LOCATION.-- Lat 41°55'52", long 88°45'34" (NAD of 1927), in SW1/4NE1/4 sec.22, T.40 N., R.4 E., De Kalb County, Hydrologic Unit 07090006, on left bank 100 ft downstream from bridge on State Highway 38 in De Kalb, and at mile 48.5. | |
DRAINAGE AREA.-- 77.7 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: July 1925 to October 1933, October 1979 to current year. | |
STAGE: Water years 1995 to current year. | |
SURFACE-WATER QUALITY | |
SEDIMENT: October 1979 to September 1981. | |
REVISED RECORDS.-- WDR IL-80-1: Drainage area. | |
GAGE.-- Water-stage recorder, phone telemeter, and crest stage gage. Datum of gage is 831.88 ft above NGVD of 1929. Mar. 23, 1980, to Sept. 30, 1983, at datum 3.0 ft higher. Oct. 1, 1979, to Mar. 22, 1980, nonrecording gage at same site at datum 3.0 ft higher. Prior to Sept. 30, 1933, nonrecording gage at same site at datum 3.40 ft higher. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 3,500 ft3/s, July 2, 1983, gage height, 15.80 ft; present datum; no flow, Aug. 7, Sept. 20, 21, 1988, Aug. 24, 1991, Sept. 11, 24, 1999 and several days in 2003. | |
SUSPENDED-SEDIMENT CONCENTRATIONS: Maximum daily mean, 1,650 mg/L June 13, 1981; minimum daily mean, 10 mg/L Mar. 9, 1980. | |
SUSPENDED-SEDIMENT LOADS: Maximum daily, 3,070 tons June 13, 1981; minimum daily, 0.04 ton Oct. 15, 1979. | |
REMARKS FOR CURRENT YEAR.-- Records good 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 | 0.82 | 1.7 | e0.25 | e0.28 | e0.01 | e0.02 | 2.8 | 270 | 80 | 7.3 | 18 | 0.26 |
| 2 | 6.7 | 1.7 | e0.22 | e0.25 | e0.01 | e0.02 | 5.2 | 171 | 60 | 6.8 | 7.2 | 0.30 |
| 3 | 1.7 | 1.9 | e0.21 | e0.21 | e0.02 | e0.02 | 3.5 | 112 | 52 | 6.9 | 2.9 | 0.14 |
| 4 | 19 | 1.7 | e0.21 | e0.19 | e0.02 | e0.02 | 9.7 | 94 | 43 | 7.0 | 2.6 | 0.04 |
| 5 | 5.0 | 2.3 | e0.22 | e0.18 | e0.01 | e0.02 | 9.2 | 229 | 36 | 11 | 2.0 | 0.00 |
| 6 | 2.7 | 2.9 | e0.24 | e0.16 | e0.01 | e0.02 | 6.3 | 173 | 34 | 8.2 | 1.9 | 0.00 |
| 7 | 2.2 | 2.7 | e0.27 | e0.14 | e0.01 | e0.04 | 8.4 | 130 | 34 | 15 | 1.4 | 0.00 |
| 8 | 1.4 | 2.5 | e0.29 | e0.12 | e0.01 | e0.09 | 8.0 | 105 | 36 | 46 | 0.78 | 0.00 |
| 9 | 1.8 | 2.6 | e0.30 | e0.10 | e0.01 | e0.26 | 7.3 | 390 | 30 | 56 | 0.56 | 0.00 |
| 10 | 0.58 | 2.8 | e0.35 | e0.08 | 0.00 | e0.46 | 6.9 | 333 | 26 | 61 | 0.51 | 0.00 |
| 11 | 0.81 | 2.8 | e0.39 | e0.07 | 0.00 | 0.82 | 5.6 | 714 | 25 | 42 | 0.66 | 0.00 |
| 12 | 0.85 | 3.1 | e0.42 | e0.06 | 0.00 | 11 | 5.9 | 457 | 22 | 47 | 0.48 | 0.88 |
| 13 | 0.89 | 3.5 | e0.47 | e0.05 | e0.01 | 13 | 5.9 | 289 | 21 | 32 | 0.24 | 0.83 |
| 14 | 1.1 | 3.5 | e0.52 | e0.04 | e0.01 | 17 | 5.9 | 224 | 20 | 21 | 0.16 | 0.65 |
| 15 | 1.4 | 0.89 | e0.62 | e0.03 | e0.01 | 18 | 6.1 | 184 | 17 | 31 | 0.17 | 0.29 |
| 16 | 1.0 | 0.94 | e1.0 | e0.03 | e0.01 | 18 | 6.6 | 154 | 15 | 12 | 0.19 | 0.11 |
| 17 | 0.87 | 1.1 | 1.9 | e0.02 | e0.01 | 19 | 8.9 | 131 | 14 | 7.9 | 0.17 | 0.02 |
| 18 | 1.4 | 1.5 | 8.1 | e0.02 | e0.01 | 13 | 4.2 | 113 | 14 | 6.3 | 0.09 | 0.00 |
| 19 | 1.7 | 1.9 | 5.9 | e0.02 | e0.01 | 11 | 4.8 | 105 | 20 | 5.8 | 0.08 | 0.00 |
