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 1994-2002. |
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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 poor. Effluent from sewage-treatment plant upstream averaged 36.7 ft3/s and contains publicly supplied water from Lake Bloomington and Lake Evergreen and ground-water sources. The maximum monthly effluent was 46.9 ft3/s in March and the minimum was 29.1 ft3/s in January. |
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 | 14 | 21 | 50 | 22 | 142 | 53 | 50 | 110 | 42 | 27 | 28 | 30 |
2 | 12 | 93 | 37 | 22 | 96 | 129 | 53 | 100 | 40 | 26 | 29 | 31 |
3 | 13 | 26 | 35 | 22 | 78 | 105 | 46 | 79 | 39 | 25 | 19 | 31 |
4 | 19 | 21 | 34 | 23 | 64 | 80 | 44 | 72 | 50 | 22 | 17 | 27 |
5 | 126 | 19 | 34 | 23 | 58 | 89 | 42 | 68 | 50 | 21 | 18 | 27 |
6 | 23 | 48 | 36 | 25 | 54 | 121 | 40 | 80 | 41 | 20 | 15 | 25 |
7 | 14 | 63 | 31 | 23 | 50 | 123 | 46 | 68 | 34 | 19 | 14 | 22 |
8 | 14 | 61 | 29 | 24 | 46 | 132 | 122 | 70 | 29 | 21 | 13 | 21 |
9 | 13 | 57 | 27 | 24 | 44 | 261 | 79 | 145 | 28 | 28 | 14 | 29 |
10 | 35 | 53 | 27 | 24 | 65 | 128 | 64 | 72 | 31 | 21 | 16 | 24 |
11 | 63 | 50 | 27 | 24 | 50 | 100 | 59 | 393 | 90 | 25 | 16 | 22 |
12 | 118 | 50 | 52 | 23 | 47 | 88 | 57 | 560 | 55 | 20 | 17 | 21 |
13 | 250 | 51 | 67 | 23 | 43 | 79 | 53 | 185 | 407 | 17 | 55 | 19 |
14 | 89 | 51 | 58 | 24 | 42 | 70 | 52 | 133 | 112 | 16 | 50 | 18 |
15 | 115 | 49 | 46 | 23 | 41 | 67 | 50 | 107 | 75 | 19 | 20 | 45 |
16 | 103 | 47 | 76 | 23 | 41 | 57 | 48 | 137 | 61 | 19 | 308 | 23 |
17 | 41 | 46 | 92 | 24 | 38 | 57 | 46 | 141 | 57 | 18 | 70 | 25 |
18 | 28 | 43 | 60 | 24 | 38 | 54 | 46 | 114 | 47 | 21 | 36 | 71 |
19 | 23 | 49 | 49 | 24 | 185 | 51 | 47 | 93 | 42 | 24 | 314 | 50 |
20 | 20 | 45 | 42 | 24 | 173 | 51 | 56 | 81 | 40 | 19 | 83 | 87 |
21 | 60 | 44 | 39 | 26 | 108 | 47 | 147 | 73 | 39 | 19 | 51 | 37 |
22 | 131 | 36 | 66 | 25 | 85 | 43 | 69 | 68 | 36 | 28 | 38 | 27 |
23 | 117 | 36 | 54 | 26 | 72 | 43 | 60 | 78 | 35 | 22 | 656 | 23 |
24 | 79 | 159 | 41 | 26 | 64 | 42 | 74 | 90 | 36 | 20 | 130 | 21 |
25 | 46 | 73 | 35 | 25 | 68 | 48 | 59 | 62 | 43 | 18 | 86 | 20 |
26 | 33 | 63 | 34 | 25 | 77 | 48 | 50 | 53 | 45 | 65 | 68 | 21 |
27 | 27 | 52 | 32 | 24 | 60 | 47 | 348 | 50 | 41 | 134 | 57 | 22 |
28 | 24 | 29 | 30 | 24 | 56 | 47 | 157 | 64 | 33 | 159 | 47 | 19 |
29 | 22 | 48 | 27 | 38 | --- | 93 | 98 | 59 | 30 | 155 | 43 | 18 |
30 | 21 | 147 | 24 | 153 | --- | 61 | 81 | 48 | 28 | 64 | 38 | 20 |
31 | 20 | --- | 24 | 417 | --- | 51 | --- | 44 | --- | 37 | 32 | --- |
TOTAL | 1713 | 1630 | 1315 | 1277 | 1985 | 2465 | 2243 | 3497 | 1736 | 1149 | 2398 | 876 |
MEAN | 55.26 | 54.33 | 42.42 | 41.19 | 70.89 | 79.52 | 74.77 | 112.8 | 57.87 | 37.06 | 77.35 | 29.20 |
MAX | 250 | 159 | 92 | 417 | 185 | 261 | 348 | 560 | 407 | 159 | 656 | 87 |
MIN | 12 | 19 | 24 | 22 | 38 | 42 | 40 | 44 | 28 | 16 | 13 | 18 |
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1975 - 2002, BY WATER YEAR (WY) | ||||||||||||
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MEAN | 36.23 | 45.54 | 51.21 | 40.61 | 59.06 | 80.08 | 70.93 | 76.31 | 55.69 | 42.41 | 44.49 | 40.40 |
MAX | 152 | 203 | 201 | 130 | 148 | 238 | 146 | 181 | 118 | 125 | 138 | 178 |
(WY) | 1987 | 1986 | 1983 | 1993 | 1976 | 1979 | 1979 | 1984 | 1993 | 1993 | 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 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1975 - 2002 | |||
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ANNUAL TOTAL | 20715.5 | 22284 | ||||
ANNUAL MEAN | 56.75 | 61.05 | 53.54 | |||
HIGHEST ANNUAL MEAN | 99.6 | 1993 | ||||
LOWEST ANNUAL MEAN | 31.7 | 2000 | ||||
HIGHEST DAILY MEAN | 514 | Jan 29 | 656 | Aug 23 | 2500 | Mar 4 1979 |
LOWEST DAILY MEAN | 9.3 | Jan 25,Aug 5 | 12 | Oct 2 | 9.0 | Dec 25 1976 |
ANNUAL SEVEN-DAY MINIMUM | 11 | Jul 31 | 15 | Aug 6 | 11 | Jul 31 2001 |
MAXIMUM PEAK FLOW | 2130 | Aug 23 | 6600 | Dec 3 1982 | ||
MAXIMUM PEAK STAGE | 8.59 | Aug 23 | 14.02 A | Dec 3 1982 | ||
INSTANTANEOUS LOW FLOW | 3.3 | Jul 14 | ||||
10 PERCENT EXCEEDS | 117 | 117 | 97 | |||
50 PERCENT EXCEEDS | 37 | 45 | 31 | |||
90 PERCENT EXCEEDS | 14 | 20 | 18 |
Table of Contents |
Introduction |
Station Descriptions |
Surface-Water Data |
Ground-Water Data |
Meteorological Data |
Biological Data |