ST. LAWRENCE RIVER BASIN
04296000 BLACK RIVER AT COVENTRY, VT
LOCATION.--Lat 44°52'08", long 72°16'14", Orleans County, Hydrologic Unit 01110000, on right bank, 15 ft downstream
from highway bridge, 800 ft upstream from Stony Brook, and 0.4 mi northwest of Coventry.
DRAINAGE AREA.--122 mi².
PERIOD OF RECORD.--Discharge records: October 1951 to current year.
Water-quality records: Water years 1977-94.
GAGE.--Water-stage recorder. Elevation of gage is 725 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair. Occasional diurnal fluctuation at
low flow by mill upstream prior to 1960.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,700 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Dec. 2 1000 2400 6.64 July 16 0115 * 2550 * 6.77
Minimum discharge, 44 ft³/s, October 8 and 9.
DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997
DAILY MEAN VALUES
DAY OCT NOV DEC JAN FEB MAR APR MAY JUN JUL AUG SEP
1 78 136 155 e228 e88 313 612 554 124 48 71 116
2 57 110 1680 e200 e85 523 493 651 127 46 68 118
3 50 99 1270 e185 e83 641 466 536 113 e80 76 114
4 52 92 880 e160 e82 455 531 518 97 e305 74 106
5 52 92 689 e165 e80 370 622 424 89 292 68 91
6 47 106 382 e275 e78 e260 1030 383 82 210 63 81
7 46 115 275 e220 e77 e220 1410 718 76 103 59 75
8 45 112 243 e180 e75 e180 1430 543 71 82 52 72
9 54 301 235 e145 e75 e170 1000 457 67 137 49 69
10 88 506 249 e135 e73 e160 746 446 63 266 47 65
11 113 358 212 e130 e72 e155 524 451 59 204 51 63
12 95 208 194 e125 e69 e145 438 404 57 108 65 64
13 72 155 186 e118 e67 e130 483 414 61 81 137 75
14 63 e125 190 e115 e66 e125 491 338 95 116 405 67
15 61 e115 205 e110 e66 e115 435 277 103 1760 288 62
16 60 e105 213 e108 e65 e110 454 277 75 2130 147 59
17 56 93 268 e108 e64 e108 602 320 65 1460 219 57
18 53 93 444 e107 e70 e105 723 301 69 925 242 55
19 50 104 423 e105 e86 e103 749 256 104 614 134 55
20 51 120 327 e105 e235 e103 758 252 128 364 91 71
21 317 117 241 e102 320 e105 718 235 89 247 121 152
22 675 107 220 e110 520 e107 700 273 84 181 496 120
23 494 99 216 e128 686 e105 679 247 117 145 628 87
24 384 e96 292 e115 536 e102 642 202 99 124 495 89
25 242 e90 638 e110 406 e97 564 180 75 110 311 85
26 164 e82 421 e105 358 e105 506 206 77 98 172 74
27 128 e88 319 e102 305 e130 486 175 81 89 137 67
28 109 e86 267 e100 346 e170 590 147 69 87 163 63
29 102 85 314 e95 --- 393 778 127 59 88 176 68
30 95 85 e390 e92 --- 837 625 120 53 87 140 148
31 136 --- e240 e90 --- 703 --- 122 --- 77 120 ---
TOTAL 4089 4080 12278 4173 5133 7345 20285 10554 2528 10664 5365 2488
MEAN 132 136 396 135 183 237 676 340 84.3 344 173 82.9
MAX 675 506 1680 275 686 837 1430 718 128 2130 628 152
MIN 45 82 155 90 64 97 435 120 53 46 47 55
CFSM 1.08 1.11 3.25 1.10 1.50 1.94 5.54 2.79 .69 2.82 1.42 .68
IN. 1.25 1.24 3.74 1.27 1.57 2.24 6.19 3.22 .77 3.25 1.64 .76
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 1997, BY WATER YEAR (WY)
MEAN 152 195 177 123 123 268 654 286 143 97.0 90.5 88.5
MAX 512 421 473 333 534 611 1164 709 412 405 334 280
(WY) 1991 1960 1984 1996 1981 1976 1969 1972 1973 1973 1976 1977
MIN 28.4 54.6 58.1 43.4 29.1 63.1 196 90.5 43.9 29.1 34.2 19.9
(WY) 1954 1979 1979 1954 1980 1956 1995 1987 1988 1991 1953 1953
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1952 - 1997
ANNUAL TOTAL 89293 88982
ANNUAL MEAN 244 244 199
HIGHEST ANNUAL MEAN 301 1973
LOWEST ANNUAL MEAN 113 1965
HIGHEST DAILY MEAN 1680 Dec 2 2130 Jul 16 3300 Apr 2 1976
LOWEST DAILY MEAN 37 Sep 7 45 Oct 8 a 11 Aug 29 1953
ANNUAL SEVEN-DAY MINIMUM 39 Sep 3 49 Oct 3 11 Aug 28 1953
INSTANTANEOUS PEAK FLOW 2550 Jul 16 3740 Apr 2 1976
INSTANTANEOUS PEAK STAGE 6.77 Jul 16 7.91 Apr 2 1976
INSTANTANEOUS LOW FLOW b 44 Oct 8 11 Aug 29 1953
ANNUAL RUNOFF (CFSM) 2.00 2.00 1.63
ANNUAL RUNOFF (INCHES) 27.23 27.13 22.21
10 PERCENT EXCEEDS 603 574 467
50 PERCENT EXCEEDS 131 124 105
90 PERCENT EXCEEDS 49 64 40
a Also occurred on August 30 to September 1.
b Also occurred on October 9.
e Estimated.
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