| 20 | 1.7 | 2.0 | 2.4 | e0.01 | e0.01 | 15 | 5.2 | 155 | 19 | 4.9 | 0.09 | 0.00 |
| 21 | 1.6 | 2.0 | 1.6 | e0.01 | e0.01 | 7.4 | 3.4 | 127 | 14 | 9.1 | 0.11 | 0.01 |
| 22 | 1.5 | 1.8 | 1.2 | e0.01 | e0.01 | 3.6 | 2.5 | 106 | 13 | 17 | 0.56 | 0.19 |
| 23 | 1.3 | e1.1 | 0.94 | e0.01 | e0.01 | 2.2 | 2.2 | 94 | 12 | 8.0 | 0.24 | 0.00 |
| 24 | 1.4 | e0.90 | 0.76 | e0.01 | 0.01 | 1.6 | 1.9 | 82 | 11 | 4.8 | 0.10 | 0.06 |
| 25 | 4.1 | e0.76 | 0.77 | e0.01 | e0.02 | 7.7 | 1.7 | 73 | 11 | 3.2 | 0.01 | 0.00 |
| 26 | 2.1 | e0.64 | 0.70 | e0.01 | e0.02 | 3.0 | 1.3 | 63 | 13 | 2.2 | 0.00 | 0.79 |
| 27 | 1.6 | e0.54 | 0.57 | 0.0 | e0.02 | 2.1 | 3.2 | 58 | 11 | 1.8 | 0.00 | 1.8 |
| 28 | 1.5 | e0.45 | e0.50 | e0.01 | e0.02 | 6.5 | 1.4 | 56 | 11 | 2.8 | 0.05 | 0.29 |
| 29 | 1.8 | e0.37 | e0.42 | e0.01 | --- | 4.8 | 0.82 | 65 | 11 | 2.2 | 0.02 | 0.18 |
| 30 | 2.0 | e0.28 | e0.37 | e0.01 | --- | 3.0 | 51 | 66 | 8.9 | 1.7 | 0.00 | 0.14 |
| 31 | 1.6 | --- | e0.32 | e0.01 | --- | 2.3 | --- | 111 | --- | 4.2 | 0.08 | --- |
| TOTAL | 74.12 | 52.87 | 32.43 | 2.16 | 0.31 | 180.99 | 195.82 | 5434 | 733.9 | 492.1 | 41.35 | 6.98 |
| MEAN | 2.39 | 1.76 | 1.05 | 0.070 | 0.011 | 5.84 | 6.53 | 175 | 24.5 | 15.9 | 1.33 | 0.23 |
| MAX | 19 | 3.5 | 8.1 | 0.28 | 0.02 | 19 | 51 | 714 | 80 | 61 | 18 | 1.8 |
| MIN | 0.58 | 0.28 | 0.21 | 0.00 | 0.00 | 0.02 | 0.82 | 56 | 8.9 | 1.7 | 0.00 | 0.00 |
| CFSM | 0.03 | 0.02 | 0.01 | 0.00 | 0.00 | 0.08 | 0.08 | 2.26 | 0.31 | 0.20 | 0.02 | 0.00 |
| IN. | 0.04 | 0.03 | 0.02 | 0.00 | 0.00 | 0.09 | 0.09 | 2.60 | 0.35 | 0.24 | 0.02 | 0.00 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1926 - 2003, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 23.6 | 55.6 | 55.2 | 41.4 | 77.9 | 98.2 | 105 | 97.3 | 91.7 | 56.1 | 34.4 | 27.9 |
| MAX | 119 | 246 | 261 | 154 | 245 | 292 | 309 | 221 | 257 | 322 | 383 | 337 |
| (WY) | 1927 | 1986 | 1983 | 1993 | 2001 | 1993 | 1993 | 1995 | 1993 | 1983 | 1987 | 1980 |
| MIN | 0.22 | 1.43 | 0.93 | 0.070 | 0.011 | 5.84 | 6.53 | 11.4 | 9.97 | 1.52 | 0.51 | 0.23 |
| (WY) | 1934 | 1998 | 1998 | 2003 | 2003 | 2003 | 2003 | 1931 | 1930 | 1988 | 1931 | 2003 |
| SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 1926 - 2003 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 18544.81 | 7247.03 | ||||
| ANNUAL MEAN | 50.8 | 19.9 | 63.6 | |||
| HIGHEST ANNUAL MEAN | 151 | 1993 | ||||
| LOWEST ANNUAL MEAN | 13.4 | 1931 | ||||
| HIGHEST DAILY MEAN | 1040 | Jun 5 | 714 | May 11 | 2520 | Jul 3 1983 |
| LOWEST DAILY MEAN | 0.03 | Sep 17 | 0.00 | A | 0.00 | B |
| ANNUAL SEVEN-DAY MINIMUM | 0.23 | Dec 1 | 0.00 | Sep 5 | 0.00 | Sep 5 2003 |
| MAXIMUM PEAK FLOW | 760 | May 11 | 3500 | Jul 2 1983 | ||
| MAXIMUM PEAK STAGE | 8.35 | May 11 | 15.80 C | Jul 2 1983 | ||
| ANNUAL RUNOFF (CFSM) | 0.65 | 0.26 | 0.82 | |||
| ANNUAL RUNOFF (INCHES) | 8.88 | 3.47 | 11.12 | |||
| 10 PERCENT EXCEEDS | 127 | 51 | 157 | |||
| 50 PERCENT EXCEEDS | 10 | 1.6 | 26 | |||
| 90 PERCENT EXCEEDS | 0.51 | 0.01 | 1.5 | |||
B - Aug. 7, Sept. 20, 21, 1988, Aug. 24, 1991, Sept. 11, 24, 1999 and several days in 2003. | |