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 1994-2002. | |
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, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 13 | 19 | 21 | 6.4 | 6.3 | 13 | 10 | 19 | 9.1 | 3.1 | 1.9 | 4.0 |
| 2 | 9.6 | 15 | 15 | 4.9 | 7.5 | 15 | 12 | 21 | 7.4 | 2.8 | 1.7 | 4.5 |
| 3 | 9.3 | 13 | 12 | 4.7 | 7.2 | 14 | 10 | 16 | 10 | 2.5 | 1.7 | 5.9 |
| 4 | 14 | 11 | 11 | e4.7 | 5.2 | 12 | 8.8 | 15 | 135 | 3.2 | 6.9 | 4.9 |
| 5 | 41 | 9.5 | 9.9 | 4.6 | 3.8 | 13 | 8.2 | 10 | 157 | 2.6 | 19 | 3.2 |
| 6 | 22 | 9.5 | 9.2 | e4.4 | 3.7 | 14 | 7.4 | 8.8 | 88 | 1.7 | 9.9 | 2.3 |
| 7 | 17 | 9.1 | 8.6 | e4.3 | e3.9 | 18 | 14 | 9.9 | 62 | 1.9 | 6.7 | 2.0 |
| 8 | 14 | 8.5 | 7.4 | e4.2 | e4.1 | 71 | 45 | 10 | 48 | 1.6 | 4.9 | 1.8 |
| 9 | 12 | 8.3 | 6.5 | 4.2 | 7.8 | 118 | 99 | 16 | 38 | 173 | 3.7 | 2.0 |
| 10 | 14 | 7.9 | 6.2 | 4.3 | 27 | 73 | 63 | 9.1 | 32 | 63 | 2.2 | 2.0 |
| 11 | 15 | 7.4 | 6.2 | e4.1 | 27 | 54 | 47 | 51 | 27 | 36 | 1.8 | 3.2 |
| 12 | 28 | 6.7 | 7.6 | e4.1 | 21 | 46 | 36 | 208 | 23 | 27 | 1.7 | 2.9 |
| 13 | 159 | 6.6 | 26 | 4.0 | 18 | 38 | 27 | 127 | 24 | 19 | 38 | 2.0 |
| 14 | 289 | 10 | 19 | 4.0 | 15 | 28 | 22 | 81 | 35 | 14 | 69 | 1.5 |
| 15 | 178 | 9.8 | 15 | 3.8 | 14 | 21 | 18 | 64 | 26 | 9.4 | 36 | 1.4 |
| 16 | 102 | 9.4 | 14 | e3.8 | 13 | 17 | 15 | 89 | 21 | 7.1 | 30 | 1.6 |
| 17 | 64 | 7.9 | 17 | e3.8 | 12 | 14 | 13 | 90 | 18 | 4.9 | 23 | 1.4 |
| 18 | 52 | 7.1 | 16 | e3.8 | 11 | 12 | 11 | 60 | 14 | 3.9 | 18 | 1.7 |
| 19 | 44 | 7.4 | 16 | e3.7 | 17 | 12 | 11 | 47 | 14 | 3.6 | 12 | 3.6 |
| 20 | 35 | 7.0 | 15 | e3.7 | 70 | 11 | 20 | 37 | 13 | 3.2 | 6.3 | 8.4 |
| 21 | 26 | 7.0 | 13 | 3.9 | 58 | 9.5 | 16 | 31 | 11 | 3.8 | 4.8 | 8.2 |
| 22 | 25 | 6.0 | 14 | 3.7 | 41 | 8.0 | 16 | 26 | 8.4 | 3.1 | 61 | 10 |
| 23 | 109 | 4.4 | 20 | 6.8 | 32 | 7.7 | 14 | 23 | 8.1 | 2.2 | 46 | 7.4 |
| 24 | 111 | 14 | 16 | 5.8 | 24 | 7.2 | 17 | 22 | 7.4 | 2.3 | 32 | 4.2 |
| 25 | 95 | 21 | 13 | 4.5 | 20 | 6.5 | 15 | 23 | 6.4 | 2.1 | 25 | 2.5 |
| 26 | 67 | 16 | 12 | e4.5 | 18 | 6.9 | 12 | 19 | 6.7 | 2.0 | 21 | 2.0 |
| 27 | 48 | 14 | 12 | e4.5 | 16 | 6.3 | 21 | 14 | 5.8 | 4.4 | 16 | 1.6 |
| 28 | 38 | 11 | 11 | 4.6 | 15 | 6.4 | 31 | 14 | 5.7 | 6.2 | 12 | 1.5 |
