LOCATION.-- Lat 41°50'07", long 88°10'58" (NAD of 1927), in SW1/4SW1/4 sec.26, T.39 N., R.9 E., Du Page County, Hydrologic Unit 07120004, on right bank on upstream side of footbridge in Roy C. Blackwell Forest Preserve, 0.7 mi upstream from the confluence with the West Branch Du Page River and 1 mi northwest of Warrenville. | |
DRAINAGE AREA.-- 6.83 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1991 to current year. | |
STAGE: December 1993 to February 1994, April 1994 to current year. | |
GAGE.-- Water-stage recorder and crest-stage gage. Datum of gage is 690.15 ft above NGVD of 1929. | |
REMARKS.-- Effluent from sewage-treatment plant 3 mi upstream. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 393 ft3/s, July 18, 1996, gage height, 12.60 ft; no flow, Nov. 25, 1999. | |
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 | 12 | 18 | 19 | 10 | 13 | 14 | 16 | 21 | 8.9 | 8.5 | 7.4 | 8.2 |
| 2 | 11 | 17 | 16 | e9.8 | 12 | 14 | 19 | 22 | 7.6 | 8.0 | 6.3 | 9.7 |
| 3 | 12 | 15 | 15 | e9.4 | 11 | 16 | 16 | 19 | 9.1 | 7.5 | 5.8 | 11 |
| 4 | 14 | 14 | 14 | 10 | 11 | 14 | 14 | 17 | 60 | 6.8 | 6.8 | 8.6 |
| 5 | 59 | 15 | 13 | 10 | 9.4 | 12 | 14 | 16 | 36 | 6.5 | 21 | 7.2 |
| 6 | 26 | 15 | 13 | 10 | 9.2 | 13 | 13 | 16 | 25 | 6.9 | 11 | 6.7 |
| 7 | 21 | 14 | 13 | 10 | 9.4 | 20 | 17 | 15 | 21 | 6.7 | 7.5 | 7.0 |
| 8 | 18 | 13 | 13 | 10 | 11 | 47 | 43 | 14 | 19 | 6.7 | 6.5 | 7.0 |
| 9 | 16 | 11 | 12 | 9.9 | 13 | 75 | 62 | 20 | 17 | 88 | 5.3 | 8.6 |
| 10 | 15 | 11 | 12 | 9.7 | 25 | 41 | 33 | 16 | 19 | 22 | 5.8 | 8.0 |
| 11 | 17 | 10 | 12 | 9.3 | 22 | 33 | 30 | 47 | 26 | 17 | 6.0 | 8.3 |
| 12 | 26 | 11 | 12 | 9.5 | 20 | 28 | 26 | 126 | 17 | 14 | 6.4 | 7.8 |
| 13 | 128 | 10 | 22 | 9.8 | 17 | 25 | 24 | 40 | 14 | 11 | 23 | 7.6 |
| 14 | 224 | 17 | 16 | 10 | 15 | 24 | 23 | 27 | 23 | 9.8 | 26 | 7.6 |
| 15 | 59 | 17 | 14 | 10 | 15 | 23 | 21 | 24 | 18 | 8.2 | 15 | 7.6 |
| 16 | 41 | 12 | 13 | 9.6 | 14 | 23 | 19 | 42 | 14 | 7.8 | 11 | 8.1 |
| 17 | 31 | 9.7 | 15 | 9.9 | 13 | 23 | 18 | 36 | 13 | 7.8 | 9.4 | 8.0 |
| 18 | 30 | 10 | 14 | 9.6 | 13 | 20 | 17 | 31 | 12 | 7.2 | 8.2 | 11 |
| 19 | 26 | 18 | 14 | 9.5 | 18 | 17 | 16 | 27 | 11 | 7.9 | 9.7 | 11 |
| 20 | 22 | 14 | 14 | 9.4 | 38 | 16 | 30 | 22 | 8.6 | 7.6 | 9.3 | 15 |
| 21 | 21 | 11 | 13 | 9.7 | 28 | 14 | 27 | 19 | 10 | 7.0 | 7.6 | 14 |
| 22 | 19 | 11 | 13 | 9.6 | 24 | 13 | 24 | 17 | 10 | 7.1 | 51 | 12 |
| 23 | 62 | 13 | 14 | 9.8 | 22 | 13 | 20 | 16 | 9.2 | 6.8 | 25 | 12 |
| 24 | 53 | e15 | 13 | 10 | 20 | 12 | 21 | 15 | 7.4 | 6.3 | 19 | 10 |
