CONNECTICUT RIVER BASIN
01155500 WEST RIVER AT JAMAICA, VT
LOCATION.--Lat 43°06'32", long 72°46'33", Windham County, Hydrologic Unit 01080107, on left bank, 0.2 mi upstream from
Depot Street bridge in Jamaica, 0.4 mi upstream from Ball Mountain Brook, and 2.8 mi downstream from Ball Mountain
Dam.
DRAINAGE AREA.--179 mi².
PERIOD OF RECORD.--Discharge records: October 1946 to September 1989, October 1995 to current year.
Water-quality records: water year 1954.
GAGE.--Water-stage recorder. Elevation of gage is 640 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair. Flow regulated since 1961 by
Ball Mountain Reservoir (Reservoirs in Connecticut River Basin).
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 29,500 ft³/s, December 31, 1948, gage height, 14.87 ft, from rating
curve extended above 9,800 ft³/s on basis of slope-area measurement of peak flow; minimum daily, 0.94 ft³/s,
September 23, 24, 1968. Maximum discharge since construction of Ball Mountain Dam in 1961, 5,840 ft³/s,
April 23, 1996, gage height, 9.47 ft; maximum gage height, 11.72 ft, February 7, 1982 (ice jam).
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 3,730 ft³/s, April 28, gage height, 8.57 ft; minimum daily discharge,
18 ft³/s, August 9-12, 15, 17-20.
REVISIONS.--The peak discharges for the water years 1994 and 1996 have been revised to 5,170 ft³/s, April 18, 1994,
gage height, 9.21 ft, and 5,840 ft³/s, April 23, 1996, gage height 9.47 ft, superceding figures published in
reports for 1994 and 1996.
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
1 236 326 292 562 e230 1250 1650 1610 159 25 20 19
2 292 322 853 480 e223 794 1550 1990 190 24 19 19
3 292 322 1820 430 e175 1270 1130 1480 148 33 20 19
4 220 320 2120 467 e126 1410 835 2840 118 34 20 19
5 119 318 2070 468 136 699 873 1940 116 30 20 19
6 116 316 2100 556 127 541 1100 1070 91 24 19 19
7 81 314 1700 638 e129 e535 2100 1360 85 23 19 19
8 61 317 929 629 e127 e480 3010 872 80 23 19 20
9 114 486 563 623 e127 e364 2280 702 75 23 18 19
10 125 1540 465 616 e128 e300 1220 694 69 24 18 19
11 139 2490 329 607 e129 326 753 627 62 23 18 20
12 156 2380 329 597 e124 e337 630 516 41 23 18 29
13 156 1670 345 586 118 e310 695 484 65 23 20 21
14 156 698 357 576 e113 e279 1020 425 60 23 19 20
15 172 254 363 571 e113 e228 1210 370 56 23 18 20
16 180 175 367 581 e113 e222 1260 356 38 24 19 19
17 178 178 384 e589 e114 e222 1820 341 33 24 18 19
18 178 193 425 e572 e114 e234 1780 300 43 24 18 19
19 177 205 456 e542 e116 e220 1260 297 44 24 18 19
20 213 207 461 e512 e124 e225 1240 495 46 22 18 19
21 284 208 454 e437 e331 e193 1240 374 47 22 22 20
22 270 207 448 e253 e526 169 1260 410 47 22 22 19
23 262 206 443 204 568 e175 1320 371 47 21 20 19
24 266 202 471 e210 1410 e192 1430 300 42 21 20 19
25 263 200 585 e216 1600 e241 1010 272 40 21 19 19
26 281 224 562 220 799 365 1300 247 37 21 19 19
27 314 246 559 e208 520 717 1540 206 36 21 19 687
28 329 246 555 e230 1130 809 2860 189 33 21 20 669
29 326 246 560 e259 --- 841 3560 170 25 21 20 40
30 326 246 586 e259 --- 926 2220 156 25 20 20 39
31 326 --- 572 e253 --- 1230 --- 154 --- 20 19 ---
TOTAL 6608 15262 22523 13951 9590 16104 45156 21618 1998 727 596 1946
MEAN 213 509 727 450 343 519 1505 697 66.6 23.5 19.2 64.9
MAX 329 2490 2120 638 1600 1410 3560 2840 190 34 22 687
MIN 61 175 292 204 113 169 630 154 25 20 18 19
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1996 - 1989, 1997, BY WATER YEAR (WY)
MEAN 246 357 356 263 278 555 1280 596 240 129 102 121
MAX 916 787 862 739 1009 1486 2290 1499 831 822 909 606
(WY) 1988 1989 1984 1978 1981 1953 1969 1972 1984 1973 1976 1987
MIN 16.9 65.0 78.7 65.3 42.0 107 499 192 35.8 14.2 16.4 12.5
(WY) 1948 1965 1948 1981 1980 1956 1985 1964 1964 1965 1965 1948
SUMMARY STATISTICS FOR 1997 WATER YEAR WATER YEARS 1996 - 1989, 1996 - 1997
ANNUAL TOTAL 185886 156079
ANNUAL MEAN 508 428 377
HIGHEST ANNUAL MEAN 611 1976
LOWEST ANNUAL MEAN 161 1965
HIGHEST DAILY MEAN 4120 Apr 23 3560 Apr 29 15500 Dec 31 1948
LOWEST DAILY MEAN 18 Sep 3 a 18 Aug 9 .94 Sep 23 1968
ANNUAL SEVEN-DAY MINIMUM 18 Sep 3 18 Aug 14 1.1 Sep 18 1968
INSTANTANEOUS PEAK FLOW 3730 Apr 28 b 29500 Dec 31 1948
INSTANTANEOUS PEAK STAGE 8.57 Apr 28 14.87 Dec 31 1948
ANNUAL RUNOFF (CFSM) 2.84 2.39 2.10
ANNUAL RUNOFF (INCHES) 38.63 32.44 28.58
10 PERCENT EXCEEDS 1560 1250 953
50 PERCENT EXCEEDS 232 223 165
90 PERCENT EXCEEDS 46 19 32
a Also occurred August 10-12, 15, 17-20.
b From rating curve extended above 9,800 ft³/s on basis of slope-area measurement of peak flow.
e Estimated.
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