CONNECTICUT RIVER BASIN 01192500 HOCKANUM RIVER NEAR EAST HARTFORD, CT LOCATION.--Lat 4146'59", long 7235'16", Hartford County, Hydrologic Unit 01080205, on left bank at end of Preston Street, 0.2 mi upstream from bridge on Walnut Street, 1.5 mi downstream from Hop Brook, and 2.8 mi east of East Hartford. DRAINAGE AREA.--73.4 mi2. WATER DISCHARGE RECORDS PERIOD OF RECORD.--September 1919 to September 1921, July 1928 to September 1971. Annual maximum, water years 1972-76 October 1976 to current year. GAGE.--Water-stage recorder. Datum of gage is 53.60 ft above sea level (revised). Prior to October 1, 1981, datum in error by +0.90 ft, original levels by Department of Engineering, City of Hartford. REMARKS.--No estimated daily discharges. Records good. Flow regulated by Shenipsit Lake, small reservoirs, and industrial plants. 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 48 145 120 96 156 195 211 133 218 543 67 54 2 46 261 87 90 150 167 335 193 136 217 61 49 3 49 108 78 89 150 158 263 149 297 153 60 49 4 49 69 81 108 153 151 215 138 153 132 58 48 5 69 61 78 128 187 147 200 138 123 122 57 47 6 54 56 74 114 172 144 193 263 106 112 56 45 7 48 55 71 123 157 136 185 334 103 108 55 89 8 46 78 70 283 151 142 177 195 106 110 53 75 9 45 238 67 216 142 820 192 221 110 112 52 54 10 46 179 67 171 133 938 464 407 99 103 53 49 11 45 94 72 143 128 468 248 500 95 98 61 45 12 44 76 71 127 368 376 201 423 101 97 64 44 13 45 68 71 127 218 309 185 325 167 94 54 42 14 46 79 69 124 169 290 176 269 252 91 52 43 15 46 86 65 111 148 270 165 229 178 88 51 43 16 48 79 64 229 139 234 158 201 151 89 50 44 17 47 72 65 164 142 211 181 192 128 91 58 43 18 46 68 65 141 358 207 171 175 132 96 70 42 19 47 66 64 131 249 493 153 158 141 74 81 40 20 48 65 64 128 204 464 306 146 143 93 56 40 21 48 67 64 121 191 349 189 142 115 105 53 41 22 47 229 61 114 179 334 163 134 109 72 51 169 23 47 155 80 127 173 304 159 129 105 128 49 76 24 48 109 81 699 251 291 167 124 104 111 51 51 25 82 91 121 357 245 276 152 130 99 78 49 48 26 65 83 116 245 202 257 161 128 95 70 146 46 27 89 91 101 216 182 246 163 119 95 67 67 64 28 66 78 89 199 171 224 145 113 94 66 56 70 29 56 76 86 187 --- 212 140 123 94 65 53 54 30 53 81 270 175 --- 201 136 135 556 63 52 47 31 53 --- 142 164 --- 194 --- 147 --- 76 57 --- TOTAL 1616 3063 2674 5447 5268 9208 5954 6213 4405 3524 1853 1651 MEAN 52.1 102 86.3 176 188 297 198 200 147 114 59.8 55.0 MAX 89 261 270 699 368 938 464 500 556 543 146 169 MIN 44 55 61 89 128 136 136 113 94 63 49 40 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1920 - 1998, BY WATER YEAR (WY) MEAN 72.2 93.8 113 130 141 197 194 141 108 74.6 72.4 70.8 MAX 284 381 352 368 371 406 430 262 448 200 289 518 (WY) 1956 1956 1997 1979 1970 1920 1983 1984 1982 1938 1955 1938 MIN 25.8 35.4 31.6 23.2 57.4 82.0 65.2 56.1 36.3 29.5 28.4 27.0 (WY) 1931 1965 1931 1981 1980 1985 1985 1965 1965 1965 1966 1957 SUMMARY STATISTICS FOR 1997 CALENDAR YEAR FOR 1998 WATER YEAR WATER YEARS 1920 - 1998 ANNUAL TOTAL 41844 50876 ANNUAL MEAN 115 139 117 HIGHEST ANNUAL MEAN 176 1938 LOWEST ANNUAL MEAN 55.8 1965 HIGHEST DAILY MEAN 512 Jan 25 938 Mar 10 4300 Sep 21 1938 LOWEST DAILY MEAN 42 Sep 28 40 Sep 19 1.2 Sep 2 1920 ANNUAL SEVEN-DAY MINIMUM 43 Sep 22 42 Sep 15 13 Sep 2 1934 INSTANTANEOUS PEAK FLOW 1400 Mar 9 a5160 Sep 21 1938 INSTANTANEOUS PEAK STAGE 7.79 Mar 9 b13.78 Sep 21 1938 INSTANTANEOUS LOW FLOW d37 Sep 19 c 10 PERCENT EXCEEDS 186 254 222 50 PERCENT EXCEEDS 99 111 87 90 PERCENT EXCEEDS 48 48 38 a By computation of flow over dam just above gage. b From floodmarks. c Practically no flow at times caused by regulation. d Also occurred on Sept. 20 and 21.