LOCATION.-- Lat 42°04'16", long 87°41'09" (NAD of 1927), in NE1/4SW1/4 sec.35, T.42 S., R.13 W., Cook County, Hydrologic Unit 07120003, on left bank at downstream side of bridge on Maple Avenue, 0.25 mi downstream from Wilmette Controlling Works, and at mile 7.3. | |
DRAINAGE AREA.-- Undetermined. | |
PERIOD OF RECORD.-- | |
SURFACE-WATER DISCHARGE AND STAGE | |
DISCHARGE: October 1999 to current year. | |
GAGE.-- Water-stage recorder, acoustic velocity meter, and phone telemetry. Datum of gage is 579.48 ft above NGVD of 1929 (Chicago City Datum). | |
REMARKS.--Estimated daily discharges determined from a regression relation between USGS mean discharges and mean daily discharges for the Metropolitan Water Reclamation District's Wilmette Controlling Works located 0.5 miles upstream. | |
EXTREMES FOR PERIOD OF RECORD.-- Maximum daily discharge, 241 ft3/s, Aug. 12-14, 2003, estimated by regression; minimum daily discharge, -58 ft3/s, Oct. 13, 2001. | |
REMARKS FOR CURRENT YEAR.-- Records good except those for estimated daily discharges, which are poor. | |
| Discharge, cubic feet per second, WATER YEAR OCTOBER 2000 TO SEPTEMBER 2001
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 27 | e49 | 2.3 | 1.3 | -1.1 | 17 | 14 | 38 | 3.7 | 44 | 39 | 27 |
| 2 | 27 | e49 | 0.41 | 0.05 | 1.1 | 1.9 | 25 | 45 | 1.8 | 37 | 18 | 25 |
| 3 | 27 | e49 | -1.3 | -1.2 | -0.71 | -0.58 | 25 | 40 | 18 | 42 | 28 | 48 |
| 4 | e1 | e49 | -1.9 | -0.83 | 0.05 | 2.8 | 27 | 39 | 42 | 49 | 43 | 68 |
| 5 | e45 | e49 | 1.7 | 0.78 | -0.62 | 5.5 | 19 | 44 | 3.2 | 49 | 42 | 51 |
| 6 | e49 | e44 | -0.30 | -0.54 | 13 | 30 | 12 | 33 | 30 | 42 | 36 | 45 |
| 7 | e49 | 8.1 | -0.17 | -2.0 | 23 | 27 | 26 | 10 | 44 | 14 | 29 | 27 |
| 8 | e61 | 27 | -0.25 | -2.4 | 2.7 | 26 | 25 | 14 | 46 | 44 | 46 | 19 |
| 9 | e50 | -2.9 | -1.1 | -1.5 | 20 | 24 | 20 | 33 | 49 | 44 | 34 | -0.70 |
| 10 | e49 | 1.2 | 0.63 | -2.0 | 0.64 | 23 | 20 | 30 | 47 | 51 | 42 | 38 |
| 11 | e49 | 1.7 | -1.4 | 1.4 | 3.0 | 22 | 1.9 | 29 | 42 | 46 | 39 | 43 |
| 12 | e49 | 0.27 | -2.4 | 1.7 | 0.68 | 4.9 | 17 | 40 | 24 | 46 | 43 | 35 |
| 13 | e39 | 0.59 | -3.2 | 20 | -1.1 | -0.47 | 26 | 45 | 56 | 48 | 42 | 39 |
| 14 | e29 | -0.29 | -0.47 | 26 | 0.11 | 0.11 | 28 | 22 | 36 | 49 | 45 | 35 |
| 15 | e29 | -0.31 | -0.20 | 29 | -0.60 | 1.1 | 11 | 48 | 28 | 53 | 28 | 30 |
| 16 | e29 | -0.31 | -2.2 | 29 | 11 | 3.3 | 18 | 45 | 45 | 48 | 22 | 40 |
| 17 | e29 | -0.55 | -0.31 | 27 | 1.8 | -0.77 | 25 | 45 | 40 | 24 | 36 | 41 |
| 18 | e29 | -0.87 | -0.62 | 25 | -0.53 | 0.56 | 25 | 41 | 27 | 41 | 15 | 25 |
| 19 | 24 | -3.2 | 0.15 | 21 | 1.7 | 2.4 | 19 | 44 | 37 | 51 | 16 | 2.7 |
| 20 | 23 | 0.46 | 0.14 | 13 | -0.31 | 13 | 20 | 30 | 42 | 52 | 44 | 20 |
| 21 | 22 | -4.3 | 0.48 | -3.8 | -0.87 | 28 | 14 | 19 | 20 | 47 | 38 | 17 |
| 22 | 23 | -2.4 | 0.89 | -3.4 | 1.2 | 28 | 14 | 34 | 44 | 25 | 19 | 34 |
| 23 | 22 | -3.7 | 0.36 | -1.6 | 1.4 | 27 | 10 | 25 | 50 | 15 | 48 | -3.6 |
| 24 | 32 | -2.7 | 2.6 | -1.3 | 2.4 | 27 | 27 | 15 | 46 | 50 | 39 | -6.4 |
| 25 | 38 | -2.4 | 4.1 | 0.93 | 1.5 | 18 | 22 | 25 | 45 | 27 | 25 | -2.7 |
| 26 | 41 | 1.6 | 1.1 | 12 | 1.4 | 1.3 | 28 | 20 | 26 | 50 | 32 | 15 |
| 27 | 38 | 1.3 | 0.09 | 17 | 0.35 | 11 | 30 | -1.1 | 26 | 50 | 51 | 23 |
| 28 | 37 | 19 | 2.1 | 10 | 0.33 | 28 | 26 | 14 | 31 | 45 | 25 | 29 |
| 29 | 38 | 0.32 | 1.2 | -1.5 | --- | 27 | 29 | 37 | 27 | 45 | 34 | 29 |
| 30 | 38 | 1.5 | 2.2 | -3.9 | --- | 27 | 30 | 43 | 48 | 49 | 41 | 74 |
| 31 | e47 | --- | 1.7 | -0.11 | --- | 17 | --- | 16 | --- | 52 | 43 | --- |
| TOTAL | 1090 | 328.11 | 6.33 | 209.08 | 81.52 | 442.05 | 633.9 | 961.9 | 1024.7 | 1329 | 1082 | 866.30 |
| MEAN | 35.2 | 10.9 | 0.20 | 6.74 | 2.91 | 14.3 | 21.1 | 31.0 | 34.2 | 42.9 | 34.9 | 28.9 |
| MAX | 61 | 49 | 4.1 | 29 | 23 | 30 | 30 | 48 | 56 | 53 | 51 | 74 |
| MIN | 1.0 | -4.3 | -3.2 | -3.9 | -1.1 | -0.77 | 1.9 | -1.1 | 1.8 | 14 | 15 | -6.4 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 2000 - 2001, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 28.5 | 6.91 | 0.31 | 3.93 | 2.54 | 8.97 | 14.1 | 20.0 | 26.9 | 51.2 | 57.4 | 41.2 |
| MAX | 35.2 | 10.9 | 0.41 | 6.74 | 2.91 | 14.3 | 21.1 | 31.0 | 34.2 | 59.6 | 80.0 | 53.4 |
| (WY) | 2001 | 2001 | 2000 | 2001 | 2001 | 2001 | 2001 | 2001 | 2001 | 2000 | 2000 | 2000 |
| MIN | 21.8 | 2.88 | 0.20 | 1.11 | 2.18 | 3.68 | 7.09 | 8.97 | 19.5 | 42.9 | 34.9 | 28.9 |
| (WY) | 2000 | 2000 | 2001 | 2000 | 2000 | 2000 | 2000 | 2000 | 2000 | 2001 | 2001 | 2001 |
| SUMMARY STATISTICS | FOR 2000 CALENDAR YEAR | FOR 2001 WATER YEAR | WATER YEARS 2000 - 2001 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 8642.54 | 8054.89 | ||||
| ANNUAL MEAN | 23.6 | 22.1 | ||||
| HIGHEST ANNUAL MEAN | ||||||
| LOWEST ANNUAL MEAN | ||||||
| HIGHEST DAILY MEAN | 141 | Sep 4 | 74 | Sep 30 | 141 | Sep 4 2000 |
| LOWEST DAILY MEAN | -47 | Sep 12 | -6.4 | Sep 24 | -47 | Sep 12 2000 |
| ANNUAL SEVEN-DAY MINIMUM | -3.5 | May 3 | -2.6 | Nov 19 | -3.5 | May 3 2000 |
| 10 PERCENT EXCEEDS | 76 | 48 | 50 | |||
| 50 PERCENT EXCEEDS | 5.2 | 24 | 15 | |||
| 90 PERCENT EXCEEDS | -1.7 | -0.70 | -0.87 | |||
|