LOCATION.-- Lat 39°08'56", long 89°21'08" (NAD of 1927), in NW1/4SE1/4 sec.7, T.8 N., R.2 W., Montgomery County, Hydrologic Unit 07140203, on right bank at downstream side of bridge on County Highway 8, 4.5 mi northeast of Coffeen, 6.5 mi east of Hillsboro, and at mile 39.3. | |
DRAINAGE AREA.-- 55.5 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1963 to current year. | |
STAGE: Water years 1994 to current year. | |
REVISED RECORDS.-- WDR IL-75-1: Drainage area. | |
GAGE.-- Water-stage recorder, phone telemeter, and crest-stage gage. Datum of gage is 574.76 ft above NGVD of 1929. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 5,910 ft3/s, Dec. 7, 1966, from rating curve extended above 2,200 ft3/s, gage height, 14.45 ft; maximum gage height, 14.75 ft, Aug. 5, 1998, discharge, 5,030 ft3/s; no flow for many days in most years. | |
REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor. | |
| Discharge, cubic feet per second, WATER YEAR OCTOBER 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 0.73 | 1.9 | 0.66 | 52 | e3.0 | e20 | 7.1 | 4.1 | 11 | 2.6 | 1.0 | 912 |
| 2 | 0.57 | 0.84 | 0.68 | e32 | e4.0 | e21 | 5.2 | 8.0 | 10 | 3.1 | 0.88 | 870 |
| 3 | 0.48 | 0.65 | 0.62 | e10 | 4.7 | e22 | 4.5 | 6.0 | 12 | 2.2 | 48 | 34 |
| 4 | 0.67 | 0.56 | 0.62 | 5.3 | e3.4 | e24 | 4.3 | 7.6 | 16 | 1.6 | 12 | 15 |
| 5 | 0.70 | 0.69 | 0.67 | 5.4 | 2.4 | 31 | 3.7 | 221 | 13 | 1.4 | 2.6 | 8.1 |
| 6 | 0.75 | 0.74 | e0.68 | 5.2 | e1.8 | 29 | 3.8 | 60 | 11 | 1.4 | 1.5 | 5.2 |
| 7 | 0.49 | 0.81 | e0.72 | 5.0 | e1.3 | 26 | 4.0 | 45 | 16 | 0.89 | 1.0 | 3.8 |
| 8 | 0.45 | 0.81 | e0.76 | 7.4 | e1.1 | 25 | 3.7 | 280 | 14 | 0.80 | 0.56 | 3.0 |
| 9 | 0.44 | 0.98 | e0.80 | e5.5 | e0.95 | 24 | 3.1 | 180 | 10 | 1.8 | 0.43 | 2.5 |
| 10 | 0.50 | 0.93 | e0.84 | e3.8 | e0.84 | 23 | 2.7 | 945 | 12 | 31 | 0.46 | 2.2 |
| 11 | 0.66 | 0.72 | e0.90 | e2.9 | e0.77 | 21 | 2.4 | 238 | 22 | 15 | 0.26 | 2.0 |
| 12 | 0.71 | 0.67 | e1.0 | e2.4 | e0.74 | 22 | 2.1 | 45 | 596 | 3.7 | 0.14 | 1.9 |
| 13 | 0.62 | 0.69 | e1.1 | e2.2 | e0.70 | 72 | 1.9 | 31 | 64 | 2.1 | 0.18 | 1.7 |
| 14 | 0.63 | 0.74 | e1.2 | e2.0 | e2.0 | 80 | 1.7 | 26 | 85 | 1.2 | 0.15 | 1.6 |
| 15 | 0.70 | 0.67 | e1.3 | e1.8 | 185 | 50 | 1.6 | 24 | 27 | 0.81 | 0.24 | 1.4 |
| 16 | 0.60 | 0.56 | e1.5 | e1.7 | e120 | 42 | 1.5 | 22 | 18 | 0.55 | 0.22 | 1.2 |
| 17 | 0.66 | 0.73 | e1.7 | e1.6 | e95 | 38 | 3.1 | 21 | 13 | 0.77 | 0.22 | 1.4 |
| 18 | 0.56 | 0.91 | e12 | e1.5 | e80 | 35 | 5.3 | 21 | 11 | 1.6 | 0.27 | 1.3 |
| 19 | 0.73 | 1.2 | 86 | e1.6 | e250 | 52 | 3.1 | 24 | 9.8 | 35 | 0.48 | 1.4 |
| 20 | 0.70 | 1.3 | 39 | e1.7 | 319 | 104 | 25 | 250 | 8.5 | 5.7 | 0.39 | 1.8 |
| 21 | 0.68 | 0.86 | 23 | e1.5 | 129 | 93 | 28 | 44 | 6.9 | 2.2 | 0.30 | 1.5 |
| 22 | 0.73 | 1.2 | 16 | e1.2 | e76 | 67 | 8.1 | 25 | 5.8 | 1.0 | 0.21 | 1.3 |
| 23 | 0.83 | 1.1 | 8.6 | e0.95 | e50 | 43 | 4.0 | 20 | 4.6 | 0.82 | 0.24 | 1.2 |
| 24 | 0.87 | 1.3 | e6.5 | e0.80 | e38 | 33 | 3.7 | 18 | 4.0 | 0.57 | 0.31 | 1.0 |
| 25 | 1.2 | 1.2 | e5.0 | e0.70 | e31 | 26 | 4.0 | 19 | 4.7 | 0.41 | 0.25 | 1.1 |
| 26 | 0.69 | 1.1 | e4.4 | e0.64 | e24 | 21 | 4.6 | 18 | 18 | 0.35 | 0.21 | 2.8 |
| 27 | 1.7 | 1.0 | e4.2 | e0.80 | e22 | 16 | 3.4 | 16 | 16 | 0.38 | 0.14 | 7.7 |
| 28 | 1.4 | 1.1 | e5.0 | e1.0 | e21 | 16 | 2.9 | 14 | 6.9 | 1.5 | 0.09 | 5.7 |
| 29 | 1.7 | 1.0 | e5.8 | e1.3 | --- | 20 | 3.6 | 14 | 4.8 | 18 | 0.07 | 1.7 |
| 30 | 1.2 | 0.76 | e18 | e1.8 | --- | 15 | e3.3 | 14 | 3.1 | 3.5 | 0.06 | 0.96 |
| 31 | 3.1 | --- | 72 | e2.4 | --- | 8.2 | --- | 12 | --- | 1.6 | 1.3 | --- |
| TOTAL | 26.45 | 27.72 | 321.25 | 164.09 | 1467.70 | 1119.2 | 155.4 | 2672.7 | 1054.1 | 143.55 | 74.16 | 1896.46 |
| MEAN | 0.85 | 0.92 | 10.4 | 5.29 | 52.4 | 36.1 | 5.18 | 86.2 | 35.1 | 4.63 | 2.39 | 63.2 |
| MAX | 3.1 | 1.9 | 86 | 52 | 319 | 104 | 28 | 945 | 596 | 35 | 48 | 912 |
| MIN | 0.44 | 0.56 | 0.62 | 0.64 | 0.70 | 8.2 | 1.5 | 4.1 | 3.1 | 0.35 | 0.06 | 0.96 |
| CFSM | 0.02 | 0.02 | 0.19 | 0.10 | 0.94 | 0.65 | 0.09 | 1.55 | 0.63 | 0.08 | 0.04 | 1.14 |
| IN. | 0.02 | 0.02 | 0.22 | 0.11 | 0.98 | 0.75 | 0.10 | 1.79 | 0.71 | 0.10 | 0.05 | 1.27 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1964 - 2003, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 15.3 | 24.9 | 53.5 | 56.2 | 66.1 | 75.0 | 74.5 | 69.0 | 38.9 | 17.0 | 10.7 | 15.4 |
| MAX | 192 | 193 | 256 | 279 | 222 | 313 | 347 | 572 | 203 | 176 | 127 | 181 |
| (WY) | 1970 | 1994 | 1983 | 1974 | 1982 | 1978 | 1994 | 2002 | 1973 | 1982 | 1998 | 1993 |
| MIN | 0.000 | 0.082 | 0.049 | 0.16 | 1.75 | 2.90 | 4.09 | 1.36 | 0.13 | 0.000 | 0.000 | 0.000 |
| (WY) | 1964 | 1998 | 1977 | 1977 | 2000 | 2000 | 2000 | 1988 | 1988 | 1964 | 1988 | 1964 |
| SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1964 - 2003 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 36363.28 | 9122.78 | ||||
| ANNUAL MEAN | 99.6 | 25.0 | 42.9 | |||
| HIGHEST ANNUAL MEAN | 113 | 2002 | ||||
| LOWEST ANNUAL MEAN | 6.76 | 1992 | ||||
| HIGHEST DAILY MEAN | 3830 | May 7 | 945 | May 10 | 3830 | May 7 2002 |
| LOWEST DAILY MEAN | 0.08 | Sep 2, 3 | 0.06 | Aug 30 | 0.00 | A |
| ANNUAL SEVEN-DAY MINIMUM | 0.10 | Aug 30 | 0.16 | Aug 24 | 0.00 | Oct 1 1963 |
| MAXIMUM PEAK FLOW | 1920 | May 10 | 5910 B | Dec 7 1966 | ||
| MAXIMUM PEAK STAGE | 11.81 | May 10 | 14.75 C | Aug 5 1998 | ||
| INSTANTANEOUS LOW FLOW | 0.05 | Aug 30, 31 | ||||
| ANNUAL RUNOFF (CFSM) | 1.80 | 0.45 | 0.77 | |||
| ANNUAL RUNOFF (INCHES) | 24.37 | 6.11 | 10.51 | |||
| 10 PERCENT EXCEEDS | 218 | 42 | 62 | |||
| 50 PERCENT EXCEEDS | 6.4 | 2.6 | 4.8 | |||
| 90 PERCENT EXCEEDS | 0.28 | 0.57 | 0.10 | |||
B - From rating curve extended above 2,200 ft3/s, gage height, 14.45 ft. | |
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