LOCATION.-- Lat 41°51'23", long 88°12'15" (NAD of 1927), in NW1/4NW1/4 sec.22, T.39 N., R.9 E., Du Page County, Hydrologic Unit 07120004, on left downstream side of bridge at intersection of Wilson Street and Joliet Road, 0.5 mi south of West Chicago, and at mile 0.5. | |
DRAINAGE AREA.-- 18.1 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: November 1985 to current year. | |
STAGE: Water years 1994 to current year. | |
PARTIAL RECORD: Annual maximum, water years 1961-80. | |
PRECIPITATION: April 1986 to current year. | |
REVISED RECORDS.-- WDR IL-77-1: 1961-76(M). | |
GAGE.-- Water-stage recorder, phone telemeter, rain gage, and crest-stage gage. Datum of gage is 700.00 ft above NGVD of 1929. Prior to November 8, 1985 at datum 5.44 ft higher. | |
REMARKS.-- Collection, computation and publication of precipitation data do not necessarily conform to standards used by the National Weather Service. Precipitation data could be subject to error for days with freezing and/or thawing of precipitation. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,980 ft3/s, July 18, 1996, gage height, 9.24 ft; minimum discharge, .02 ft3/s, Sept. 1, 2, 9, 1988. | |
PRECIPITATION: Maximum daily total, 6.88 in., July 17, 1996, but may have been greater during periods of missing record. | |
REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. | |
| Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 0.42 | 0.53 | 4.7 | 3.3 | e1.6 | 14 | 39 | 6.8 | 72 | 3.4 | 0.76 | 2.2 |
| 2 | 0.39 | 5.9 | 3.6 | 3.1 | e1.6 | 17 | 32 | 7.1 | 57 | 2.5 | 0.77 | 1.1 |
| 3 | 0.63 | 38 | 3.9 | 2.9 | 1.6 | 14 | 27 | 4.6 | 49 | 7.6 | 4.9 | 0.85 |
| 4 | 0.69 | 32 | 4.5 | 3.3 | 1.6 | 20 | 22 | 4.2 | 36 | 7.9 | 24 | 1.1 |
| 5 | 1.0 | 62 | 9.4 | 3.4 | e1.5 | 120 | 19 | 3.2 | 25 | 5.2 | 13 | 0.59 |
| 6 | 0.67 | 28 | 8.8 | 3.0 | e1.6 | 76 | 18 | 3.7 | 20 | 4.3 | 5.9 | 0.49 |
| 7 | 0.46 | 17 | 6.6 | 2.6 | e1.6 | 55 | 16 | 2.9 | 16 | 3.3 | 2.7 | 0.44 |
| 8 | 0.38 | 12 | 4.9 | 2.4 | 1.6 | 40 | 14 | 4.2 | 12 | 3.2 | 1.2 | 0.31 |
| 9 | 0.47 | 9.6 | 12 | e2.3 | 1.5 | 31 | 12 | 2.8 | 9.4 | 12 | 1.2 | 0.31 |
| 10 | 0.36 | 7.6 | 110 | 2.3 | 1.5 | 25 | 11 | 3.7 | 18 | 15 | 0.92 | 0.31 |
| 11 | 0.35 | 5.6 | 83 | 2.4 | 1.4 | 21 | 10 | 4.8 | 36 | 8.1 | 0.90 | 0.43 |
| 12 | 0.35 | 4.7 | 45 | 2.6 | 1.5 | 17 | 9.4 | 6.1 | 134 | 5.1 | 0.71 | 0.32 |
| 13 | 0.35 | 4.7 | 33 | e2.5 | 1.6 | 14 | 8.5 | 17 | 72 | 3.7 | 0.66 | 0.31 |
| 14 | 12 | 4.0 | 24 | e2.4 | 1.6 | 16 | 6.0 | 59 | 58 | 2.5 | 0.66 | 0.31 |
| 15 | 5.9 | 2.8 | 19 | e2.3 | 1.5 | 11 | 6.4 | 47 | 47 | 2.3 | 0.69 | 0.44 |
| 16 | 3.1 | 3.5 | 16 | e2.4 | 1.5 | 9.8 | 5.1 | 31 | 36 | 2.7 | 0.82 | 0.76 |
| 17 | 2.6 | 3.2 | 13 | e2.6 | 1.5 | 9.5 | 6.2 | 22 | 29 | 2.2 | 1.2 | 1.5 |
| 18 | 1.8 | 65 | 10 | e2.6 | 1.6 | 11 | 4.8 | 29 | 20 | 2.3 | 1.4 | 0.38 |
| 19 | 1.2 | 48 | 8.1 | e2.3 | 1.9 | 11 | 5.2 | 21 | 16 | 1.9 | 1.9 | 0.33 |
| 20 | 0.94 | 26 | 6.5 | e2.2 | 13 | 18 | 10 | 20 | 13 | 1.3 | 2.8 | 0.72 |
| 21 | 0.78 | 20 | 4.9 | e2.1 | 16 | 11 | 20 | 26 | 21 | 1.1 | 1.1 | 0.52 |
| 22 | 0.77 | 17 | 3.9 | e2.0 | 12 | 8.3 | 21 | 59 | 18 | 4.4 | 0.66 | 1.2 |
| 23 | 0.93 | 21 | e4.0 | e1.9 | 18 | 8.2 | 14 | 51 | 14 | 4.3 | 0.66 | 0.55 |
| 24 | 0.92 | 26 | e3.8 | e1.8 | 17 | 20 | 10 | 35 | 13 | 3.5 | 4.4 | 0.33 |
| 25 | 2.1 | 17 | e3.5 | e1.7 | 13 | 21 | 19 | 33 | 10 | 3.0 | 2.4 | 0.31 |
| 26 | 1.6 | 15 | e3.3 | e1.6 | 17 | 55 | 13 | 28 | 8.1 | 2.4 | 2.8 | 0.31 |
| 27 | 1.3 | 12 | e3.3 | e1.7 | 10 | 42 | 9.3 | 22 | 6.7 | 1.6 | 4.8 | 0.31 |
| 28 | 0.79 | 9.7 | e5.0 | e1.7 | 8.8 | 62 | 8.8 | 17 | 5.6 | 0.96 | 41 | 0.31 |
| 29 | 0.70 | 6.3 | e4.7 | e1.5 | 6.9 | 108 | 5.6 | 11 | 4.7 | 0.83 | 18 | 0.37 |
| 30 | 0.75 | 4.8 | e4.0 | e1.6 | --- | 66 | 6.5 | 75 | 4.2 | 0.80 | 8.9 | 0.33 |
| 31 | 0.61 | --- | 3.8 | e1.6 | --- | 49 | --- | 111 | --- | 0.76 | 5.0 | --- |
| TOTAL | 45.31 | 528.93 | 470.2 | 72.1 | 161.5 | 1000.8 | 408.8 | 768.1 | 880.7 | 120.15 | 156.81 | 17.74 |
| MEAN | 1.46 | 17.6 | 15.2 | 2.33 | 5.57 | 32.3 | 13.6 | 24.8 | 29.4 | 3.88 | 5.06 | 0.59 |
| MAX | 12 | 65 | 110 | 3.4 | 18 | 120 | 39 | 111 | 134 | 15 | 41 | 2.2 |
| MIN | 0.35 | 0.53 | 3.3 | 1.5 | 1.4 | 8.2 | 4.8 | 2.8 | 4.2 | 0.76 | 0.66 | 0.31 |
| CFSM | 0.08 | 0.97 | 0.84 | 0.13 | 0.31 | 1.78 | 0.75 | 1.37 | 1.62 | 0.21 | 0.28 | 0.03 |
| IN. | 0.09 | 1.09 | 0.97 | 0.15 | 0.33 | 2.06 | 0.84 | 1.58 | 1.81 | 0.25 | 0.32 | 0.04 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2004, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 10.7 | 14.4 | 12.2 | 12.7 | 18.7 | 21.2 | 24.0 | 23.3 | 19.3 | 12.1 | 11.0 | 7.65 |
| MAX | 55.7 | 36.0 | 40.5 | 36.9 | 57.6 | 44.4 | 62.9 | 48.2 | 48.3 | 80.8 | 82.1 | 29.1 |
| (WY) | 2002 | 1996 | 1988 | 1993 | 1997 | 1990 | 1993 | 2003 | 1996 | 1996 | 1987 | 1987 |
| MIN | 1.46 | 0.90 | 0.91 | 0.57 | 0.56 | 2.68 | 6.09 | 3.99 | 2.01 | 3.12 | 1.51 | 0.59 |
| (WY) | 2004 | 2000 | 2003 | 2003 | 2003 | 2003 | 1989 | 1989 | 1992 | 1991 | 1986 | 2004 |
| SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1986 - 2004 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 3466.78 | 4631.14 | ||||
| ANNUAL MEAN | 9.50 | 12.7 | 15.8 | |||
| HIGHEST ANNUAL MEAN | 24.0 | 1993 | ||||
| LOWEST ANNUAL MEAN | 7.17 | 2003 | ||||
| HIGHEST DAILY MEAN | 169 | May 1 | 134 | Jun 12 | 1210 | Jul 18 1996 |
| LOWEST DAILY MEAN | 0.35 | A | 0.31 | A | 0.04 | Sep 9 1988 |
| ANNUAL SEVEN-DAY MINIMUM | 0.39 | Oct 7 | 0.32 | Sep 24 | 0.09 | Sep 3 1999 |
| MAXIMUM PEAK FLOW | 160 | Jun 12 | 1980 | Jul 18 1996 | ||
| MAXIMUM PEAK STAGE | 5.67 | Jun 12 | 9.24 | Jul 18 1996 | ||
| INSTANTANEOUS LOW FLOW | 0.27 | Sep 10,28 | 0.02 | B | ||
| ANNUAL RUNOFF (CFSM) | 0.525 | 0.699 | 0.874 | |||
| ANNUAL RUNOFF (INCHES) | 7.13 | 9.52 | 11.87 | |||
| 10 PERCENT EXCEEDS | 21 | 34 | 37 | |||
| 50 PERCENT EXCEEDS | 2.8 | 4.7 | 7.4 | |||
| 90 PERCENT EXCEEDS | 0.50 | 0.66 | 1.0 | |||