LOCATION.-- Lat 41ü°36'51", long 87ü°43'46" (NAD of 1927), in SE1/4NW1/4 sec.15, T.36 N., R.13 E., Cook County, Hydrologic Unit 07120003, on right bank at downstream side of bridge on Kilbourn Avenue in Oak Forest, and at mile 5.9. | |
DRAINAGE AREA.-- 12.6 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1950 to current year. Prior to October 1974, records published with those for streams in the St. Lawrence River basin (WSP 1307, 1727, 1911, 2111, WDR-IL 1971-74). | |
STAGE: Water years 1994-2002. | |
REVISED RECORDS.-- WSP 1337: 1951-53: WSP 1911: Drainage area. | |
GAGE.-- Water-stage recorder and phone telemeter. Datum of gage is 620.41 ft above NGVD of 1929 (Cook County Highway Department bench mark). | |
REMARKS.-- Diurnal fluctuation at low flow caused by small industrial plants upstream. Retention pond 1.0 mi upstream detains water during periods of heavy runoff and gradually releases water during the recession. Flow bypassed gage from Nov. 21, 1962, to Mar. 2, 1963, due to diversion 1.0 mi upstream. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 627 ft3/s, Apr. 22, 1973, gage height, 7.67 ft; maximum gage height, 9.00 ft, July 13, 1957, discharge, 550 ft3/s; no flow at times in most years. | |
REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor. | |
| DISCHARGE, in CFS, WATER YEAR OCTOBER 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 1.2 | 3.3 | 12 | e2.5 | 28 | 5.9 | 6.8 | 7.4 | 5.3 | 1.9 | 1.7 | 0.43 |
| 2 | 1.4 | 7.7 | 6.0 | e2.2 | 21 | 10 | 41 | 6.8 | 4.1 | 1.9 | 1.5 | 7.3 |
| 3 | 1.3 | 4.3 | 4.1 | e2.3 | 15 | e18 | 26 | 4.7 | 3.0 | 1.9 | 1.3 | 7.9 |
| 4 | 4.0 | 3.0 | 3.9 | e2.5 | e13 | e15 | 14 | 3.8 | 8.6 | 2.7 | 1.8 | 10 |
| 5 | 44 | 2.6 | 3.5 | e2.6 | e11 | 12 | 8.9 | 3.1 | 9.1 | 3.8 | 26 | 6.5 |
| 6 | 12 | 2.6 | 2.6 | e2.7 | e10 | 17 | 6.2 | 16 | 3.9 | 2.0 | 6.9 | 3.0 |
| 7 | 5.6 | 2.7 | 2.7 | e2.7 | 8.3 | 38 | 13 | 10 | 2.9 | 1.7 | 3.7 | 2.1 |
| 8 | 4.5 | 3.2 | 2.4 | e2.6 | 9.1 | 65 | 48 | 33 | 2.7 | 1.5 | 2.7 | 1.1 |
| 9 | 4.6 | 3.2 | 2.0 | e2.5 | 19 | 80 | 92 | 64 | 2.3 | 28 | 2.4 | 1.6 |
| 10 | 4.6 | 2.9 | 1.9 | e2.4 | 38 | 52 | 40 | 41 | 3.4 | 8.9 | 1.8 | 2.9 |
| 11 | 5.2 | 2.4 | 2.0 | e2.2 | 22 | 27 | 20 | 58 | 11 | 2.7 | 1.1 | 3.5 |
| 12 | 44 | 2.1 | 2.2 | e2.1 | 13 | 17 | 17 | 149 | 4.7 | 2.0 | 1.2 | 2.6 |
| 13 | 49 | 3.9 | 4.6 | e2.0 | 12 | 18 | 9.1 | 118 | 3.3 | 1.4 | 3.7 | 1.8 |
| 14 | 114 | 5.3 | 9.9 | e1.9 | 7.8 | 9.4 | 6.8 | 105 | 10 | 0.91 | 4.4 | 1.5 |
| 15 | 72 | 5.1 | 13 | e1.9 | 7.4 | 7.6 | 8.4 | 71 | 7.9 | e0.98 | 2.3 | 0.65 |
| 16 | 26 | 3.6 | 8.6 | e1.8 | 6.7 | 5.7 | 5.7 | 31 | 3.2 | e1.3 | 5.7 | 0.59 |
| 17 | 15 | 3.0 | 20 | e1.8 | 5.4 | 4.6 | 9.1 | 31 | 2.8 | 1.4 | 4.0 | 2.3 |
| 18 | 12 | 2.5 | 17 | e1.8 | 4.6 | 4.3 | 6.1 | 19 | 2.4 | 1.5 | 2.0 | 15 |
| 19 | 13 | 3.4 | 12 | e1.7 | 9.8 | 4.3 | 5.1 | 16 | 2.6 | 1.3 | 7.3 | 7.8 |
| 20 | 4.4 | 4.5 | 10 | e1.7 | 28 | 4.4 | 29 | 17 | 2.2 | 1.1 | 5.6 | 14 |
