MERRIMACK RIVER BASIN
01089100 SOUCOOK RIVER AT PEMBROKE ROAD NEAR CONCORD, NH
LOCATION.--Lat 43°12'47", long 71°28'49", Merrimack County, Hydrologic Unit 01070002, on left bank, 100 ft upstream of
Pembroke Road bridge, 500 ft east of U.S. Highway 106, 1.4 mi downstream from U.S. Highways 4, 202, and 9.
DRAINAGE AREA.--81.9 mi².
PERIOD OF RECORD.--Discharge records: March 1988 to current year. October 1951 to September 1987, at site 0.9 mi
upstream (station 01089000).
GAGE.--Water-stage recorder and crest-stage gage. Elevation of gage is 270 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 700 ft³/s and maximum (*):
Discharge Gage height Discharge Gage height
Date Time (ft³/s) (ft) Date Time (ft³/s) (ft)
Oct. 22 0530 * 1,750 * 10.46 Mar. 31 0915 952 8.45
Dec. 3 0430 1,060 8.78 Apr. 8 0900 725 7.70
Dec. 25 2015 778 7.89 Apr. 20 0030 1,310 9.45
Minimum discharge, 8.6 ft³/s, September 26-29.
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 14 120 146 238 108 316 599 227 75 16 12 22
2 12 115 493 247 101 283 445 216 78 15 12 23
3 12 104 847 241 94 316 402 196 75 23 12 18
4 11 94 465 227 90 272 420 217 68 68 11 16
5 10 87 336 223 104 241 485 200 62 42 12 15
6 10 82 275 259 119 331 544 187 57 30 12 13
7 10 80 249 235 106 e280 592 234 52 25 11 13
8 11 89 e235 e200 97 e240 669 213 49 21 11 15
9 26 110 271 e170 e90 e220 492 190 45 28 10 14
10 37 171 e230 e160 e88 e200 363 189 42 64 9.9 14
11 32 154 210 e155 e85 197 309 193 39 51 9.7 13
12 25 130 204 e140 79 e170 273 178 39 38 11 17
13 21 113 265 137 e78 e160 307 163 39 31 15 17
14 20 100 263 127 e81 e145 330 152 37 27 23 17
15 20 89 266 120 81 e170 291 144 33 35 17 17
16 18 e85 269 143 77 e178 264 198 30 55 14 15
17 18 e80 351 240 74 e160 251 216 28 42 13 12
18 16 79 648 e205 73 139 327 195 28 36 13 11
19 16 80 565 e150 80 142 989 182 41 31 11 10
20 64 84 661 e130 109 129 1090 239 43 26 11 10
21 962 82 467 e125 118 127 628 221 36 23 12 9.5
22 1440 79 351 127 262 139 435 185 33 22 15 9.2
23 624 75 287 139 508 139 349 161 29 18 15 9.2
24 373 72 271 e135 380 134 295 139 25 19 14 9.2
25 271 69 624 134 e270 128 259 130 24 19 13 9.1
26 210 120 523 e160 e240 249 235 125 22 17 12 9.2
27 174 245 372 e150 242 328 208 111 20 17 12 8.8
28 156 e186 300 130 339 338 240 96 18 16 14 8.8
29 142 e155 284 e120 --- 429 349 87 17 15 30 9.6
30 122 135 384 111 --- 590 269 80 16 13 36 10
31 120 --- 301 108 --- 844 --- 76 --- 13 26 ---
TOTAL 4997 3264 11413 5186 4173 7734 12709 5340 1200 896 449.6 394.6
MEAN 161 109 368 167 149 249 424 172 40.0 28.9 14.5 13.2
MAX 1440 245 847 259 508 844 1090 239 78 68 36 23
MIN 10 69 146 108 73 127 208 76 16 13 9.7 8.8
CFSM 1.97 1.33 4.50 2.04 1.82 3.05 5.17 2.10 .49 .35 .18 .16
IN. 2.27 1.48 5.18 2.36 1.90 3.51 5.77 2.43 .55 .41 .20 .18
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1988 - 1997, BY WATER YEAR (WY)
MEAN 93.9 150 160 141 123 197 285 176 67.7 38.4 38.3 32.1
MAX 168 289 368 420 350 278 429 333 154 101 95.4 91.3
(WY) 1992 1996 1997 1996 1996 1990 1993 1996 1989 1996 1990 1991
MIN 19.7 30.6 56.9 35.8 34.6 134 126 74.1 31.1 11.6 14.5 8.33
(WY) 1995 1995 1990 1989 1993 1992 1995 1993 1991 1993 1997 1995
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1988 - 1997
ANNUAL TOTAL 77513 57756.2
ANNUAL MEAN 212 158 125
HIGHEST ANNUAL MEAN 198 1996
LOWEST ANNUAL MEAN 86.8 1995
HIGHEST DAILY MEAN 2020 Apr 17 1440 Oct 22 2020 Apr 17 1996
LOWEST DAILY MEAN 10 Sep 7 a 8.8 Sep 27 6.4 Sep 15 1995
ANNUAL SEVEN-DAY MINIMUM 11 Oct 2 9.1 Sep 22 6.7 Sep 10 1995
INSTANTANEOUS PEAK FLOW 1750 Oct 22 b 3700 Mar 14 1977
INSTANTANEOUS PEAK STAGE 10.46 Oct 22 b 14.50 Mar 14 1977
INSTANTANEOUS LOW FLOW c 8.6 Sep 26 b 1.5 Aug 7 1965
ANNUAL RUNOFF (CFSM) 2.59 1.93 1.53
ANNUAL RUNOFF (INCHES) 35.21 26.23 20.82
10 PERCENT EXCEEDS 465 350 280
50 PERCENT EXCEEDS 130 108 76
90 PERCENT EXCEEDS 13 12 16
a Also occurred on September 28.
b At site located 0.9 mi upstream (station 01089000).
c Also occurred on September 27-29.
e Estimated.
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