| 29 | 30 | 12 | 9.1 | 4.3 | --- | 18 | 23 | 14 | 4.8 | 14 | 6.8 | 1.8 |
| 30 | 24 | 24 | 8.3 | 6.6 | --- | 15 | 19 | 13 | 3.9 | 4.9 | 4.0 | 3.1 |
| 31 | 23 | --- | 7.4 | 6.2 | --- | 11 | --- | 12 | --- | 3.5 | 3.7 | --- |
| TOTAL | 1727.9 | 319.5 | 394.4 | 140.9 | 518.5 | 716.5 | 681.4 | 1199.8 | 869.7 | 432.0 | 526.7 | 102.6 |
| MEAN | 55.74 | 10.65 | 12.72 | 4.545 | 18.52 | 23.11 | 22.71 | 38.70 | 28.99 | 13.94 | 16.99 | 3.420 |
| MAX | 289 | 24 | 26 | 6.8 | 70 | 118 | 99 | 208 | 157 | 173 | 69 | 10 |
| MIN | 9.3 | 4.4 | 6.2 | 3.7 | 3.7 | 6.3 | 7.4 | 8.8 | 3.9 | 1.6 | 1.7 | 1.4 |
| CFSM | 3.08 | 0.59 | 0.70 | 0.25 | 1.02 | 1.28 | 1.25 | 2.14 | 1.60 | 0.77 | 0.94 | 0.19 |
| IN. | 3.55 | 0.66 | 0.81 | 0.29 | 1.07 | 1.47 | 1.40 | 2.47 | 1.79 | 0.89 | 1.08 | 0.21 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1986 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 11.78 | 15.01 | 12.71 | 14.06 | 20.50 | 21.64 | 25.51 | 21.77 | 19.56 | 12.86 | 11.85 | 8.453 |
| MAX | 55.7 | 36.0 | 40.5 | 36.9 | 57.6 | 44.4 | 62.9 | 46.1 | 48.3 | 80.8 | 82.1 | 29.1 |
| (WY) | 2002 | 1996 | 1988 | 1993 | 1997 | 1990 | 1993 | 1990 | 1996 | 1996 | 1987 | 1987 |
| MIN | 2.37 | 0.90 | 2.19 | 1.83 | 5.63 | 4.13 | 6.09 | 3.99 | 2.01 | 3.12 | 1.51 | 1.52 |
| (WY) | 1993 | 2000 | 1998 | 2000 | 1987 | 2000 | 1989 | 1989 | 1992 | 1991 | 1986 | 1988 |
| SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1986 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 7754.34 | 7629.9 | ||||
| ANNUAL MEAN | 21.24 | 20.90 | 16.55 | |||
| HIGHEST ANNUAL MEAN | 24.0 | 1993 | ||||
| LOWEST ANNUAL MEAN | 9.10 | 2000 | ||||
| HIGHEST DAILY MEAN | 289 | Oct 14 | 289 | Oct 14 | 1210 | Jul 18 1996 |
| LOWEST DAILY MEAN | 0.91 | Aug 15 | 1.4 | Sep 15,17 | 0.04 | Sep 9 1988 |
| ANNUAL SEVEN-DAY MINIMUM | 1.2 | Jul 14 | 1.8 | Sep 12 | 0.09 | Sep 3 1999 |
| MAXIMUM PEAK FLOW | 446 | Oct 13 | 1980 | Jul 18 1996 | ||
| MAXIMUM PEAK STAGE | 7.28 | Oct 13 | 9.24 | Jul 18 1996 | ||
| INSTANTANEOUS LOW FLOW | 1.2 | Aug 13 | 0.02 | A | ||
| ANNUAL RUNOFF (CFSM) | 1.17 | 1.15 | 0.91 | |||
| ANNUAL RUNOFF (INCHES) | 15.94 | 15.68 | 12.42 | |||
| 10 PERCENT EXCEEDS | 49 | 47 | 38 | |||
| 50 PERCENT EXCEEDS | 11 | 12 | 8.0 | |||
| 90 PERCENT EXCEEDS | 2.3 | 3.2 | 1.3 | |||