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 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 2.3 | 1.5 | 0.53 | 0.64 | e0.66 | e0.47 | 2.3 | 169 | 7.9 | 1.4 | 11 | 2.0 |
| 2 | 8.4 | 1.9 | 0.59 | e0.63 | e0.80 | e0.48 | 2.3 | 127 | 5.0 | 1.2 | 6.0 | 2.0 |
| 3 | 6.6 | 2.1 | 0.56 | e0.61 | e0.90 | e0.49 | 5.6 | 71 | 8.6 | 1.3 | 8.5 | 1.3 |
| 4 | 15 | 2.7 | e0.54 | e0.60 | e0.85 | e0.49 | 32 | 62 | 5.4 | 1.5 | 14 | 0.90 |
| 5 | 11 | 3.7 | e0.51 | e0.64 | e0.78 | e0.49 | 33 | 133 | 5.1 | 6.6 | 11 | 0.82 |
| 6 | 6.5 | 2.8 | e0.50 | e0.64 | e0.54 | e0.48 | 21 | 79 | 3.9 | 9.8 | 6.6 | 0.75 |
| 7 | 4.1 | 2.6 | e0.50 | e0.62 | e0.52 | e0.48 | 18 | 56 | 4.6 | 8.0 | 4.4 | 0.71 |
| 8 | 2.9 | 2.5 | e0.49 | e0.60 | e0.52 | e0.49 | 15 | 47 | 17 | 9.3 | 3.5 | 0.71 |
| 9 | 1.7 | 2.4 | e0.51 | e0.59 | e0.53 | e0.52 | 14 | 145 | 15 | 9.9 | 2.5 | 0.71 |
| 10 | 1.2 | 2.2 | 0.51 | e0.58 | e0.54 | e0.54 | 14 | 123 | 9.4 | 7.4 | 2.1 | 0.71 |
| 11 | 0.96 | 2.9 | e0.47 | e0.58 | e0.52 | e0.56 | 10 | 85 | 8.3 | 4.5 | 2.0 | 0.71 |
| 12 | 1.0 | 3.9 | e0.46 | e0.59 | e0.52 | e0.50 | 8.4 | 60 | 7.4 | 2.6 | 1.9 | 0.71 |
| 13 | 1.3 | 3.0 | e0.46 | e0.60 | e0.51 | 9.2 | 7.2 | 49 | 5.8 | 2.4 | 1.9 | 0.71 |
| 14 | 2.1 | 2.7 | e0.45 | e0.56 | e0.49 | 5.4 | 6.1 | 43 | 4.1 | 2.0 | 1.5 | 4.6 |
| 15 | 1.5 | 3.4 | e0.48 | e0.54 | e0.47 | 3.9 | 5.5 | 37 | 4.1 | 20 | 1.4 | 2.1 |
| 16 | 1.8 | 3.9 | e0.53 | e0.54 | e0.50 | 3.4 | 5.2 | 30 | 2.9 | 8.7 | 1.9 | 1.3 |
| 17 | 2.2 | 3.3 | 0.60 | e0.54 | e0.51 | 3.1 | 4.6 | 25 | 3.3 | 17 | 2.0 | 0.57 |
| 18 | 2.9 | 3.2 | e4.8 | e0.53 | e0.50 | 2.5 | 3.3 | 20 | 4.1 | 32 | 1.3 | 0.37 |
| 19 | 2.0 | 4.7 | e4.0 | e0.50 | e0.50 | 3.6 | 3.4 | 18 | 7.3 | 14 | 1.1 | 0.35 |
| 20 | 1.6 | 3.1 | e2.5 | e0.46 | e0.49 | 6.6 | 3.3 | 16 | 4.6 | 11 | 1.0 | 0.35 |
| 21 | 1.5 | 2.1 | e1.2 | e0.45 | e0.49 | 5.0 | 2.5 | 12 | 3.8 | 21 | 0.91 | 0.35 |
| 22 | 1.4 | 1.1 | e0.90 | e0.50 | e0.50 | 2.7 | 2.9 | 11 | 2.8 | 16 | 0.85 | 0.50 |
| 23 | 1.8 | 0.86 | e0.80 | e0.54 | e0.52 | 2.5 | 2.3 | 10 | 2.6 | 12 | 0.82 | 0.58 |
| 24 | 1.7 | 0.77 | e0.74 | e0.54 | e0.52 | 1.8 | 2.8 | 9.3 | 2.6 | 7.7 | 0.82 | 0.66 |
| 25 | 3.5 | 0.68 | e0.70 | e0.56 | e0.54 | 3.0 | 2.1 | 6.0 | 2.3 | 4.8 | 0.82 | 0.39 |
| 26 | 3.0 | e0.56 | e0.66 | e0.58 | e0.54 | 2.7 | 1.9 | 6.4 | 3.4 | 2.6 | 0.94 | 2.1 |