| 21 | 3.5 | 3.4 | 8.4 | e1.6 | 37 | 13 | 21 | 18 | 2.1 | 0.58 | 3.0 | 9.8 |
| 22 | 3.3 | 3.0 | 7.6 | e1.5 | 28 | 12 | 16 | 15 | 2.0 | 0.76 | 13 | 6.5 |
| 23 | 32 | 2.7 | 9.1 | e3.0 | 14 | 4.3 | 10 | 5.0 | 1.5 | 1.2 | 8.4 | 6.1 |
| 24 | 26 | 2.9 | 8.4 | 6.7 | 9.9 | 2.8 | 9.4 | 21 | 1.5 | 1.1 | 5.2 | 3.9 |
| 25 | 31 | 6.5 | e7.7 | 6.7 | 8.9 | 2.8 | 13 | 10 | 9.6 | 0.99 | 3.2 | 3.1 |
| 26 | 13 | 6.1 | e5.5 | 5.9 | 12 | 4.4 | 6.3 | 6.6 | 8.6 | 0.96 | 2.4 | 2.5 |
| 27 | 6.2 | 5.0 | e4.9 | 5.2 | 10 | 3.7 | 19 | 4.6 | 8.8 | 4.9 | 2.2 | 2.1 |
| 28 | 4.3 | 3.7 | e4.6 | 4.8 | 7.8 | 3.5 | 36 | 5.3 | 4.3 | 3.8 | 1.8 | 1.8 |
| 29 | 3.5 | 4.6 | e4.2 | 5.2 | --- | 12 | 21 | 5.3 | 2.8 | 2.7 | 1.6 | 5.6 |
| 30 | 10 | 24 | e3.7 | 8.6 | --- | 13 | 11 | 15 | 2.3 | 3.5 | 1.4 | 5.4 |
| 31 | 3.6 | --- | e3.0 | 20 | --- | 5.9 | --- | 10 | --- | 1.9 | 1.2 | --- |
| TOTAL | 574.2 | 133.2 | 207.5 | 113.1 | 416.7 | 492.6 | 574.9 | 920.6 | 138.9 | 91.28 | 130.5 | 139.37 |
| MEAN | 18.52 | 4.440 | 6.694 | 3.648 | 14.88 | 15.89 | 19.16 | 29.70 | 4.630 | 2.945 | 4.210 | 4.646 |
| MAX | 114 | 24 | 20 | 20 | 38 | 80 | 92 | 149 | 11 | 28 | 26 | 15 |
| MIN | 1.2 | 2.1 | 1.9 | 1.5 | 4.6 | 2.8 | 5.1 | 3.1 | 1.5 | 0.58 | 1.1 | 0.43 |
| CFSM | 1.47 | 0.35 | 0.53 | 0.29 | 1.18 | 1.26 | 1.52 | 2.36 | 0.37 | 0.23 | 0.33 | 0.37 |
| IN. | 1.70 | 0.39 | 0.61 | 0.33 | 1.23 | 1.45 | 1.70 | 2.72 | 0.41 | 0.27 | 0.39 | 0.41 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1951 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 7.046 | 9.875 | 10.90 | 10.58 | 14.13 | 21.86 | 21.43 | 15.98 | 13.26 | 8.878 | 6.204 | 7.326 |
| MAX | 70.9 | 40.7 | 70.9 | 43.9 | 68.9 | 86.9 | 53.5 | 46.1 | 60.0 | 67.8 | 22.0 | 43.6 |
| (WY) | 1955 | 1986 | 1983 | 1993 | 1997 | 1979 | 1973 | 1990 | 1981 | 1996 | 1979 | 1977 |
| MIN | 0.035 | 0.17 | 0.000 | 0.000 | 0.000 | 3.13 | 1.41 | 1.84 | 0.88 | 0.29 | 0.25 | 0.11 |
| (WY) | 1964 | 1965 | 1963 | 1963 | 1963 | 1964 | 1963 | 1968 | 1965 | 1964 | 1966 | 1963 |
| SUMMARY STATISTICS | FOR 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 1951 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 4818.50 | 3932.85 | ||||
| ANNUAL MEAN | 13.20 | 10.77 | 12.27 | |||
| HIGHEST ANNUAL MEAN | 21.0 | 1993 | ||||
| LOWEST ANNUAL MEAN | 2.68 | 1963 | ||||
| HIGHEST DAILY MEAN | 219 | Feb 9 | 149 | May 12 | 448 | Oct 11 1954 |
| LOWEST DAILY MEAN | 0.65 | Sep 16 | 0.43 | Sep 1 | 0.00 | A |
| ANNUAL SEVEN-DAY MINIMUM | 0.98 | Jul 10 | 0.96 | Jul 20 | 0.00 | Nov 22 1962 |
| MAXIMUM PEAK FLOW | 263 | May 12 | 627 B | Apr 22 1973 | ||
| MAXIMUM PEAK STAGE | 4.53 | May 12 | 9.00 C | Jul 13 1957 | ||
| INSTANTANEOUS LOW FLOW | 0.33 | Sep 1,2 | ||||
| ANNUAL RUNOFF (CFSM) | 1.05 | 0.86 | 0.97 | |||
| ANNUAL RUNOFF (INCHES) | 14.23 | 11.61 | 13.23 | |||
| 10 PERCENT EXCEEDS | 28 | 26 | 31 | |||
| 50 PERCENT EXCEEDS | 6.9 | 5.0 | 3.6 | |||
| 90 PERCENT EXCEEDS | 1.5 | 1.7 | 0.55 | |||