LOCATION.-- Lat 41°49'54", long 88°02'52" (NAD of 1983), in SE1/4SW1/4 sec.25, T.39 N., R.10 E., Du Page County, Hydrologic Unit 07120004, on upstream side of bridge on State Highway 56, 2.2 mi northwest of Downers Grove, and at mile 15.0. |
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DRAINAGE AREA.-- 26.6 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1989 to current year. |
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STAGE: Water years 1994 to current year. |
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PARTIAL RECORD: Annual maximum, water years 1955; 1961; 1963-76. |
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GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 660.00 ft above NGVD of 1929 (659.73 ft NAVD 1988). Prior to July 19, 1989, at datum 12.21 ft higher. |
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REMARKS.-- Diurnal fluctuation at low flow caused by sewage-treatment plants upstream from station. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,720 ft3/s, Aug. 26, 1972, gage height, 16.94 ft, present datum; minimum discharge, 3.6 ft3/s, Dec. 19, 1989. |
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REMARKS FOR CURRENT YEAR.-- Records good. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2004 TO SEPTEMBER 2005 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 23 | 79 | 84 | 29 | 25 | 57 | 66 | 29 | 26 | 26 | 25 | 24 |
2 | 36 | 96 | 65 | 62 | 26 | 49 | 138 | 28 | 27 | 25 | 24 | 23 |
3 | 24 | 52 | 53 | 70 | 27 | 45 | 91 | 26 | 27 | 23 | 25 | 22 |
4 | 22 | 82 | 47 | 67 | 28 | 44 | 67 | 25 | 40 | 25 | 24 | 21 |
5 | 20 | 54 | 43 | 55 | 41 | 45 | 52 | 24 | 41 | 26 | 24 | 22 |
6 | 19 | 39 | 56 | 51 | 55 | 40 | 45 | 26 | 34 | 26 | 24 | 22 |
7 | 18 | 31 | 160 | 41 | 95 | 41 | 42 | 35 | 30 | 25 | 22 | 21 |
8 | 49 | 26 | 132 | 37 | 101 | 37 | 37 | 28 | 28 | 25 | 23 | 21 |
9 | 36 | 24 | 85 | 35 | 73 | 33 | 35 | 27 | 24 | 25 | 22 | 21 |
10 | 30 | 22 | 62 | 34 | 56 | 35 | 35 | 26 | 26 | 24 | 26 | 22 |
11 | 25 | 20 | 54 | 46 | 47 | 38 | 34 | 39 | 27 | 24 | 28 | 22 |
12 | 22 | 20 | 48 | 209 | 43 | 35 | 87 | 36 | 26 | 24 | 33 | 21 |
13 | 22 | 19 | 41 | 487 | 66 | 33 | 100 | 25 | 28 | 26 | 31 | 21 |
14 | 21 | 19 | 35 | 307 | 184 | 32 | 70 | 25 | 29 | 26 | 28 | 25 |
15 | 24 | 20 | 34 | 152 | 135 | 30 | 52 | 26 | 28 | 26 | 26 | 25 |
16 | 23 | 24 | 32 | 88 | 117 | 30 | 45 | 27 | 26 | 27 | 24 | 35 |
17 | 20 | 21 | 30 | 61 | 81 | 29 | 41 | 27 | 24 | 27 | 23 | 26 |
18 | 19 | 21 | 31 | 46 | 64 | 29 | 38 | 26 | 24 | 27 | 30 | 25 |
19 | 19 | 40 | 26 | 43 | 53 | 34 | 35 | 126 | 25 | 26 | 32 | 28 |
20 | 19 | 33 | 25 | 37 | 61 | 32 | 33 | 79 | 25 | 36 | 130 | 26 |