| 27 | 2.8 | e0.55 | e0.65 | e0.58 | e0.50 | 1.9 | 2.1 | 5.4 | 3.2 | 1.7 | 0.83 | 2.1 |
| 28 | 1.9 | e0.54 | e0.62 | e0.56 | e0.46 | 5.4 | 1.9 | 7.2 | 2.2 | 4.9 | 0.82 | 1.8 |
| 29 | 1.8 | e0.54 | e0.64 | e0.56 | --- | 7.0 | 1.7 | 7.0 | 2.1 | 6.2 | 0.83 | 0.96 |
| 30 | 1.5 | e0.56 | e0.66 | e0.60 | --- | 4.6 | 33 | 11 | 2.3 | 4.0 | 0.82 | 0.51 |
| 31 | 1.5 | --- | e0.67 | e0.64 | --- | 2.9 | --- | 14 | --- | 4.2 | 0.84 | --- |
| TOTAL | 99.46 | 66.76 | 28.23 | 17.70 | 15.72 | 83.19 | 267.4 | 1494.3 | 161.1 | 255.7 | 94.90 | 32.33 |
| MEAN | 3.21 | 2.23 | 0.91 | 0.57 | 0.56 | 2.68 | 8.91 | 48.2 | 5.37 | 8.25 | 3.06 | 1.08 |
| MAX | 15 | 4.7 | 4.8 | 0.64 | 0.90 | 9.2 | 33 | 169 | 17 | 32 | 14 | 4.6 |
| MIN | 0.96 | 0.54 | 0.45 | 0.45 | 0.46 | 0.47 | 1.7 | 5.4 | 2.1 | 1.2 | 0.82 | 0.35 |
| CFSM | 0.18 | 0.12 | 0.05 | 0.03 | 0.03 | 0.15 | 0.49 | 2.66 | 0.30 | 0.46 | 0.17 | 0.06 |
| IN. | 0.20 | 0.14 | 0.06 | 0.04 | 0.03 | 0.17 | 0.55 | 3.07 | 0.33 | 0.53 | 0.20 | 0.07 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2003, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 11.3 | 14.3 | 12.1 | 13.3 | 19.4 | 20.6 | 24.6 | 23.2 | 18.8 | 12.6 | 11.4 | 8.04 |
| 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 | 2.37 | 0.90 | 0.91 | 0.57 | 0.56 | 2.68 | 6.09 | 3.99 | 2.01 | 3.12 | 1.51 | 1.08 |
| (WY) | 1993 | 2000 | 2003 | 2003 | 2003 | 2003 | 1989 | 1989 | 1992 | 1991 | 1986 | 2003 |
| SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1986 - 2003 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 5382.55 | 2616.79 | ||||
| ANNUAL MEAN | 14.7 | 7.17 | 16.0 | |||
| HIGHEST ANNUAL MEAN | 24.0 | 1993 | ||||
| LOWEST ANNUAL MEAN | 7.17 | 2003 | ||||
| HIGHEST DAILY MEAN | 208 | May 12 | 169 | May 1 | 1210 | Jul 18 1996 |
| LOWEST DAILY MEAN | 0.45 A | Dec 14 | 0.35 | Sep 19-21 | 0.04 | Sep 9 1988 |
| ANNUAL SEVEN-DAY MINIMUM | 0.48 | Dec 9 | 0.44 | Sep 17 | 0.09 | Sep 3 1999 |
| MAXIMUM PEAK FLOW | 195 | May 1 | 1980 | Jul 18 1996 | ||
| MAXIMUM PEAK STAGE | 5.99 | May 1 | 9.24 | Jul 18 1996 | ||
| INSTANTANEOUS LOW FLOW | 0.35 | B | 0.02 | C | ||
| ANNUAL RUNOFF (CFSM) | 0.81 | 0.40 | 0.88 | |||
| ANNUAL RUNOFF (INCHES) | 11.06 | 5.38 | 12.01 | |||
| 10 PERCENT EXCEEDS | 36 | 14 | 37 | |||
| 50 PERCENT EXCEEDS | 6.2 | 2.0 | 7.5 | |||
| 90 PERCENT EXCEEDS | 0.98 | 0.50 | 1.1 | |||