CONNECTICUT RIVER BASIN
01142500 AYERS BROOK AT RANDOLPH, VT
LOCATION.--Lat 43°56'04", long 72°39'30", Orange County, Hydrologic Unit 01080105, on right bank, 135 ft upstream from bridge
on State Highway 12, just north of village limits of Randolph, 0.4 mi upstream from Adams Brook, and 1.2 mi upstream from
mouth.
DRAINAGE AREA.--30.5 mi².
PERIOD OF RECORD.--Discharge records: July 1939 to September 1975, June 1976 to current year.
REVISED RECORDS.--WDR MA-NH-RI-VT-72-l: 1949(M), 1952(M), 1953(P), 1958(P), 1960(M), 1967(M).
GAGE.--Water-stage recorder. Datum of gage is 630.50 ft Vermont State Department of Highways datum. Prior to
October 1, 1964, at site 140 ft downstream at datum 2.25 ft higher and October 1, 1964, to September 30, 1975, at site
140 ft downstream at datum 1.25 ft higher.
REMARKS.--Records good except those for estimated daily discharges, which are fair.
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1830, about 18 ft, present datum, in November 1927.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 350 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 1245 * 657 * 5.73 Feb. 22 1700 490 5.24
Nov. 9 1430 538 5.39 Apr. 7 1945 469 5.17
Dec. 2 1000 562 5.46
Minimum discharge, 5.8 ft³/s, August 8.
REVISIONS.-- Revised daily discharges, in cubic feet per second, for September 21-30, 1996, are given below. These
figures supersede those published in the report of 1996.
Sept. 21... e11 Sept. 23... e11 Sept. 25... e16 Sept. 27... e13 Sept. 29... e43
22... e10 24... e10 26... e15 28... e13 30... e23
MONTH TOTAL MEAN MAX MIN CFSM IN
September 1996 455 15.2 43 10 .50 .55
Water Year 1996 26132.8 71.4 2.34 31.87
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 e18 49 67 e88 e30 93 146 121 52 17 7.5 14
2 e15 46 352 e84 e29 118 125 137 48 21 9.6 13
3 e14 45 163 e76 e29 114 124 142 40 47 15 23
4 e13 43 122 e70 e29 92 143 158 35 39 10 18
5 e13 41 105 e71 e28 85 163 116 33 24 9.6 14
6 e12 40 98 e78 e28 e72 256 132 30 18 10 12
7 e12 41 91 e64 e27 e68 343 156 28 17 9.3 13
8 e12 42 92 e58 e27 e66 282 116 27 17 6.9 14
9 e24 236 83 e52 e26 e60 196 107 25 24 e7.8 12
10 e25 137 78 e48 e25 e57 162 113 23 25 e8.0 11
11 e29 98 75 e46 e24 e54 142 104 21 19 e8.4 11
12 e19 84 73 e43 e24 e51 131 92 22 17 e10 26
13 e20 76 71 e42 e24 e48 151 87 23 17 e39 17
14 e17 69 70 e40 e22 e47 137 80 26 19 e37 15
15 e15 62 71 e39 e22 e45 125 77 25 46 19 13
16 e14 e60 71 e38 e22 e43 130 77 26 36 15 12
17 e15 57 79 e38 e23 e42 146 75 48 22 16 11
18 e14 57 101 e37 e24 e41 185 68 62 22 e12 11
19 e14 58 99 e36 e35 e40 226 70 105 30 e10 10
20 e16 57 86 e36 68 e38 181 78 39 20 e9.0 10
21 433 54 e79 e36 48 e37 176 65 31 17 e25 11
22 190 51 e75 e35 e175 e36 174 67 31 15 56 10
23 109 48 68 e35 e122 e35 166 60 35 16 38 9.5
24 94 46 135 e34 e82 e37 157 56 26 17 33 11
25 75 44 187 e34 e70 e45 140 55 24 16 22 9.8
26 64 51 110 e34 e71 62 130 51 22 16 18 9.4
27 58 48 99 e33 e103 62 121 48 19 16 16 9.1
28 55 e45 92 e33 129 75 191 44 18 16 32 8.5
29 50 42 95 e32 --- 97 168 41 18 14 20 23
30 53 41 98 e31 --- 132 129 40 17 12 16 25
31 58 --- e93 e30 --- 161 --- 43 --- 9.4 14 ---
TOTAL 1570 1868 3178 1451 1366 2053 5046 2676 979 661.4 559.1 406.3
MEAN 50.6 62.3 103 46.8 48.8 66.2 168 86.3 32.6 21.3 18.0 13.5
MAX 433 236 352 88 175 161 343 158 105 47 56 26
MIN 12 40 67 30 22 35 121 40 17 9.4 6.9 8.5
CFSM 1.66 2.04 3.36 1.53 1.60 2.17 5.51 2.83 1.07 .70 .59 .44
IN. 1.91 2.28 3.88 1.77 1.67 2.50 6.15 3.26 1.19 .81 .68 .50
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1939 - 1997, BY WATER YEAR (WY)
MEAN 27.3 39.6 42.0 34.4 33.7 74.3 162 79.6 37.8 19.7 15.3 14.8
MAX 102 102 151 96.8 136 189 289 173 142 85.5 64.0 48.9
(WY) 1946 1960 1984 1996 1981 1979 1969 1972 1947 1973 1989 1981
MIN 2.29 9.05 11.9 9.31 8.27 14.0 46.7 23.4 7.32 2.05 1.90 1.91
(WY) 1964 1954 1948 1981 1940 1940 1995 1941 1965 1965 1965 1963
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1939 - 1997
ANNUAL TOTAL 27660 21813.8
ANNUAL MEAN 75.6 59.8 48.2
HIGHEST ANNUAL MEAN 78.4 1973
LOWEST ANNUAL MEAN 16.7 1965
HIGHEST DAILY MEAN 433 Oct 21 433 Oct 21 1200 Jun 30 1973
LOWEST DAILY MEAN 11 Sep 5 6.9 Aug 8 .80 Aug 2 1965
ANNUAL SEVEN-DAY MINIMUM 12 Sep 1 8.6 Aug 5 .97 Jul 27 1965
INSTANTANEOUS PEAK FLOW 657 Oct 21 a 2600 Jun 30 1973
INSTANTANEOUS PEAK STAGE 5.73 Oct 21 10.37 Jun 30 1973
INSTANTANEOUS LOW FLOW 5.8 Aug 8 .60 Jul 27 1965
ANNUAL RUNOFF (CFSM) 2.48 1.96 1.58
ANNUAL RUNOFF (INCHES) 33.74 26.61 21.49
10 PERCENT EXCEEDS 156 133 110
50 PERCENT EXCEEDS 55 41 27
90 PERCENT EXCEEDS 17 13 6.7
a From rating curve extended above 320 ft³/s on basis of contracted-opening measurement of peak flow.
e Estimated.
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