21 | 20 | 28 | 24 | 34 | 66 | 30 | 31 | 50 | 24 | 39 | 66 | 24 |
22 | 20 | 26 | 23 | 35 | 56 | 29 | 57 | 41 | 24 | 34 | 43 | 25 |
23 | 59 | 25 | 23 | 32 | 51 | 29 | 56 | 35 | 24 | 32 | 34 | 24 |
24 | 42 | 30 | 22 | 31 | 46 | 27 | 46 | 31 | 25 | 31 | 30 | 28 |
25 | 31 | 42 | 21 | 31 | 43 | 47 | 41 | 30 | 25 | 48 | 27 | 26 |
26 | 26 | 41 | 21 | 31 | 41 | 42 | 36 | 29 | 25 | 90 | 27 | 26 |
27 | 24 | 113 | 21 | 28 | 40 | 36 | 33 | 28 | 27 | 77 | 26 | 25 |
28 | 21 | 110 | 22 | 27 | 69 | 33 | 30 | 28 | 26 | 42 | 25 | 36 |
29 | 26 | 70 | 21 | 28 | --- | 31 | 29 | 27 | 27 | 34 | 25 | 36 |
30 | 34 | 64 | 22 | 27 | --- | 43 | 30 | 27 | 29 | 33 | 24 | 27 |
31 | 29 | --- | 27 | 26 | --- | 69 | --- | 26 | --- | 28 | 25 | --- |
TOTAL | 823 | 1291 | 1390 | 2287 | 1790 | 1164 | 1532 | 1062 | 821 | 1007 | 976 | 750 |
MEAN | 26.5 | 43.0 | 44.8 | 73.8 | 63.9 | 37.5 | 51.1 | 34.3 | 27.4 | 32.5 | 31.5 | 25.0 |
MAX | 59 | 113 | 160 | 487 | 184 | 69 | 138 | 126 | 41 | 90 | 130 | 36 |
MIN | 18 | 19 | 21 | 26 | 25 | 27 | 29 | 24 | 24 | 23 | 22 | 21 |
CFSM | 1.00 | 1.62 | 1.69 | 2.77 | 2.40 | 1.41 | 1.92 | 1.29 | 1.03 | 1.22 | 1.18 | 0.94 |
IN. | 1.15 | 1.81 | 1.94 | 3.20 | 2.50 | 1.63 | 2.14 | 1.49 | 1.15 | 1.41 | 1.36 | 1.05 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2005, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 40.1 | 47.5 | 38.1 | 46.1 | 53.4 | 56.2 | 68.6 | 68.6 | 56.2 | 38.4 | 40.6 | 34.0 |
MAX | 142 | 92.8 | 56.2 | 100 | 138 | 87.8 | 139 | 123 | 97.2 | 96.5 | 63.4 | 83.3 |
(WY) | 2002 | 1991 | 1991 | 1993 | 1997 | 1993 | 1993 | 2003 | 1993 | 1996 | 1998 | 2001 |
MIN | 18.5 | 20.5 | 16.3 | 19.2 | 22.5 | 29.9 | 33.3 | 22.2 | 21.5 | 19.9 | 18.4 | 19.7 |
(WY) | 1990 | 2000 | 1990 | 2003 | 2003 | 1996 | 1990 | 1992 | 1992 | 1991 | 1991 | 1995 |
SUMMARY STATISTICS | FOR 2004 CALENDAR YEAR | FOR 2005 WATER YEAR | WATER YEARS 1990 - 2005 | |||
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ANNUAL TOTAL | 16462 | 14893 | ||||
ANNUAL MEAN | 45.0 | 40.8 | 48.9 | |||
HIGHEST ANNUAL MEAN | 64.1 | 1993 | ||||
LOWEST ANNUAL MEAN | 38.5 | 1994 | ||||
HIGHEST DAILY MEAN | 329 | Jun 12 | 487 | Jan 13 | 961 | Oct 14 2001 |
LOWEST DAILY MEAN | 18 | Oct 7 | 18 | Oct 7 | 11 | A |
ANNUAL SEVEN-DAY MINIMUM | 19 | Sep 24 | 20 | Oct 16 | 12 | Aug 14 1992 |
MAXIMUM PEAK FLOW | 517 | Jan 13 | 1040 | Oct 14 2001 | ||
MAXIMUM PEAK STAGE | 14.01 | Jan 13 | 16.28 | Oct 14 2001 | ||
INSTANTANEOUS LOW FLOW | 14 | B | 3.6 | Dec 19 1989 | ||
ANNUAL RUNOFF (CFSM) | 1.69 | 1.53 | 1.84 | |||
ANNUAL RUNOFF (INCHES) | 23.02 | 20.83 | 24.99 | |||
10 PERCENT EXCEEDS | 77 | 67 | 90 | |||
50 PERCENT EXCEEDS | 30 | 30 | 31 | |||
90 PERCENT EXCEEDS | 21 | 22 | 20 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |