MERRIMACK RIVER BASIN
01081000 WINNIPESAUKEE RIVER AT TILTON, NH
LOCATION.--Lat 43°26'31", long 71°35'20", Belknap County, Hydrologic Unit 01070002, on right bank, at Tilton and 0.3 mi
upstream from Packer Brook.
DRAINAGE AREA.--471 mi².
PERIOD OF RECORD.--Discharge records: January 1937 to current year.
Water-quality records: Water year 1953.
REVISED RECORDS.--WSP 1901: 1960.
GAGE.--Water-stage recorder. Datum of gage is 441.87 ft above sea level.
REMARKS.--Records good except for estimated daily discharges which are fair. Flow regulated by powerplants prior to
1967 and by Winnipesaukee (station 01080000), Winnisquam 4.5 mi upstream, Wentworth, Merrymeeting (Reservoirs in
Merrimack River basin), and other lakes upstream.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 2,510 ft³/s, April 19, gage height 6.45 ft; minimum daily discharge,
49 ft³/s, October 18.
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
1 223 893 901 1790 1060 1630 1330 1820 306 236 483 244
2 220 939 1330 1730 1130 1510 1210 1810 313 236 466 262
3 219 945 1510 1620 1130 1400 1130 1790 352 252 465 316
4 215 929 1280 1600 1130 1350 1150 1780 498 261 464 317
5 216 922 1220 1610 1160 1250 1210 1670 508 253 464 316
6 216 910 1280 1620 1230 1180 1260 1240 505 243 463 316
7 216 928 1260 1610 1180 1160 1300 1280 501 239 460 317
8 221 968 1250 1610 1070 1140 1330 1350 500 239 460 325
9 238 1050 1250 1590 1060 1130 1220 1250 515 249 460 328
10 257 1100 1250 1550 1060 1170 1120 1070 503 279 459 319
11 250 1050 1320 1540 1060 1260 1080 1050 493 267 466 311
12 240 1010 1330 1500 1060 1260 1070 1030 490 254 397 320
13 233 1010 1350 1380 1060 1240 1110 1020 451 246 251 324
14 225 999 1360 1180 1070 1200 1130 1010 351 252 232 322
15 119 990 1350 1180 1100 1080 1110 932 336 434 223 315
16 e84 981 1350 1340 1100 1070 1080 906 329 604 221 324
17 e54 974 1390 1550 1100 1060 1080 891 298 641 220 325
18 e49 974 1550 1530 1100 1060 1280 839 250 740 218 299
19 e58 929 1750 1450 1100 1060 2150 814 284 754 216 233
20 287 840 1790 1340 1130 1060 2250 823 280 842 210 226
21 1120 834 1720 1420 1130 1060 1940 767 266 841 233 222
22 1530 1090 1650 1420 1190 1070 1790 584 257 836 253 220
23 1220 983 1620 1420 1260 1070 1800 552 255 869 248 220
24 1070 952 1540 1380 1250 1060 1790 548 250 937 244 220
25 854 951 1530 1390 1190 1060 1780 545 250 938 241 219
26 555 945 1600 1380 1160 1110 1760 543 250 936 240 219
27 517 903 1740 1360 1220 1170 1770 539 247 934 247 219
28 640 866 1720 1350 1450 1190 1840 466 244 931 252 219
29 894 850 1730 1340 --- 1230 1920 289 239 925 256 225
30 913 842 1850 1260 --- 1300 1880 261 237 845 249 220
31 901 --- 1880 1050 --- 1420 --- 260 --- 644 244 ---
TOTAL 14054 28557 45651 45090 31940 37010 43870 29729 10558 17157 10005 8262
MEAN 453 952 1473 1455 1141 1194 1462 959 352 553 323 275
MAX 1530 1100 1880 1790 1450 1630 2250 1820 515 938 483 328
MIN 49 834 901 1050 1060 1060 1070 260 237 236 210 219
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1937 - 1997, BY WATER YEAR (WY)
MEAN 427 523 733 849 933 960 1151 986 700 450 409 407
MAX 1257 1304 2209 1855 1889 2043 2745 2605 2821 1767 897 954
(WY) 1978 1976 1984 1952 1958 1983 1953 1954 1984 1973 1986 1938
MIN 219 235 136 145 158 418 420 217 201 179 181 182
(WY) 1958 1972 1942 1942 1942 1989 1948 1957 1957 1957 1957 1957
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1937 - 1997
ANNUAL TOTAL 397348 321883
ANNUAL MEAN 1086 882 706
HIGHEST ANNUAL MEAN 1229 1984
LOWEST ANNUAL MEAN 304 1965
HIGHEST DAILY MEAN 3560 May 12 2250 Apr 20 4480 May 31 1984
LOWEST DAILY MEAN e 49 Oct 18 e 49 Oct 18 48 Aug 31 1941
ANNUAL SEVEN-DAY MINIMUM 117 Oct 13 117 Oct 13 73 Oct 11 1995
INSTANTANEOUS PEAK FLOW 2510 Apr 19 4580 May 31 1984
INSTANTANEOUS PEAK STAGE 6.45 Apr 19 8.68 May 31 1984
10 PERCENT EXCEEDS 2110 1600 1430
50 PERCENT EXCEEDS 993 951 535
90 PERCENT EXCEEDS 222 236 267
e Estimated.
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