DISCHARGE: June 1903 to July 1906, October 1906 to March 1909, July 1914 to September 1919, October 1939 to current year. Published as "below mouth of Pecatonica River at Rockton" 1903-9; as "at Rockford" 1914-19. Monthly discharge only for some periods for 1903-1950, published in WSP 1308. |
STAGE: Water years 1994-2001. |
CHEMICAL: Water years 1978-91. |
DISCHARGE, IN CUBIC FEET PER SECOND, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 4170 | 3490 | 3850 | e2860 | e3220 | 8840 | 7460 | 7610 | 6260 | 7470 | 2970 | 3490 |
2 | 3970 | 3320 | 3830 | e2940 | e3400 | 8650 | 7190 | 7390 | 6570 | 7430 | 3820 | 3310 |
3 | 3880 | 3160 | 3750 | e3000 | e3550 | 9150 | 7200 | 7520 | 6640 | 7170 | 4350 | 3170 |
4 | 4210 | 3080 | 3730 | e3000 | e3580 | 9280 | 7210 | 8320 | 6570 | 7010 | 4440 | 3340 |
5 | 4300 | 3050 | 3610 | e3000 | e3580 | 7900 | 7130 | 8950 | 6970 | 6760 | 4940 | 3490 |
6 | 3690 | 3160 | 3060 | e3000 | e3700 | 7280 | 7160 | 9200 | 7540 | 6520 | 4730 | 3180 |
7 | 3230 | 3810 | 3000 | e3100 | 4040 | 6890 | 7130 | 9060 | 7600 | 6300 | 4570 | 3410 |
8 | 3240 | 3770 | 3390 | e3250 | 4390 | 6600 | 6660 | 8660 | 7700 | 6140 | 4480 | 4330 |
9 | 3110 | 4340 | 3070 | e3350 | 6240 | 6350 | 7560 | 8270 | 7500 | 5990 | 3890 | 5060 |
10 | 3070 | 4630 | 3270 | e3450 | 7590 | 6180 | 8140 | 8200 | 7240 | 5590 | 3670 | 5580 |
11 | 2950 | 4680 | 2800 | e3280 | 7970 | 6390 | 8470 | 8750 | 6910 | 4940 | 3770 | 5820 |
12 | 2870 | 4580 | 2960 | e3260 | 8240 | 6920 | 9720 | 8770 | 7700 | 4680 | 3430 | 6050 |
13 | 2810 | 4440 | e3800 | e3260 | 8190 | 7530 | 10200 | 8120 | 8310 | 4630 | 3520 | 5880 |
14 | 2850 | 4400 | e3800 | e3280 | 8540 | 7870 | 10500 | 8050 | 7830 | 4250 | 3200 | 5570 |
15 | 2790 | 4300 | e3600 | e3300 | 8530 | 8370 | 10500 | 7920 | 8370 | 4040 | 2590 | 5250 |
16 | 2800 | 4300 | e3210 | e3280 | 8340 | 9250 | 10300 | 7590 | 8680 | 3740 | 3410 | 5020 |
17 | 3010 | 3960 | e3100 | e3270 | 7930 | 9270 | 9990 | 7220 | 8670 | 3440 | 3440 | 4870 |
18 | 3540 | 3860 | e3000 | e3270 | 7610 | 9380 | 9820 | 6900 | 8680 | 3430 | 3300 | 4820 |
19 | 3670 | 3920 | e3000 | e3270 | 7200 | 9480 | 9410 | 6590 | 8540 | 3520 | 3440 | 5310 |
20 | 3600 | 3930 | e2950 | e3300 | 6860 | 9560 | 9360 | 6290 | 8670 | 3530 | 3520 | 5690 |
21 | 3460 | 3850 | e2900 | e3400 | 6450 | 9740 | 9310 | 6420 | 8690 | 3640 | 3220 | 6340 |
22 | 3350 | 3880 | e2860 | e3490 | 6190 | 9600 | 9270 | 6930 | 8550 | 3640 | 3180 | 7050 |
23 | 3380 | 3910 | e2800 | e3500 | 5990 | 9490 | 9480 | 7190 | 8490 | 3580 | 3380 | 7440 |
24 | 3370 | 4000 | e2780 | e3450 | 6070 | 9330 | 9130 | 7420 | 8330 | 3370 | 3580 | 8070 |
25 | 3750 | 4080 | e2800 | e3400 | 8050 | 9180 | 9240 | 7430 | 8160 | 3490 | 3640 | 7790 |
