LOCATION.-- Lat 42°08'18", long 87°50'04" (NAD of 1927), in SW1/4SE1/4 sec.4, T.42 N., R.12 E., Cook County, Hydrologic Unit 07120003, on left bank at upstream side of bridge on State Highway 68 at Northbrook, and at mile 7.9. | |
DRAINAGE AREA.-- 11.5 mi2. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: August 1952 to current year. | |
STAGE: Water years 1994 to current year. | |
GAGE.-- Water-stage recorder, and phone telemeter. Datum of gage is 637.98 ft above NGVD of 1929 (Cook County Highway Department bench mark). | |
REMARKS.-- Effluent from sewage-treatment plant 1.7 mi upstream. | |
EXTREMES FOR PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge, 1,190 ft3/s, Aug. 14, 1987, gage height, 10.10 ft; no flow at times in several years. | |
REMARKS FOR CURRENT YEAR.-- Records fair except those for estimated daily discharges, which are poor. Effluent from sewage-treatment plant averaged about 4.8 ft3/s. | |
| Discharge, cubic feet per second, WATER YEAR OCTOBER 2003 TO SEPTEMBER 2004
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 3.3 | 6.1 | 9.0 | e6.1 | e4.2 | 33 | 20 | 11 | 58 | 5.4 | 5.0 | 4.4 |
| 2 | 3.2 | 63 | 8.7 | e6.2 | 4.3 | 36 | 18 | 8.3 | 27 | 5.5 | 5.3 | 4.1 |
| 3 | 13 | 130 | 7.9 | e6.2 | 5.7 | 21 | 16 | 8.2 | 18 | 40 | 22 | 3.8 |
| 4 | 6.3 | 87 | 7.8 | e6.3 | 5.4 | 46 | 15 | 8.6 | 20 | 53 | 71 | 3.7 |
| 5 | 4.2 | 86 | 21 | e6.4 | 4.8 | 167 | 14 | 7.8 | 14 | 15 | 12 | 3.9 |
| 6 | 3.9 | 26 | 12 | e6.0 | 5.8 | 62 | 12 | 7.5 | 13 | 11 | 7.2 | 4.3 |
| 7 | 3.7 | 18 | 10 | e5.6 | 6.2 | 31 | 8.5 | 6.7 | 37 | 8.9 | 5.0 | 4.5 |
| 8 | 3.8 | 13 | 9.6 | e5.4 | 6.0 | 30 | 7.9 | 6.5 | 52 | 8.2 | 4.6 | 4.2 |
| 9 | 3.7 | 11 | 23 | 5.5 | 5.5 | 20 | 7.5 | 7.0 | 37 | 12 | 4.7 | 3.8 |
| 10 | 4.2 | 11 | 103 | 5.5 | 5.2 | 16 | 6.9 | 8.3 | 69 | 46 | 4.0 | 3.9 |
| 11 | 4.6 | 9.9 | 42 | 5.6 | 5.7 | 14 | 6.5 | 11 | 71 | 13 | 3.9 | 3.5 |
| 12 | 6.7 | 9.7 | 20 | e5.6 | 5.0 | 12 | 6.3 | 9.4 | 31 | 11 | 8.0 | 3.5 |
| 13 | 5.9 | 11 | 14 | e5.6 | 4.7 | 9.5 | 6.4 | 18 | 16 | 11 | 3.4 | 4.4 |
| 14 | 44 | 8.7 | 12 | e5.5 | 4.7 | 13 | 6.1 | 55 | 26 | 6.5 | 3.3 | 3.7 |
| 15 | 13 | 8.2 | 10 | e5.4 | 4.8 | 15 | 6.1 | 37 | 14 | 6.1 | 3.2 | 5.6 |
| 16 | 9.0 | 7.9 | 9.8 | e5.2 | 4.7 | 16 | 5.8 | 17 | 9.2 | 5.4 | 3.3 | 6.0 |
| 17 | 6.2 | 11 | 9.3 | e5.6 | 4.9 | 23 | 13 | 12 | 9.6 | 5.2 | 6.2 | e4.4 |
| 18 | 5.9 | 107 | 8.7 | e5.6 | 5.4 | 18 | 7.8 | 96 | 7.1 | 4.9 | 5.1 | e4.2 |
| 19 | 5.1 | 42 | 7.7 | 5.6 | 8.2 | 21 | 6.7 | 40 | 6.1 | 5.1 | 4.3 | e4.2 |
| 20 | 6.0 | 24 | 6.7 | 4.8 | 26 | 16 | 15 | 79 | 5.7 | 6.2 | 3.8 | e4.3 |
| 21 | 5.8 | 16 | 6.6 | 4.7 | 24 | 15 | 20 | 144 | 43 | 17 | 3.4 | 4.4 |
| 22 | 5.0 | 13 | 6.8 | 4.7 | 22 | 14 | 10 | 151 | 23 | 13 | 3.5 | 4.0 |
| 23 | 4.7 | 29 | 6.8 | 4.5 | 31 | 14 | 8.0 | 64 | 12 | 17 | 3.5 | 4.3 |
| 24 | 5.5 | 25 | 6.4 | 4.2 | 32 | 32 | 10 | 34 | 11 | 8.3 | 8.8 | 4.3 |
| 25 | 10 | 16 | 5.6 | 4.4 | 25 | 22 | 24 | 32 | 8.0 | 6.3 | 5.8 | 4.2 |
| 26 | 5.2 | 12 | 5.7 | 4.5 | 22 | 65 | 13 | 22 | 6.4 | 6.3 | 4.6 | 4.4 |
| 27 | 5.6 | 11 | 5.5 | 4.6 | 19 | 37 | 9.6 | 12 | 5.6 | 5.8 | 7.8 | 4.2 |
| 28 | 5.2 | 9.7 | 10 | e4.3 | 17 | 70 | 8.7 | 8.7 | 5.7 | 4.9 | 42 | 4.5 |
| 29 | 4.1 | 9.2 | e8.0 | e4.2 | 17 | 93 | 8.1 | 8.7 | 5.4 | 4.4 | 11 | 4.7 |
| 30 | 5.2 | 8.4 | e7.5 | e4.2 | --- | 47 | 8.8 | 130 | 5.3 | 5.1 | 6.4 | 4.5 |
| 31 | 4.7 | --- | e6.4 | e4.2 | --- | 31 | --- | 108 | --- | 4.8 | 5.1 | --- |
| TOTAL | 216.7 | 839.8 | 427.5 | 162.2 | 336.2 | 1059.5 | 325.7 | 1168.7 | 666.1 | 372.3 | 287.2 | 127.9 |
| MEAN | 6.99 | 28.0 | 13.8 | 5.23 | 11.6 | 34.2 | 10.9 | 37.7 | 22.2 | 12.0 | 9.26 | 4.26 |
| MAX | 44 | 130 | 103 | 6.4 | 32 | 167 | 24 | 151 | 71 | 53 | 71 | 6.0 |
| MIN | 3.2 | 6.1 | 5.5 | 4.2 | 4.2 | 9.5 | 5.8 | 6.5 | 5.3 | 4.4 | 3.2 | 3.5 |
| CFSM | 0.61 | 2.43 | 1.20 | 0.45 | 1.01 | 2.97 | 0.94 | 3.28 | 1.93 | 1.04 | 0.81 | 0.37 |
| IN. | 0.70 | 2.72 | 1.38 | 0.52 | 1.09 | 3.43 | 1.05 | 3.78 | 2.15 | 1.20 | 0.93 | 0.41 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1952 - 2004, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 9.24 | 11.3 | 11.8 | 9.75 | 14.2 | 22.9 | 24.9 | 17.4 | 14.6 | 11.3 | 11.0 | 10.3 |
| MAX | 59.4 | 40.4 | 51.2 | 40.0 | 43.2 | 86.6 | 57.3 | 67.3 | 41.6 | 59.2 | 57.5 | 50.0 |
| (WY) | 2002 | 1986 | 1983 | 1974 | 1997 | 1979 | 1983 | 1996 | 1978 | 1982 | 1987 | 1986 |
| MIN | 0.24 | 0.34 | 0.54 | 0.38 | 1.04 | 3.01 | 6.58 | 4.61 | 1.51 | 0.50 | 0.47 | 0.24 |
| (WY) | 1954 | 1957 | 1954 | 1954 | 1963 | 1956 | 1953 | 1953 | 1956 | 1956 | 1955 | 1952 |
| SUMMARY STATISTICS | FOR 2003 CALENDAR YEAR | FOR 2004 WATER YEAR | WATER YEARS 1952 - 2004 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 5161.0 | 5989.8 | ||||
| ANNUAL MEAN | 14.1 | 16.4 | 14.1 | |||
| HIGHEST ANNUAL MEAN | 22.5 | 1993 | ||||
| LOWEST ANNUAL MEAN | 2.96 | 1953 | ||||
| HIGHEST DAILY MEAN | 144 | May 1 | 167 | Mar 5 | 753 | Aug 14 1987 |
| LOWEST DAILY MEAN | 2.1 | A | 3.2 | B | 0.00 | C |
| ANNUAL SEVEN-DAY MINIMUM | 2.4 | Aug 19 | 3.9 | Sep 8 | 0.00 | Oct 27 1956 |
| MAXIMUM PEAK FLOW | 560 | May 20 | 1190 | Aug 14 1987 | ||
| MAXIMUM PEAK STAGE | 7.28 | May 20 | 10.10 | Aug 14 1987 | ||
| INSTANTANEOUS LOW FLOW | 1.4 | Oct 3 | ||||
| ANNUAL RUNOFF (CFSM) | 1.23 | 1.42 | 1.22 | |||
| ANNUAL RUNOFF (INCHES) | 16.69 | 19.38 | 16.61 | |||
| 10 PERCENT EXCEEDS | 30 | 37 | 30 | |||
| 50 PERCENT EXCEEDS | 6.6 | 7.9 | 6.2 | |||
| 90 PERCENT EXCEEDS | 3.0 | 4.2 | 2.0 | |||