HOUSATONIC RIVER BASIN 01204000 POMPERAUG RIVER AT SOUTHBURY, CT LOCATION.--Lat 4128'50", long 7313'30", 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 1997 TO SEPTEMBER 1998 DAILY MEAN VALUES DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP 1 25 42 147 135 147 199 155 122 206 924 33 17 2 21 285 119 e120 140 180 396 251 119 263 28 16 3 19 226 99 140 136 169 250 217 221 174 25 16 4 19 111 101 159 134 153 208 169 130 135 23 15 5 20 91 108 203 154 144 183 168 96 163 21 14 6 21 71 103 188 140 137 166 287 80 119 22 14 7 19 64 92 207 127 130 156 303 70 101 20 17 8 17 63 85 401 119 124 148 222 64 97 18 22 9 17 218 e76 317 110 996 148 275 62 104 18 18 10 17 326 e74 264 e100 1050 512 524 56 84 17 16 11 17 158 86 214 e95 446 288 648 51 71 18 15 12 17 121 e78 184 294 e290 215 497 61 63 29 14 13 18 99 e73 169 243 e250 188 322 129 58 20 13 14 19 102 e68 e150 e150 e235 173 266 166 52 18 13 15 23 120 e65 142 e125 e220 164 222 242 49 17 13 16 24 113 70 187 e115 210 156 193 225 46 16 13 17 24 105 73 167 e110 e200 157 169 149 51 17 12 18 23 93 72 e154 340 e195 167 165 118 88 30 11 19 24 89 70 e140 302 624 142 145 128 53 39 11 20 24 87 69 e130 248 629 259 127 93 60 23 11 21 23 83 e60 e125 210 396 196 120 78 135 19 11 22 23 191 e50 e120 181 333 162 107 69 69 17 155 23 23 199 88 e115 166 286 156 97 67 72 17 81 24 22 151 113 465 244 289 163 89 67 72 16 39 25 31 126 143 371 288 253 141 93 58 54 15 29 26 45 114 200 239 214 227 137 106 51 44 81 26 27 47 127 164 195 184 214 241 85 47 39 42 100 28 53 109 e120 e170 169 198 161 73 43 35 27 96 29 36 103 e100 e160 --- 182 143 70 41 34 24 48 30 29 102 321 e155 --- 170 132 107 545 33 20 37 31 27 --- 231 e150 --- 161 --- 77 --- 35 18 --- TOTAL 767 3889 3318 6036 4985 9290 5863 6316 3532 3377 748 913 MEAN 24.7 130 107 195 178 300 195 204 118 109 24.1 30.4 MAX 53 326 321 465 340 1050 512 648 545 924 81 155 MIN 17 42 50 115 95 124 132 70 41 33 15 11 CFSM .33 1.73 1.43 2.59 2.37 3.99 2.60 2.71 1.57 1.45 .32 .41 IN. .38 1.93 1.64 2.99 2.47 4.60 2.90 3.13 1.75 1.67 .37 .45 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1933 - 1998, BY WATER YEAR (WY) MEAN 73.5 121 154 165 164 258 236 149 92.4 53.7 54.5 52.4 MAX 625 468 415 525 366 557 693 476 493 272 578 304 (WY) 1956 1956 1997 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 e Estimated. SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1933 - 1998 ANNUAL TOTAL 43576 49034 ANNUAL MEAN 119 134 131 HIGHEST ANNUAL MEAN 208 1984 LOWEST ANNUAL MEAN 53.8 1966 HIGHEST DAILY MEAN 668 Jul 10 1050 Mar 10 9510 Aug 19 1955 LOWEST DAILY MEAN 16 Sep 27 11 Sep 18 3.3 Aug 30 1966 ANNUAL SEVEN-DAY MINIMUM 17 Sep 22 12 Sep 15 3.9 Sep 9 1977 INSTANTANEOUS PEAK FLOW 2580 Mar 9 a29400 Aug 19 1955 INSTANTANEOUS PEAK STAGE 8.18 Mar 9 b21.80 Aug 19 1955 INSTANTANEOUS LOW FLOW d10 Sep 18 c2.5 Aug 30 1966 ANNUAL RUNOFF (CFSM) 1.59 1.79 1.74 ANNUAL RUNOFF (INCHES) 21.58 24.29 23.67 10 PERCENT EXCEEDS 227 261 277 50 PERCENT EXCEEDS 100 110 80 90 PERCENT EXCEEDS 22 18 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 Sept. 20.