26 | 3870 | 4150 | e2800 | e3380 | 8870 | 9040 | 9020 | 7370 | 8050 | 3550 | 3950 | 7370 |
27 | 3800 | 4100 | e2780 | e3300 | 8970 | 8880 | 8750 | 7140 | 7980 | 3660 | 4140 | 7380 |
28 | 3760 | 3900 | e2740 | e3250 | 9020 | 8630 | 8580 | 6960 | 8000 | 3560 | 4380 | 7310 |
29 | 3720 | 3850 | e2790 | e3250 | --- | 8060 | 8190 | 6780 | 7800 | 3150 | 4960 | 6990 |
30 | 3630 | 3820 | e2810 | e3220 | --- | 8000 | 7780 | 6470 | 7660 | 3500 | 4470 | 6430 |
31 | 3560 | --- | e2820 | e3180 | --- | 7740 | --- | 6260 | --- | 2800 | 3840 | --- |
TOTAL | 107410 | 117720 | 97660 | 100540 | 182310 | 258830 | 259860 | 235750 | 234660 | 144520 | 118220 | 164810 |
MEAN | 3465 | 3924 | 3150 | 3243 | 6511 | 8349 | 8662 | 7605 | 7822 | 4662 | 3814 | 5494 |
MAX | 4300 | 4680 | 3850 | 3500 | 9020 | 9740 | 10500 | 9200 | 8690 | 7470 | 4960 | 8070 |
MIN | 2790 | 3050 | 2740 | 2860 | 3220 | 6180 | 6660 | 6260 | 6260 | 2800 | 2590 | 3170 |
CFSM | .54 | .62 | .50 | .51 | 1.02 | 1.31 | 1.36 | 1.20 | 1.23 | .73 | .60 | .86 |
IN. | .63 | .69 | .57 | .59 | 1.07 | 1.51 | 1.52 | 1.38 | 1.37 | .84 | .69 | .96 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 2001, BY WATER YEAR (WY) | ||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
MEAN | 3088 | 3498 | 3260 | 3210 | 3887 | 7273 | 7365 | 5368 | 4523 | 3716 | 2899 | 2913 |
MAX | 13340 | 11320 | 9049 | 9432 | 8365 | 13920 | 18530 | 17770 | 16960 | 17000 | 9039 | 7753 |
(WY) | 1987 | 1986 | 1983 | 1960 | 1997 | 1974 | 1993 | 1973 | 2000 | 1993 | 1993 | 1972 |
MIN | 857 | 1100 | 1004 | 800 | 1000 | 1692 | 2476 | 1103 | 1248 | 1056 | 793 | 780 |
(WY) | 1965 | 1940 | 1959 | 1940 | 1940 | 1954 | 1958 | 1958 | 1977 | 1965 | 1958 | 1958 |
SUMMARY STATISTICS | FOR 2000 CALENDAR YEAR | FOR 2001 WATER YEAR | WATER YEARS 1940 - 2001 | |||
---|---|---|---|---|---|---|
ANNUAL TOTAL | 2006180 | 2022290 | ||||
ANNUAL MEAN | 5481 | 5541 | 4249 | |||
HIGHEST ANNUAL MEAN | 9484 | 1993 | ||||
LOWEST ANNUAL MEAN | 1568 | 1958 | ||||
HIGHEST DAILY MEAN | 22200 | Jun 14 | 10500 | Apr 14,15 | 29700 | Mar 25 1975 |
LOWEST DAILY MEAN | 2000 A | Feb 4 | 2590 | Aug 15 | 501 | Sep 14 1958 |
ANNUAL SEVEN-DAY MINIMUM | 2110 A | Jan 31 | 2780 A | Dec 23 | 622 | Oct 2 1958 |
MAXIMUM PEAK FLOW | 10700 | Apr 12 | 30000 | Mar 25 1975 | ||
MAXIMUM PEAK STAGE | 7.62 | Apr 12 | 15.54 | Mar 25 1975 | ||
INSTANTANEOUS LOW FLOW | 1900 | Aug 15 | ||||
ANNUAL RUNOFF (CFSM) | .86 | .87 | .67 | |||
ANNUAL RUNOFF (INCHES) | 11.73 | 11.82 | 9.07 | |||
10 PERCENT EXCEEDS | 10000 | 8800 | 8410 | |||
50 PERCENT EXCEEDS | 4020 | 4580 | 3210 | |||
90 PERCENT EXCEEDS | 2780 | 3070 | 1300 |
A - Estimated due to backwater from ice. |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |