LOCATION.-- Lat 40°28'16", long 89°01'48" (NAD of 1927), in NE1/4NW1/4 sec.7, T.23 N., R.2 E., McLean County, Hydrologic Unit 07130009, on left bank at Bloomington-Normal Sanitary District sewage-treatment plant, 250 ft upstream from bridge on Interstate 74, 0.4 mi west of Bloomington, and at mile 48.8. |
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DRAINAGE AREA.-- 34.4 mi2. |
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PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE |
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DISCHARGE: October 1974 to current year. |
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STAGE: Water years 1994 to current year. |
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REVISED RECORDS.-- WDR IL-82-2: Drainage area. WDR IL-87-2: 1985. |
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GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 725.11 ft above NGVD of 1929. Prior to Nov. 4, 1987, 200 ft upstream at same datum. |
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REMARKS.-- Sewage-treatment plant effluent 300 ft upstream contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. |
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EXTREMES FOR PERIOD OF RECORD.-- |
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SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 6,600 ft3/s, Dec. 3, 1982, gage height, 14.02 ft, from floodmark; minimum daily, 9.0 ft3/s, Dec. 25, 1976. |
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REMARKS FOR CURRENT YEAR.-- Records fair. Effluent from sewage-treatment plant upstream averaged 30.6 ft3/s and contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. The maximum monthly effluent was 38.2 ft3/s in July and the minimum was 26.5 ft3/s in December. |
Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003 DAILY MEAN VALUES |
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DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
1 | 20 | 17 | 19 | 25 | 50 | 24 | 32 | 46 | 24 | 40 | 33 | 465 |
2 | 19 | 15 | 20 | 26 | 42 | 23 | 32 | 35 | 27 | 34 | 143 | 128 |
3 | 20 | 16 | 19 | 27 | 61 | 23 | 32 | 32 | 42 | 32 | 98 | 77 |
4 | 67 | 16 | 18 | 24 | 38 | 26 | 222 | 108 | 27 | 29 | 44 | 59 |
5 | 24 | 43 | 19 | 27 | 33 | 35 | 106 | 102 | 24 | 28 | 34 | 49 |
6 | 18 | 21 | 19 | 26 | 28 | 33 | 69 | 65 | 55 | 27 | 33 | 41 |
7 | 17 | 18 | 19 | 26 | 26 | 52 | 252 | 61 | 31 | 29 | 31 | 38 |
8 | 17 | 17 | 18 | 27 | 25 | 58 | 110 | 47 | 37 | 230 | 28 | 38 |
9 | 18 | 16 | 18 | 25 | 23 | 39 | 82 | 93 | 30 | 945 | 25 | 36 |
10 | 17 | 17 | 18 | 24 | 25 | 30 | 68 | 237 | 63 | 1450 | 24 | 35 |
11 | 16 | 18 | 18 | 23 | 25 | 29 | 59 | 102 | 101 | 206 | 25 | 35 |
12 | 17 | 17 | 19 | 24 | 24 | 38 | 49 | 70 | 47 | 118 | 26 | 34 |
13 | 17 | 17 | 19 | 25 | 24 | 37 | 44 | 54 | 232 | 86 | 25 | 31 |
