MERRIMACK RIVER BASIN
01075800 STEVENS BROOK NEAR WENTWORTH, NH
LOCATION.--Lat 43°50'12", long 71°53'07", Grafton County, Hydrologic Unit 01070001, on left bank, 150 ft upstream from
highway bridge, 0.2 mi upstream from mouth, and 2.5 mi southeast of Wentworth.
DRAINAGE AREA.--2.94 mi².
PERIOD OF RECORD.--Discharge records: May 1963 to current year.
GAGE.--Water-stage recorder. Elevation of gage is 595 ft above sea level, from topographic map.
REMARKS.--Records good except those for periods of estimated daily discharges, which are fair, and those below
1.0 ft³/s, which are poor.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 1,120 ft³/s, June 30, 1973, gage height, 6.36 ft, from rating curve
extended above 320 ft³/s; minimum discharge, several days in 1963-65, 1971, 1975, 1977, 1978.
EXTREMES FOR CURRENT YEAR.--Peak discharge greater than base discharge of 90 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 21 1130 * 276 * 3.59 Feb. 28 0315 146 3.08
Nov. 9 1115 236 3.45 Apr. 7 1600 97 2.84
Dec. 2 0900 211 3.36 Apr. 18 1700 165 3.17
Feb. 23 0430 181 3.24
Minimum discharge, 0.09 ft³/s, October 3, 4, gage height 1.02 ft
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 .10 2.8 16 e3.3 1.1 7.2 9.2 24 2.2 .22 .25 1.5
2 .10 2.5 93 3.0 1.1 8.2 7.2 21 2.0 .20 .23 1.1
3 .11 2.3 28 2.9 1.1 10 7.5 12 1.7 .70 .29 1.8
4 .12 2.1 14 2.4 1.0 5.9 11 16 1.5 .92 .22 1.7
5 .13 2.1 9.6 2.7 1.1 4.5 15 9.6 1.4 .51 .22 1.2
6 .14 2.0 8.1 3.7 1.1 4.4 34 19 1.2 .36 .21 .83
7 .15 2.0 6.8 2.9 1.1 3.6 57 34 1.1 .60 .19 .70
8 .17 2.3 7.5 2.0 1.1 e3.3 32 16 1.0 .70 .18 .73
9 .90 88 5.6 e1.8 1.1 e3.1 15 13 .85 .64 .21 .77
10 .98 22 4.8 e1.8 1.0 2.8 12 18 .79 4.8 .20 .63
11 2.1 9.9 4.5 1.8 .97 2.4 11 16 .66 1.7 .18 .54
12 .90 6.4 4.4 1.7 .97 2.2 9.4 12 .65 .87 .19 .69
13 .37 4.8 5.2 1.6 .94 e2.1 10 12 1.1 .53 .72 .73
14 .26 3.8 4.5 1.6 .94 2.2 9.7 10 .85 .44 .54 .63
15 .25 3.0 4.5 1.5 .97 2.2 8.6 11 .62 15 .30 .51
16 .23 2.7 4.3 e1.5 .91 1.9 13 14 .52 6.5 .30 .41
17 .22 2.6 12 e1.7 .87 1.9 17 11 .49 2.3 .24 .35
18 .20 2.7 26 e1.5 .92 1.7 71 8.7 .82 11 .21 .34
19 .20 2.7 19 1.4 1.6 1.7 71 8.2 4.6 16 .19 .31
20 2.2 2.5 10 1.4 2.4 1.7 30 9.2 2.1 5.0 .18 .54
21 114 2.2 e6.3 1.3 1.7 1.7 21 7.7 1.2 2.4 .61 .62
22 25 2.0 e5.6 1.2 e3.7 1.7 16 6.6 .96 1.9 2.9 .55
23 9.9 1.9 4.7 1.4 94 1.6 15 5.7 .89 1.3 1.4 .53
24 6.9 1.7 13 1.1 5.9 1.5 14 5.0 .65 .97 .83 .49
25 4.9 1.6 27 1.3 e3.5 1.5 10 4.8 .53 .78 .54 .43
26 3.5 2.5 12 1.5 2.5 4.3 10 4.4 .45 .61 .41 .42
27 2.9 2.2 6.6 1.2 e4.5 3.3 11 3.7 .37 .51 .36 .37
28 3.2 e1.7 5.0 1.2 e45 5.0 27 3.3 .33 .43 2.0 .34
29 3.1 e1.6 e4.3 1.1 --- 10 18 2.8 .29 .39 13 .48
30 2.8 1.5 e5.3 1.1 --- 19 16 2.1 .25 .32 7.1 .56
31 3.5 --- e4.5 1.1 --- 14 --- 1.9 --- .27 2.4 ---
TOTAL 189.53 188.1 382.1 55.7 183.09 136.6 608.6 342.7 32.07 78.87 36.80 20.80
MEAN 6.11 6.27 12.3 1.80 6.54 4.41 20.3 11.1 1.07 2.54 1.19 .69
MAX 114 88 93 3.7 94 19 71 34 4.6 16 13 1.8
MIN .10 1.5 4.3 1.1 .87 1.5 7.2 1.9 .25 .20 .18 .31
CFSM 2.08 2.13 4.19 .61 2.22 1.50 6.90 3.76 .36 .87 .40 .24
IN. 2.40 2.38 4.83 .70 2.32 1.73 7.70 4.34 .41 1.00 .47 .26
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1963 - 1997, BY WATER YEAR (WY)
MEAN 3.54 5.43 4.56 3.52 3.50 8.14 15.4 7.92 2.73 1.55 1.27 1.06
MAX 13.6 14.5 18.1 16.7 21.0 21.4 32.8 14.8 15.8 9.80 13.4 7.66
(WY) 1978 1996 1974 1996 1981 1979 1969 1971 1973 1996 1990 1981
MIN .093 .33 .77 .22 .16 1.42 2.44 2.36 .42 .079 .029 .048
(WY) 1965 1972 1989 1989 1980 1980 1995 1977 1985 1964 1965 1963
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1963 - 1997
ANNUAL TOTAL 3030.67 2254.96
ANNUAL MEAN 8.28 6.18 4.89
HIGHEST ANNUAL MEAN 8.13 1996
LOWEST ANNUAL MEAN 2.13 1965
HIGHEST DAILY MEAN 152 Jan 19 114 Oct 21 270 Jun 30 1973
LOWEST DAILY MEAN .08 Sep 7 a .10 Oct 1 .01 Aug 10 1963
ANNUAL SEVEN-DAY MINIMUM .09 Sep 1 .12 Oct 1 .01 Sep 19 1963
INSTANTANEOUS PEAK FLOW 276 Oct 21 b 1120 Jun 30 1973
INSTANTANEOUS PEAK STAGE 3.59 Oct 21 6.36 Jun 30 1973
INSTANTANEOUS LOW FLOW c .09 Oct 3 d
ANNUAL RUNOFF (CFSM) 2.82 2.10 1.66
ANNUAL RUNOFF (INCHES) 38.35 28.53 22.61
10 PERCENT EXCEEDS 22 15 12
50 PERCENT EXCEEDS 2.8 1.9 1.6
90 PERCENT EXCEEDS .11 .30 .15
a Also occurred October 2.
b From rating curve extended above 320 ft³/s.
c Also occurred on October 4.
d 0.01 ft³/s several days in 1963-65, 1971, 1975, 1977, 1978.
e Estimated.
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