69 33 66 22 3 11 172 127 80 e225 188 240 221 113 156 54 20 4 12 133 140 e67 e205 168 189 244 151 121 90 19 5 20 112 123 e64 e190 177 178 206 123 62 101 18 6 141 106 160 e64 e181 370 166 201 91 47 60 18 7 53 112 137 e62 e175 e300 172 195 76 40 51 24 8 34 211 120 e61 e174 e220 229 177 67 36 47 30 9 28 135 113 e60 256 e200 209 162 63 45 47 30 10 23 112 115 e60 238 e185 257 176 68 56 82 25 11 21 134 e94 e59 222 e180 282 202 68 37 49 24 12 19 1740 e90 e59 e165 198 272 534 61 32 42 22 13 18 534 e86 e59 e152 227 323 272 59 671 74 23 14 39 467 e84 e58 e145 267 264 217 54 420 64 38 15 149 809 103 e58 e140 289 224 189 48 169 48 32 16 62 421 102 e58 e135 281 1130 207 44 185 42 25 17 42 313 97 e57 e130 222 850 266 44 117 47 53 18 34 266 92 e57 e128 202 464 286 74 110 40 293 19 30 313 90 1320 122 189 360 276 63 88 35 148 20 30 249 e87 1680 150 321 304 213 76 89 31 75 21 418 224 e85 515 537 274 273 185 65 67 30 56 22 444 199 e82 361 590 238 242 178 56 56 28 57 23 156 182 e80 296 449 202 231 148 50 56 28 127 24 109 173 e78 648 470 182 223 135 43 66 39 78 25 84 160 e76 866 363 173 195 120 41 59 41 71 26 71 154 e73 405 290 165 186 110 37 121 31 60 27 65 147 e71 1770 254 150 197 105 34 111 27 52 28 662 140 e70 1770 261 143 167 99 33 72 36 51 29 313 135 e69 665 229 147 243 94 31 58 31 221 30 181 132 e67 499 --- 142 319 88 33 55 27 105 31 145 --- 72 397 --- 133 --- 84 --- 67 24 --- TOTAL 3438 8280 3059 12322 7121 6522 8961 6232 1912 3339 1493 1840 MEAN 111 276 98.7 397 246 210 299 201 63.7 108 48.2 61.3 MAX 662 1740 160 1770 590 370 1130 534 151 671 101 293 MIN 11 106 67 57 122 133 130 84 31 32 24 18 CFSM 1.48 3.68 1.31 5.29 3.27 2.80 3.98 2.68 .85 1.43 .64 .82 IN. 1.70 4.10 1.52 6.10 3.53 3.23 4.44 3.09 .95 1.65 .74 .91 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1933 - 1996, BY WATER YEAR (WY) MEAN 70.3 119 150 164 163 258 236 147 92.6 52.7 55.0 53.2 MAX 625 468 367 525 366 557 693 476 493 272 578 304 (WY) 1956 1956 1984 1979 1970 1936 1987 1989 1982 1938 1955 1938 MIN 10.4 13.6 22.1 17.5 44.6 112 61.9 40.3 18.6 9.56 6.29 7.66 (WY) 1936 1965 1936 1981 1936 1989 1985 1941 1957 1957 1966 1953 SUMMARY STATISTICS FOR 1995 CALENDAR YEAR FOR 1996 WATER YEAR WATER YEARS 1933 - 1996 ANNUAL TOTAL 41929.7 64519 ANNUAL MEAN 115 176 130 HIGHEST ANNUAL MEAN 208 1984 LOWEST ANNUAL MEAN 53.8 1966 HIGHEST DAILY MEAN 1740 Nov 12 d1770 Jan 27 9510 Aug 19 1955 LOWEST DAILY MEAN 5.9 Sep 12 11 Oct 3 3.3 Aug 30 1966 ANNUAL SEVEN-DAY MINIMUM 6.3 Sep 6 21 Aug 31 3.9 Sep 9 1977 INSTANTANEOUS PEAK FLOW 5320 Jan 27 a29400 Aug 19 1955 INSTANTANEOUS PEAK STAGE 11.63 Jan 27 b21.80 Aug 19 1955 INSTANTANEOUS LOW FLOW 10 Oct 4 c2.5 Aug 30 1966 ANNUAL RUNOFF (CFSM) 1.53 2.35 1.73 ANNUAL RUNOFF (INCHES) 20.77 31.96 23.52 10 PERCENT EXCEEDS 239 322 276 50 PERCENT EXCEEDS 92 120 79 90 PERCENT EXCEEDS 12 32 16 a From rating curve extended above 1,200 ft3/s by computation of peak flow over dam at gage height 16.0 ft and by slope area measurement of peak flow. b From outside floodmarks. c Also occurred on Aug. 31, 1966. d Also occurred on Jan. 28. e Estimated.