MERRIMACK RIVER BASIN
010965852 BEAVER BROOK AT NORTH PELHAM, NH
LOCATION.--Lat 42°46'59", long 71°21'14", Rockingham County, Hydrologic Unit 01070002, on right bank, 10 ft downstream
from highway bridge at the Windham-Pelham town line, 0.7 mi north of North Pelham, 1.3 mi south of West Windham
(junction of State Routes 128 and 111), and 4.7 mi north of Pelham (revised).
DRAINAGE AREA.--47.8 mi².
PERIOD OF RECORD.--Discharge records: October 1986 to current year.
GAGE.--Water-stage recorder. Elevation of gage is 170 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 400 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 22 0030 * 1,580 * 12.94 Apr. 20 0400 648 9.89
Dec. 20 2100 416 8.84
Minimum discharge, 1.8 ft³/s, September 22, 23.
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 12 111 104 e129 75 104 277 159 45 7.4 2.3 3.6
2 10 101 175 e121 70 101 268 141 43 6.8 2.2 3.6
3 12 92 250 114 e66 103 247 130 39 10 2.4 3.4
4 10 83 226 113 e62 93 260 149 39 14 3.0 3.0
5 8.9 80 182 118 100 86 291 136 34 11 3.6 2.8
6 8.2 77 151 132 148 135 280 124 31 8.4 3.0 2.5
7 8.4 72 141 124 e135 164 253 118 28 7.5 2.5 2.4
8 14 71 e160 e103 108 144 218 101 26 7.3 2.2 2.3
9 61 84 206 e95 e91 123 189 92 24 9.8 2.5 2.4
10 59 104 200 100 e83 110 159 96 22 32 5.1 2.6
11 51 94 175 113 e73 106 138 92 20 20 4.1 2.7
12 38 92 164 e99 67 98 126 84 18 14 3.4 3.7
13 30 79 178 e91 e58 86 154 78 24 11 5.3 4.6
14 24 72 186 79 e69 78 174 80 26 9.4 13 4.2
15 22 64 201 70 e73 106 143 75 20 9.8 8.0 3.3
16 19 e61 213 92 e68 e117 125 73 16 9.4 6.2 3.4
17 19 e59 257 e150 e61 e98 108 71 15 8.5 4.4 2.6
18 17 57 368 e130 e58 91 153 68 17 7.6 3.5 2.2
19 16 57 380 e84 78 85 440 67 46 7.1 2.8 2.1
20 121 59 405 e73 143 82 607 191 30 6.0 2.8 2.0
21 1010 57 354 e68 145 87 425 188 23 5.9 4.3 2.0
22 1440 54 269 e64 205 107 287 145 20 5.3 15 1.9
23 923 51 219 70 220 117 217 112 16 4.5 11 2.0
24 501 49 192 64 177 102 180 90 13 4.8 7.2 2.1
25 318 48 218 105 135 91 154 89 14 4.4 5.0 2.0
26 231 99 212 e170 109 188 139 89 12 4.1 3.9 2.0
27 184 157 188 e145 109 246 123 76 12 4.1 3.5 2.0
28 159 137 166 115 113 215 141 67 11 4.1 3.4 2.0
29 152 117 154 e113 --- 190 198 58 9.2 3.4 4.3 2.8
30 144 99 152 e96 --- 212 181 51 8.1 2.9 4.7 3.0
31 128 --- 134 82 --- 230 --- 48 --- 2.6 4.0 ---
TOTAL 5750.5 2437 6580 3222 2899 3895 6655 3138 701.3 263.1 148.6 81.2
MEAN 186 81.2 212 104 104 126 222 101 23.4 8.49 4.79 2.71
MAX 1440 157 405 170 220 246 607 191 46 32 15 4.6
MIN 8.2 48 104 64 58 78 108 48 8.1 2.6 2.2 1.9
CFSM 3.88 1.70 4.44 2.17 2.17 2.63 4.64 2.12 .49 .18 .10 .06
IN. 4.48 1.90 5.12 2.51 2.26 3.03 5.18 2.44 .55 .20 .12 .06
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 1997, BY WATER YEAR (WY)
MEAN 54.7 85.8 111 89.5 88.0 142 177 95.8 37.0 19.5 24.3 23.3
MAX 186 148 228 223 181 281 406 145 81.9 48.4 80.1 86.5
(WY) 1997 1996 1987 1996 1996 1994 1987 1989 1989 1988 1991 1991
MIN 11.9 19.3 27.8 27.5 41.4 56.5 66.0 46.2 16.6 3.53 2.24 2.71
(WY) 1994 1995 1990 1989 1987 1989 1995 1995 1995 1993 1993 1997
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1987 - 1997
ANNUAL TOTAL 44279.6 35770.7
ANNUAL MEAN 121 98.0 78.8
HIGHEST ANNUAL MEAN 99.9 1996
LOWEST ANNUAL MEAN 54.6 1995
HIGHEST DAILY MEAN 1440 Oct 22 1440 Oct 22 1500 Apr 6 1987
LOWEST DAILY MEAN 1.9 Aug 31 1.9 Sep 22 1.2 Aug 27 1987
ANNUAL SEVEN-DAY MINIMUM 2.3 Aug 27 2.0 Sep 20 1.3 Sep 4 1995
INSTANTANEOUS PEAK FLOW 1580 Oct 22 1850 Apr 6 1987
INSTANTANEOUS PEAK STAGE 12.94 Oct 22 12.94 Oct 22 1996
INSTANTANEOUS LOW FLOW a 1.8 Sep 22 1.1 Sep 4 1995
ANNUAL RUNOFF (CFSM) 2.53 2.05 1.65
ANNUAL RUNOFF (INCHES) 34.46 27.84 22.41
10 PERCENT EXCEEDS 258 208 171
50 PERCENT EXCEEDS 81 76 53
90 PERCENT EXCEEDS 8.2 3.4 7.3
a Also occurred on September 23.
e Estimated.
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