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 1994-2002. |
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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. |
DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 33 | 39 | 50 | 25 | 40 | 34 | 51 | 46 | 29 | 24 | 22 | 23 |
2 | 30 | 36 | 42 | 25 | 36 | 43 | 59 | 51 | 28 | 23 | 23 | 53 |
3 | 28 | 33 | 37 | 24 | 34 | 49 | 49 | 45 | 30 | 22 | 20 | 36 |
4 | 47 | 30 | 35 | 25 | 31 | 44 | 42 | 40 | 241 | 22 | 28 | 28 |
5 | 167 | 29 | 32 | 25 | 27 | 38 | 38 | 36 | 339 | 22 | 54 | 25 |
6 | 88 | 28 | 30 | 25 | 27 | 49 | 35 | 38 | 175 | 21 | 32 | 24 |
7 | 52 | 28 | 28 | 24 | 29 | 68 | 54 | 34 | 94 | 22 | 25 | 25 |
8 | 41 | 28 | 26 | 24 | 33 | 165 | 131 | 33 | 62 | 23 | 22 | 23 |
9 | 39 | 32 | 26 | 24 | 47 | 327 | 253 | 50 | 48 | 244 | 21 | 22 |
10 | 38 | 29 | 25 | 24 | 79 | 245 | 155 | 38 | 59 | 153 | 20 | 23 |
11 | 42 | 26 | 23 | 24 | 72 | 135 | 92 | 139 | 95 | 77 | 20 | 22 |
12 | 81 | 25 | 31 | 24 | 60 | 91 | 66 | 450 | 59 | 47 | 21 | 21 |
13 | 368 | 25 | 62 | 24 | 51 | 71 | 55 | 347 | 48 | 36 | 72 | 21 |
14 | 961 | 33 | 53 | 24 | 47 | 61 | 54 | 160 | 80 | 32 | 127 | 20 |
15 | 634 | 30 | 45 | 24 | 48 | 55 | 47 | 89 | 62 | 29 | 78 | 20 |
16 | 259 | 27 | 44 | 24 | 41 | 50 | 42 | 138 | 44 | 26 | 49 | 20 |
17 | 127 | 28 | 51 | 24 | 37 | 46 | 44 | 177 | 39 | 25 | 34 | 23 |
18 | 84 | 28 | 44 | 23 | 35 | 43 | 38 | 104 | 34 | 24 | 29 | 32 |
19 | 64 | 34 | 46 | 24 | 56 | 42 | 38 | 74 | 31 | 22 | 33 | 28 |
20 | 51 | 28 | 45 | 23 | 114 | 38 | 74 | 61 | 29 | 22 | 27 | 41 |
21 | 46 | 27 | 41 | 23 | 108 | 35 | 67 | 51 | 27 | 20 | 24 | 37 |
22 | 43 | 25 | 43 | 24 | 79 | 34 | 59 | 45 | 26 | 21 | 282 | 38 |
23 | 194 | 24 | 45 | 26 | 64 | 32 | 47 | 43 | 29 | 21 | 297 | 30 |
24 | 248 | 36 | 40 | 26 | 54 | 30 | 58 | 42 | 28 | 21 | 147 | 25 |
25 | 232 | 55 | 35 | 26 | 47 | 30 | 64 | 45 | 55 | 20 | 71 | 22 |
26 | 131 | 41 | 33 | 25 | 42 | 30 | 47 | 44 | 40 | 21 | 48 | 21 |
27 | 78 | 36 | 32 | 25 | 40 | 29 | 66 | 40 | 30 | 29 | 38 | 20 |
28 | 60 | 33 | 30 | 25 | 37 | 28 | 104 | 37 | 26 | 25 | 34 | 18 |
29 | 52 | 38 | 29 | 25 | --- | 61 | 69 | 34 | 25 | 30 | 30 | 22 |
30 | 45 | 59 | 28 | 25 | --- | 69 | 56 | 32 | 24 | 27 | 26 | 22 |
31 | 43 | --- | 27 | 33 | --- | 54 | --- | 29 | --- | 24 | 24 | --- |
TOTAL | 4406 | 970 | 1158 | 766 | 1415 | 2126 | 2054 | 2592 | 1936 | 1175 | 1778 | 785 |
MEAN | 142.1 | 32.33 | 37.35 | 24.71 | 50.54 | 68.58 | 68.47 | 83.61 | 64.53 | 37.90 | 57.35 | 26.17 |
MAX | 961 | 59 | 62 | 33 | 114 | 327 | 253 | 450 | 339 | 244 | 297 | 53 |
MIN | 28 | 24 | 23 | 23 | 27 | 28 | 35 | 29 | 24 | 20 | 20 | 18 |
CFSM | 5.34 | 1.22 | 1.40 | 0.93 | 1.90 | 2.58 | 2.57 | 3.14 | 2.43 | 1.42 | 2.16 | 0.98 |
IN. | 6.16 | 1.36 | 1.62 | 1.07 | 1.98 | 2.97 | 2.87 | 3.62 | 2.71 | 1.64 | 2.49 | 1.10 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1990 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 43.29 | 48.12 | 37.63 | 47.61 | 56.54 | 57.21 | 73.89 | 67.72 | 57.98 | 38.38 | 40.58 | 36.22 |
MAX | 142 | 92.8 | 56.2 | 100 | 138 | 87.8 | 139 | 121 | 97.2 | 96.5 | 63.4 | 83.3 |
(WY) | 2002 | 1991 | 1991 | 1993 | 1997 | 1993 | 1993 | 1990 | 1993 | 1996 | 1998 | 2001 |
MIN | 18.5 | 20.5 | 16.3 | 24.6 | 28.9 | 29.9 | 33.3 | 22.2 | 21.5 | 19.9 | 18.4 | 19.7 |
(WY) | 1990 | 2000 | 1990 | 2000 | 1996 | 1996 | 1990 | 1992 | 1992 | 1991 | 1991 | 1995 |
SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1990 - 2002 | |||
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ANNUAL TOTAL | 21556 | 21161 | ||||
ANNUAL MEAN | 59.06 | 57.98 | 50.34 | |||
HIGHEST ANNUAL MEAN | 64.1 | 1993 | ||||
LOWEST ANNUAL MEAN | 38.5 | 1994 | ||||
HIGHEST DAILY MEAN | 961 | Oct 14 | 961 | Oct 14 | 961 | Oct 14 2001 |
LOWEST DAILY MEAN | 19 | Jul 15 | 18 | Sep 28 | 11 | A |
ANNUAL SEVEN-DAY MINIMUM | 20 | Jul 11 | 21 | Jul 20 | 12 | Aug 14 1992 |
MAXIMUM PEAK FLOW | 1040 | Oct 14 | 1040 | Oct 14 2001 | ||
MAXIMUM PEAK STAGE | 16.28 | Oct 14 | 16.28 | Oct 14 2001 | ||
INSTANTANEOUS LOW FLOW | 13 | B | 3.6 | Dec 19 1989 | ||
ANNUAL RUNOFF (CFSM) | 2.22 | 2.18 | 1.89 | |||
ANNUAL RUNOFF (INCHES) | 30.15 | 29.59 | 25.72 | |||
10 PERCENT EXCEEDS | 103 | 99 | 94 | |||
50 PERCENT EXCEEDS | 38 | 36 | 32 | |||
90 PERCENT EXCEEDS | 24 | 23 | 19 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |