LOCATION.-- Lat 41°49'54", long 88°02'51" (NAD of 1927), 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 1961-76. |
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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. 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; minimum discharge, 3.6 ft3/s, Dec. 19, 1989. |
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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 |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 19 | 22 | 33 | 29 | 23 | 46 | 75 | 34 | e230 | e27 | e33 | 32 |
2 | 19 | 41 | 30 | 28 | 23 | 50 | 58 | 31 | e150 | e28 | e32 | 28 |
3 | 23 | 149 | 29 | 28 | 25 | 43 | 50 | 30 | e110 | e35 | e35 | 26 |
4 | 22 | 132 | 34 | 28 | 23 | 64 | 43 | 28 | e75 | e54 | e90 | 25 |
5 | 20 | 242 | 61 | 30 | 23 | 308 | 41 | 27 | e60 | e35 | e60 | 25 |
6 | 19 | 107 | 48 | 27 | 22 | 214 | 39 | 27 | e50 | e48 | e40 | 25 |
7 | 19 | 60 | 41 | 27 | 23 | 120 | 38 | 28 | e42 | e59 | e30 | 23 |
8 | 18 | 45 | 37 | 26 | 23 | 83 | 37 | 28 | e36 | e34 | e25 | 22 |
9 | 19 | 37 | 44 | 26 | 24 | 66 | 34 | 26 | e33 | e45 | e24 | 22 |
10 | 18 | 33 | 222 | 25 | 23 | 53 | 32 | 26 | e100 | e74 | e23 | 22 |
11 | 18 | 32 | 179 | 26 | 22 | 47 | 31 | 27 | 202 | e49 | e22 | 21 |
12 | 18 | 30 | 103 | 27 | 23 | 41 | 31 | 29 | 329 | e50 | e22 | 21 |
13 | 18 | 26 | 64 | 26 | 22 | 38 | 30 | 40 | 218 | e38 | 21 | 21 |
14 | 71 | 25 | 52 | 26 | 24 | 48 | 29 | 133 | e130 | e31 | 21 | 20 |
15 | 50 | 26 | 45 | 24 | 23 | 41 | 28 | 128 | e150 | e28 | 21 | 23 |
16 | 38 | 26 | 42 | 25 | 22 | 39 | 28 | 68 | e70 | e24 | 22 | 28 |
17 | 32 | 26 | 37 | 28 | 23 | 39 | 28 | 48 | e56 | e21 | 27 | 23 |
18 | 29 | 217 | 35 | 27 | 22 | 42 | 27 | 59 | e46 | e22 | 27 | 22 |
19 | 26 | 175 | 33 | 25 | 24 | 44 | 27 | 52 | e40 | e22 | 31 | 21 |
20 | 25 | 94 | 32 | 25 | 55 | 52 | 32 | 47 | e35 | e22 | 27 | 19 |
21 | 24 | 64 | 31 | 24 | 64 | 46 | 46 | 70 | e50 | e28 | 27 | 22 |
22 | 23 | 52 | 32 | 23 | 54 | 42 | 39 | 119 | e68 | e30 | 23 | 21 |
23 | 22 | 68 | 31 | 23 | 63 | 37 | 33 | 118 | e52 | e29 | 22 | 20 |
24 | 22 | 98 | 30 | 23 | 65 | 63 | 34 | 76 | e44 | e28 | 62 | 20 |
25 | 41 | 66 | 28 | 23 | 55 | 65 | 66 | 63 | e38 | e26 | 53 | 20 |
26 | 29 | 52 | 27 | 23 | 47 | 162 | 48 | 51 | e35 | e25 | 59 | 19 |
27 | 26 | 46 | 27 | 24 | 42 | 114 | 36 | 42 | e29 | e23 | 50 | 19 |
28 | 25 | 41 | 37 | 23 | 40 | 136 | 33 | 35 | e31 | e21 | 163 | 19 |
29 | 24 | 37 | 35 | 23 | 38 | 279 | 29 | 32 | e29 | e21 | 76 | 19 |
30 | 23 | 35 | 32 | 22 | --- | 175 | 32 | 85 | e27 | e23 | 48 | 19 |
31 | 23 | --- | 30 | 22 | --- | 104 | --- | e250 | --- | e34 | 38 | --- |
TOTAL | 803 | 2104 | 1541 | 786 | 960 | 2701 | 1134 | 1857 | 2565 | 1034 | 1254 | 667 |
MEAN | 25.9 | 70.1 | 49.7 | 25.4 | 33.1 | 87.1 | 37.8 | 59.9 | 85.5 | 33.4 | 40.5 | 22.2 |
MAX | 71 | 242 | 222 | 30 | 65 | 308 | 75 | 250 | 329 | 74 | 163 | 32 |
MIN | 18 | 22 | 27 | 22 | 22 | 37 | 27 | 26 | 27 | 21 | 21 | 19 |
CFSM | 0.97 | 2.64 | 1.87 | 0.95 | 1.24 | 3.28 | 1.42 | 2.25 | 3.21 | 1.25 | 1.52 | 0.84 |
IN. | 1.12 | 2.94 | 2.16 | 1.10 | 1.34 | 3.78 | 1.59 | 2.60 | 3.59 | 1.45 | 1.75 | 0.93 |
e Estimated |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2004, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 41.0 | 47.8 | 37.6 | 44.2 | 52.7 | 57.5 | 69.7 | 70.9 | 58.1 | 38.8 | 41.2 | 34.6 |
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 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1990 - 2004 | |||
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ANNUAL TOTAL | 16751 | 17406 | ||||
ANNUAL MEAN | 45.9 | 47.6 | 49.5 | |||
HIGHEST ANNUAL MEAN | 64.1 | 1993 | ||||
LOWEST ANNUAL MEAN | 38.5 | 1994 | ||||
HIGHEST DAILY MEAN | 472 | May 1 | 329 | Jun 12 | 961 | Oct 14 2001 |
LOWEST DAILY MEAN | 18 | A | 18 | B | 11 | C |
ANNUAL SEVEN-DAY MINIMUM | 18 | Jan 14 | 18 | Oct 7 | 12 | Aug 14 1992 |
MAXIMUM PEAK FLOW | 372 | Nov 4 | 1040 | Oct 14 2001 | ||
MAXIMUM PEAK STAGE | 13.14 | Nov 4 | 16.28 | Oct 14 2001 | ||
INSTANTANEOUS LOW FLOW | 12 | Oct 13 | 3.6 | Dec 19 1989 | ||
ANNUAL RUNOFF (CFSM) | 1.73 | 1.79 | 1.86 | |||
ANNUAL RUNOFF (INCHES) | 23.43 | 24.34 | 25.27 | |||
10 PERCENT EXCEEDS | 81 | 86 | 91 | |||
50 PERCENT EXCEEDS | 29 | 32 | 32 | |||
90 PERCENT EXCEEDS | 20 | 22 | 19 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |