CONNECTICUT RIVER BASIN
01153550 WILLIAMS RIVER NEAR ROCKINGHAM, VT
LOCATION.--Lat 43°11'30", long 72°29'08", Windham county, Hydrologic Unit 01080107, on left bank, 50 ft downstream from
highway bridge on Parker Hill Road, 0.2 mi downstream from Divoll Brook, 0.35 mi northeast of Rockingham, 2.2 mi
upstream from mouth, and 4.5 mi northwest of Bellows Falls.
DRAINAGE AREA.--112 mi².
PERIOD OF RECORD.--Discharge records: October 1986 to current year.
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 300 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges which are poor. Low flow regulated by powerplant
upstream October 1986 to September 1992.
EXTREMES OUTSIDE PERIOD OF RECORD.--Flood in September 1938 had greatest discharge since at least 1753.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,600 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Nov. 9 1215 3,250 7.07 Apr. 7 1730 3,410 7.17
Dec. 2 0945 * 3,460 * 7.20
Minimum discharge, 9.3 ft³/s, August 11.
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 42 113 395 e320 e120 e540 707 581 112 19 11 33
2 35 102 1920 318 e115 525 526 579 118 18 10 29
3 32 93 688 e290 e110 498 497 807 96 53 9.9 28
4 29 87 428 e270 e110 331 744 1090 82 84 12 25
5 27 83 333 e270 e105 285 958 565 75 38 21 22
6 27 79 297 355 e105 e290 1430 515 70 28 16 20
7 27 81 266 253 e100 e260 2160 526 64 23 13 21
8 28 96 283 193 e100 e200 1280 391 61 22 12 22
9 161 1480 241 e190 e98 213 698 341 56 27 11 21
10 137 614 220 e185 e96 225 513 352 52 51 10 19
11 137 347 210 e190 e93 210 457 302 47 32 9.7 20
12 79 257 228 e185 e92 187 452 261 43 24 10 134
13 63 209 319 e178 e88 160 928 238 54 21 17 57
14 55 182 286 e175 e86 e150 788 224 47 19 29 38
15 47 153 300 e170 e86 e150 658 215 40 19 18 32
16 43 137 303 e170 e85 e155 683 213 36 38 15 27
17 44 144 356 e165 e85 e145 772 199 35 26 14 24
18 43 140 492 e165 e99 e140 1290 179 47 27 13 23
19 40 141 609 e160 e160 e140 1770 192 65 27 12 22
20 424 144 446 e160 e220 e135 1030 291 48 22 10 21
21 1170 132 e290 e155 e190 e135 909 208 40 21 72 21
22 581 120 e260 e150 e1200 e140 848 198 35 22 137 20
23 289 113 e240 e200 e1450 e130 781 178 31 19 57 19
24 270 108 587 e170 925 e125 698 160 29 17 35 19
25 198 102 1210 e160 605 e120 561 150 30 16 26 18
26 154 303 466 e150 e500 350 532 140 28 15 26 19
27 134 260 356 e140 e700 336 507 125 26 14 32 18
28 122 e150 301 e130 e850 422 1450 115 25 14 112 17
29 111 e140 445 e125 --- 615 1070 104 23 13 111 66
30 111 e130 628 e120 --- 998 657 96 21 12 54 62
31 144 --- 325 e125 --- 1010 --- 95 --- 11 38 ---
TOTAL 4804 6240 13728 5987 8573 9320 26354 9630 1536 792 973.6 917
MEAN 155 208 443 193 306 301 878 311 51.2 25.5 31.4 30.6
MAX 1170 1480 1920 355 1450 1010 2160 1090 118 84 137 134
MIN 27 79 210 120 85 120 452 95 21 11 9.7 17
CFSM 1.38 1.86 3.95 1.72 2.73 2.68 7.84 2.77 .46 .23 .28 .27
IN. 1.60 2.07 4.56 1.99 2.85 3.10 8.75 3.20 .51 .26 .32 .30
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 1997, BY WATER YEAR (WY)
MEAN 146 210 196 161 152 388 680 303 120 65.3 49.2 58.9
MAX 461 382 443 441 306 850 1199 544 242 227 123 282
(WY) 1988 1996 1997 1996 1997 1990 1994 1996 1992 1996 1990 1987
MIN 29.4 71.5 78.2 58.7 51.0 184 156 90.4 34.9 21.3 19.5 13.4
(WY) 1994 1995 1990 1989 1993 1994 1995 1995 1995 1995 1993 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1987 - 1997
ANNUAL TOTAL 108089 88854.6
ANNUAL MEAN 295 243 211
HIGHEST ANNUAL MEAN 283 1996
LOWEST ANNUAL MEAN 111 1995
HIGHEST DAILY MEAN 3110 Apr 16 2160 Apr 7 6670 Mar 31 1987
LOWEST DAILY MEAN 16 Sep 5 9.7 Aug 11 6.9 Sep 7 1995
ANNUAL SEVEN-DAY MINIMUM 17 Sep 1 11 Jul 29 7.5 Sep 2 1995
INSTANTANEOUS PEAK FLOW 3460 Dec 2 a 11500 Mar 31 1987
INSTANTANEOUS PEAK STAGE 7.20 Dec 2 10.59 Mar 31 1987
INSTANTANEOUS LOW FLOW 9.3 Aug 11 9.1 Aug 30 1993
ANNUAL RUNOFF (CFSM) 2.64 2.17 1.88
ANNUAL RUNOFF (INCHES) 35.90 29.51 25.55
10 PERCENT EXCEEDS 640 640 468
50 PERCENT EXCEEDS 144 132 100
90 PERCENT EXCEEDS 30 19 24
a From rating curve extended above 3,800 ft³/s.
e Estimated.
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