| 25 | 48 | e22 | 12 | 9.5 | 18 | 11 | 25 | 16 | 15 | 6.7 | 16 | 11 |
| 26 | 40 | e18 | 12 | 8.8 | 17 | 11 | 19 | 14 | 19 | 7.0 | 13 | e6.6 |
| 27 | 32 | e15 | 12 | 9.1 | 16 | 11 | 26 | 13 | 13 | 9.8 | 11 | e6.2 |
| 28 | 31 | e14 | 12 | 9.4 | 15 | 11 | 37 | 12 | 10 | 8.9 | 9.7 | e5.8 |
| 29 | 27 | e17 | 11 | 8.8 | --- | 19 | 26 | 11 | 7.8 | 9.3 | 8.5 | e7.0 |
| 30 | 24 | 21 | 11 | 8.8 | --- | 22 | 23 | 10 | 7.4 | 8.1 | 8.0 | e7.2 |
| 31 | 20 | --- | 10 | 11 | --- | 16 | --- | 9.7 | --- | 7.3 | 8.0 | --- |
| TOTAL | 1185 | 428.7 | 419 | 299.9 | 469.0 | 651 | 719 | 750.7 | 488.0 | 350.2 | 384.2 | 265.8 |
| MEAN | 38.23 | 14.29 | 13.52 | 9.674 | 16.75 | 21.00 | 23.97 | 24.22 | 16.27 | 11.30 | 12.39 | 8.860 |
| MAX | 224 | 22 | 22 | 11 | 38 | 75 | 62 | 126 | 60 | 88 | 51 | 15 |
| MIN | 11 | 9.7 | 10 | 8.8 | 9.2 | 11 | 13 | 9.7 | 7.4 | 6.3 | 5.3 | 5.8 |
| CFSM | 5.60 | 2.09 | 1.98 | 1.42 | 2.45 | 3.07 | 3.51 | 3.55 | 2.38 | 1.65 | 1.81 | 1.30 |
| IN. | 6.45 | 2.33 | 2.28 | 1.63 | 2.55 | 3.55 | 3.92 | 4.09 | 2.66 | 1.91 | 2.09 | 1.45 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1992 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 13.96 | 14.21 | 12.10 | 15.82 | 16.98 | 18.24 | 23.34 | 18.00 | 18.18 | 12.25 | 11.90 | 11.31 |
| MAX | 38.2 | 20.9 | 17.9 | 29.5 | 35.4 | 28.5 | 34.4 | 26.7 | 30.2 | 29.6 | 17.4 | 19.3 |
| (WY) | 2002 | 1995 | 1993 | 1993 | 1997 | 1998 | 1993 | 1996 | 1993 | 1996 | 1997 | 2001 |
| MIN | 7.35 | 6.49 | 7.72 | 8.92 | 7.37 | 10.1 | 8.35 | 6.98 | 7.41 | 8.44 | 7.33 | 6.60 |
| (WY) | 1995 | 1994 | 1994 | 1994 | 1996 | 2000 | 1994 | 1994 | 1992 | 1995 | 1999 | 1995 |
| SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1992 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 6777.8 | 6410.5 | ||||
| ANNUAL MEAN | 18.57 | 17.56 | 15.50 | |||
| HIGHEST ANNUAL MEAN | 18.8 | 1993 | ||||
| LOWEST ANNUAL MEAN | 11.3 | 1994 | ||||
| HIGHEST DAILY MEAN | 224 | Oct 14 | 224 | Oct 14 | 309 | Jul 18 1996 |
| LOWEST DAILY MEAN | 4.6 | Aug 12 | 5.3 | Aug 9 | 3.8 | Nov 25 1999 |
| ANNUAL SEVEN-DAY MINIMUM | 6.0 | Jul 11 | 6.9 | Jul 20 | 4.6 | Nov 5 1993 |
| MAXIMUM PEAK FLOW | 364 | Oct 13 | 393 | Jul 18 1996 | ||
| MAXIMUM PEAK STAGE | 12.34 | Oct 13 | 12.60 | Jul 18 1996 | ||
| INSTANTANEOUS LOW FLOW | 4.3 | A | 0.00 | Nov 25 1999 | ||
| ANNUAL RUNOFF (CFSM) | 2.72 | 2.57 | 2.27 | |||
| ANNUAL RUNOFF (INCHES) | 36.92 | 34.92 | 30.83 | |||
| 10 PERCENT EXCEEDS | 30 | 27 | 28 | |||
| 50 PERCENT EXCEEDS | 15 | 13 | 11 | |||
| 90 PERCENT EXCEEDS | 7.9 | 7.6 | 6.6 | |||