14 | 18 | 19 | 18 | 24 | 39 | 31 | 41 | 53 | 80 | 77 | 25 | 50 |
15 | 19 | 28 | 17 | 24 | 29 | 31 | 40 | 56 | 50 | 68 | 23 | 30 |
16 | 19 | 19 | 17 | 25 | 30 | 32 | 38 | 45 | 43 | 60 | 22 | 28 |
17 | 19 | 18 | 17 | 24 | 24 | 32 | 46 | 40 | 35 | 51 | 22 | 25 |
18 | 34 | 19 | 136 | 24 | 25 | 30 | 37 | 38 | 40 | 55 | 21 | 24 |
19 | 47 | 19 | 64 | 22 | 35 | 80 | 35 | 39 | 38 | 47 | 20 | 23 |
20 | 15 | 20 | 36 | 22 | 53 | 78 | 43 | 38 | 30 | 43 | 20 | 21 |
21 | 14 | 24 | 30 | 22 | 56 | 60 | 36 | 33 | 28 | 149 | 22 | 22 |
22 | 14 | 25 | 26 | 21 | 44 | 43 | 34 | 31 | 28 | 54 | 20 | 25 |
23 | 12 | 23 | 25 | 22 | 31 | 37 | 31 | 30 | 32 | 46 | 18 | 22 |
24 | 13 | 21 | 23 | 22 | 28 | 34 | 45 | 28 | 32 | 37 | 19 | 24 |
25 | 27 | 22 | 21 | 22 | 24 | 57 | 78 | 27 | 45 | 34 | 21 | 21 |
26 | 16 | 22 | 23 | 21 | 24 | 36 | 42 | 27 | 78 | 31 | 22 | 52 |
27 | 14 | 23 | 23 | 22 | 24 | 33 | 35 | 28 | 34 | 31 | 22 | 31 |
28 | 14 | 19 | 23 | 24 | 24 | 57 | 36 | 30 | 119 | 62 | 23 | 22 |
29 | 64 | 19 | 23 | 24 | --- | 40 | 34 | 28 | 72 | 37 | 121 | 22 |
30 | 25 | 19 | 47 | 24 | --- | 34 | 62 | 27 | 61 | 29 | 34 | 21 |
31 | 23 | --- | 31 | 41 | --- | 33 | --- | 26 | --- | 29 | 184 | --- |
TOTAL | 694 | 607 | 843 | 759 | 914 | 1225 | 1870 | 1676 | 1585 | 4194 | 1228 | 1529 |
MEAN | 22.4 | 20.2 | 27.2 | 24.5 | 32.6 | 39.5 | 62.3 | 54.1 | 52.8 | 135 | 39.6 | 51.0 |
MAX | 67 | 43 | 136 | 41 | 61 | 80 | 252 | 237 | 232 | 1450 | 184 | 465 |
MIN | 12 | 15 | 17 | 21 | 23 | 23 | 31 | 26 | 24 | 27 | 18 | 21 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2003, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 35.8 | 44.7 | 50.4 | 40.1 | 58.2 | 78.7 | 70.6 | 75.5 | 55.6 | 45.6 | 44.3 | 40.8 |
MAX | 152 | 203 | 201 | 130 | 148 | 238 | 146 | 181 | 118 | 135 | 138 | 178 |
(WY) | 1987 | 1986 | 1983 | 1993 | 1976 | 1979 | 1979 | 1984 | 1993 | 2003 | 1981 | 1993 |
MIN | 17.1 | 17.5 | 14.0 | 15.5 | 22.5 | 29.6 | 28.1 | 28.0 | 21.1 | 17.2 | 16.5 | 17.0 |
(WY) | 1975 | 1977 | 1977 | 1977 | 1980 | 1981 | 1977 | 1987 | 1988 | 1994 | 1988 | 1998 |
SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1975 - 2003 | |||
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ANNUAL TOTAL | 19770 | 17124 | ||||
ANNUAL MEAN | 54.2 | 46.9 | 53.3 | |||
HIGHEST ANNUAL MEAN | 99.6 | 1993 | ||||
LOWEST ANNUAL MEAN | 31.7 | 2000 | ||||
HIGHEST DAILY MEAN | 656 | Aug 23 | 1450 | Jul 10 | 2500 | Mar 4 1979 |
LOWEST DAILY MEAN | 12 | Oct 23 | 12 | Oct 23 | 9.0 | Dec 25 1976 |
ANNUAL SEVEN-DAY MINIMUM | 15 | Aug 6 | 16 | Oct 21 | 11 | Jul 31 2001 |
MAXIMUM PEAK FLOW | 4380 | Jul 10 | 6600 | Dec 3 1982 | ||
MAXIMUM PEAK STAGE | 12.60 | Jul 10 | 14.02 A | Dec 3 1982 | ||
INSTANTANEOUS LOW FLOW | 0.70 | Oct 21 | ||||
10 PERCENT EXCEEDS | 106 | 69 | 96 | |||
50 PERCENT EXCEEDS | 34 | 29 | 31 | |||
90 PERCENT EXCEEDS | 18 | 18 | 18 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |