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 2002 TO SEPTEMBER 2003
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 35 | 9.7 | -3.5 | 3.7 | 2.9 | 8.0 | 6.8 | 32 | 195 | 18 | e50 | e11 |
| 2 | 7.2 | 12 | 51 | 11 | 12 | 5.3 | 5.9 | 46 | 2.8 | e82 | e72 | e177 |
| 3 | -2.2 | 4.4 | 12 | 67 | 5.8 | 10 | 4.1 | -0.22 | 2.6 | e34 | e74 | e208 |
| 4 | 2.0 | 8.2 | 9.3 | 15 | 7.5 | 6.4 | 9.2 | 23 | -0.61 | e71 | e149 | e87 |
| 5 | 153 | 2.9 | 14 | 5.7 | 2.2 | 9.5 | -1.7 | 15 | 6.3 | e75 | e71 | e200 |
| 6 | 21 | 15 | 4.8 | 4.1 | -1.9 | -8.2 | 7.4 | 0.55 | 9.9 | e2 | e39 | e3 |
| 7 | 42 | 2.1 | 5.5 | 5.5 | 8.0 | 5.4 | 6.8 | -6.2 | 82 | e105 | e149 | e13 |
| 8 | 15 | 27 | 1.3 | 63 | 8.1 | 4.7 | 4.0 | 4.3 | 46 | e1 | e200 | e142 |
| 9 | 18 | 9.5 | -1.1 | 14 | 10 | -1.3 | 0.58 | 29 | 175 | e52 | e240 | e106 |
| 10 | 83 | 13 | 97 | 7.8 | 11 | -0.32 | 5.1 | -2.5 | 23 | e81 | e240 | e14 |
| 11 | 134 | 7.8 | 8.5 | 109 | 5.0 | 3.0 | 6.1 | 34 | 72 | e115 | e157 | e50 |
| 12 | 61 | 117 | 9.5 | 10 | -2.0 | 5.9 | 2.0 | 109 | 19 | e80 | e241 | e28 |
| 13 | 1.5 | 132 | 5.6 | 1.6 | 33 | 14 | 17 | 158 | 1.7 | e74 | e241 | e10 |
| 14 | -4.3 | 1.0 | 67 | 5.1 | 15 | 0.93 | 12 | 61 | 200 | e20 | e241 | e10 |
| 15 | 13 | 90 | 8.0 | 50 | -14 | 7.0 | 25 | 84 | 3.2 | e96 | e240 | e113 |
| 16 | -7.0 | 114 | 4.8 | 57 | -3.8 | 11 | 8.1 | 86 | 11 | e71 | e231 | e88 |
| 17 | 11 | 71 | 8.7 | 3.7 | 5.3 | 1.2 | 6.2 | -3.6 | 16 | e37 | e170 | e78 |
| 18 | 6.8 | 0.59 | 22 | 11 | 5.4 | 2.2 | 2.7 | 108 | 42 | e153 | e240 | e143 |
| 19 | 15 | 90 | 19 | 3.6 | 20 | 13 | 9.7 | 115 | 89 | e92 | e240 | e126 |
| 20 | -17 | -3.8 | 12 | 2.9 | 6.3 | 6.9 | 153 | 209 | 6.2 | e112 | e240 | e167 |
| 21 | -28 | 3.4 | 10 | 2.1 | 7.0 | 19 | 13 | 122 | 8.1 | e165 | e145 | e225 |
| 22 | -14 | 63 | 6.0 | 5.8 | 8.9 | 9.2 | 60 | 4.5 | 139 | e240 | e240 | e74 |
| 23 | 5.7 | 15 | -1.4 | 3.6 | 11 | 9.8 | 63 | 22 | 170 | e240 | e240 | e185 |
| 24 | 4.1 | 11 | 95 | 11 | 11 | 15 | 2.8 | 125 | 95 | e240 | e240 | e93 |
| 25 | 10 | 86 | 9.1 | 12 | 4.7 | 10 | 2.3 | 25 | 38 | e240 | e185 | e91 |
| 26 | 17 | 10 | 7.4 | 5.5 | 6.9 | 2.7 | 3.8 | 173 | 74 | e137 | e33 | e2 |
| 27 | -1.2 | 16 | 107 | 10 | 3.7 | 7.8 | 8.6 | 94 | 82 | e80 | e114 | e2 |
| 28 | 4.7 | 5.3 | 8.8 | 12 | 11 | 11 | 2.3 | 93 | 17 | e188 | e117 | e2 |
| 29 | 36 | 8.6 | 2.1 | 9.2 | --- | 8.0 | 1.0 | 9.1 | 42 | e240 | e139 | e67 |
| 30 | 11 | 6.7 | 3.0 | -13 | --- | 5.3 | 5.2 | 16 | 114 | e240 | e240 | e26 |
| 31 | 10 | --- | 97 | 0.97 | --- | 12 | --- | 21 | --- | e194 | e150 | --- |
| TOTAL | 643.3 | 948.39 | 699.4 | 509.87 | 200.0 | 214.41 | 451.98 | 1805.93 | 1781.19 | 3575 | 5368 | 2541 |
| MEAN | 20.8 | 31.6 | 22.6 | 16.4 | 7.14 | 6.92 | 15.1 | 58.3 | 59.4 | 115 | 173 | 84.7 |
| MAX | 153 | 132 | 107 | 109 | 33 | 19 | 153 | 209 | 200 | 240 | 241 | 225 |
| MIN | -28 | -3.8 | -3.5 | -13 | -14 | -8.2 | -1.7 | -6.2 | -0.61 | 1.0 | 33 | 2.0 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 2000 - 2003, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 22.7 | 19.1 | 6.33 | 6.81 | 4.20 | 6.78 | 12.2 | 26.2 | 48.6 | 90.8 | 97.6 | 53.8 |
| MAX | 35.2 | 31.6 | 22.6 | 16.4 | 7.14 | 14.3 | 21.1 | 58.3 | 81.4 | 146 | 173 | 84.7 |
| (WY) | 2001 | 2003 | 2003 | 2003 | 2003 | 2001 | 2001 | 2003 | 2002 | 2002 | 2003 | 2003 |
| MIN | 13.0 | 2.88 | 0.20 | 1.11 | 2.18 | 2.28 | 5.64 | 6.65 | 19.5 | 42.9 | 34.9 | 28.9 |
| (WY) | 2002 | 2000 | 2001 | 2000 | 2000 | 2002 | 2002 | 2002 | 2000 | 2001 | 2001 | 2001 |
| SUMMARY STATISTICS | FOR 2002 CALENDAR YEAR | FOR 2003 WATER YEAR | WATER YEARS 2000 - 2003 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 14532.89 | 18738.47 | ||||
| ANNUAL MEAN | 39.8 | 51.3 | ||||
| HIGHEST ANNUAL MEAN | ||||||
| LOWEST ANNUAL MEAN | ||||||
| HIGHEST DAILY MEAN | 207 | Aug 25 | 241 A | Aug 12-14 | 241 A | B |
| LOWEST DAILY MEAN | -54 | Aug 22 | -28 | Oct 21 | -58 | Oct 13 2001 |
| ANNUAL SEVEN-DAY MINIMUM | -4.7 | Oct 16 | -4.7 | Oct 16 | -4.7 | Oct 16 2002 |
| 10 PERCENT EXCEEDS | 142 | 168 | 104 | |||
| 50 PERCENT EXCEEDS | 9.3 | 12 | 12 | |||
| 90 PERCENT EXCEEDS | -2.3 | 1.6 | -1.1 | |||
|