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 2001 TO SEPTEMBER 2002
DAILY MEAN VALUES | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| DAY | OCT | NOV | DEC | JAN | FEB | MAR | APR | MAY | JUN | JUL | AUG | SEP |
| 1 | 55 | 53 | 11 | -0.60 | 3.9 | 2.9 | -0.78 | -3.0 | 128 | 145 | 83 | 136 |
| 2 | 52 | 42 | 4.3 | 4.2 | 3.9 | 1.6 | -8.7 | -7.9 | 81 | 141 | 119 | 54 |
| 3 | 54 | 37 | -3.9 | 5.6 | 2.4 | 6.4 | 0.43 | -4.4 | -0.82 | 149 | 156 | 147 |
| 4 | 15 | 37 | 3.4 | -0.91 | 2.1 | 3.7 | 2.6 | 6.8 | 3.7 | 157 | 84 | 100 |
| 5 | 1.5 | 53 | 7.4 | 5.9 | 5.7 | 5.8 | -2.6 | -9.8 | -19 | 172 | 134 | 29 |
| 6 | -0.18 | 56 | 2.9 | 5.0 | 4.8 | 5.9 | -2.4 | 16 | 32 | 152 | 164 | 69 |
| 7 | -5.3 | 54 | 0.24 | 5.8 | 5.7 | 11 | 2.1 | -4.4 | 67 | 164 | 183 | 130 |
| 8 | 26 | 26 | 4.3 | 3.1 | 7.6 | 16 | -6.8 | 0.85 | 72 | 113 | 135 | 143 |
| 9 | 54 | 16 | 5.6 | 1.1 | 10 | 8.7 | -16 | 11 | 97 | 131 | 156 | 98 |
| 10 | 3.1 | 36 | -2.7 | 7.6 | -0.92 | -12 | 12 | 4.1 | 48 | 163 | 149 | 12 |
| 11 | 20 | 26 | 4.5 | 4.4 | 11 | 9.3 | 1.1 | 24 | 49 | 151 | 155 | 30 |
| 12 | -10 | 41 | 6.4 | -0.09 | 7.6 | -0.49 | -4.3 | 29 | 91 | 145 | 96 | 38 |
| 13 | -58 | 36 | -1.6 | 2.2 | 6.0 | 5.9 | -5.9 | -5.1 | -7.9 | 183 | 20 | 34 |
| 14 | 52 | 37 | 0.57 | 3.9 | 6.0 | -4.4 | 5.6 | 4.5 | 49 | 152 | 142 | 14 |
| 15 | -12 | 42 | 1.2 | 6.1 | 2.5 | 2.8 | e23 | 14 | 15 | 139 | 40 | 15 |
| 16 | -2.5 | 28 | 4.8 | 0.98 | 6.3 | -1.8 | e39 | -4.5 | 33 | 151 | 123 | 8.9 |
| 17 | -3.9 | 28 | -3.7 | 0.41 | 0.37 | 1.3 | e39 | -9.9 | 81 | 145 | 41 | 96 |
| 18 | 1.5 | 28 | -2.6 | 4.0 | 9.0 | -7.7 | e36 | -13 | 154 | 158 | 68 | 15 |
| 19 | -2.5 | 20 | 7.4 | 0.14 | 8.9 | 0.40 | e25 | 5.3 | 108 | 158 | 64 | 4.1 |
| 20 | 4.6 | 28 | -3.7 | -0.94 | 9.3 | -2.3 | e1 | -3.9 | 126 | 157 | 138 | -6.1 |
| 21 | -13 | 40 | 0.47 | 1.6 | 3.6 | -2.1 | e1 | 2.1 | 137 | 137 | 86 | 49 |
| 22 | -2.3 | 34 | 4.9 | 3.0 | 0.31 | 3.0 | e1 | 6.8 | 140 | 155 | -54 | 91 |
| 23 | -1.6 | 45 | 3.3 | -0.15 | 1.6 | 2.4 | e1 | 14 | 144 | 171 | -6.2 | 11 |
| 24 | 27 | 5.3 | 2.5 | -1.2 | 10 | 3.0 | -0.46 | -4.9 | 146 | 158 | -17 | 8.2 |
| 25 | -5.4 | 1.1 | 0.90 | 5.3 | 0.40 | -2.0 | 8.1 | 6.7 | 62 | 161 | 207 | 15 |
| 26 | 8.9 | 6.3 | -1.6 | 7.4 | -1.6 | 3.4 | -1.2 | 10 | 50 | 131 | 73 | 21 |
| 27 | -10 | 19 | 0.44 | 9.9 | 0.41 | 0.80 | 3.8 | 4.3 | 135 | 85 | 94 | 8.6 |
| 28 | 2.6 | 35 | 0.33 | 1.4 | 2.4 | 4.4 | 6.4 | -9.4 | 154 | 134 | 130 | 19 |
| 29 | 37 | 18 | 4.9 | -1.7 | --- | -13 | 12 | 12 | 145 | 127 | 133 | 30 |
| 30 | 54 | 6.6 | 5.2 | -0.04 | --- | 12 | -1.7 | 25 | 121 | 129 | 142 | 23 |
| 31 | 60 | --- | -1.3 | 7.5 | --- | 5.7 | --- | 90 | --- | 100 | 140 | --- |
| TOTAL | 401.52 | 934.3 | 65.85 | 90.90 | 129.27 | 70.61 | 169.29 | 206.25 | 2440.98 | 4514 | 3177.8 | 1442.7 |
| MEAN | 13.0 | 31.1 | 2.12 | 2.93 | 4.62 | 2.28 | 5.64 | 6.65 | 81.4 | 146 | 103 | 48.1 |
| MAX | 60 | 56 | 11 | 9.9 | 11 | 16 | 39 | 90 | 154 | 183 | 207 | 147 |
| MIN | -58 | 1.1 | -3.9 | -1.7 | -1.6 | -13 | -16 | -13 | -19 | 85 | -54 | -6.1 |
| e Estimated |
| STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 2000 - 2002, BY WATER YEAR (WY) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| MEAN | 23.3 | 15.0 | 0.91 | 3.60 | 3.22 | 6.74 | 11.3 | 15.6 | 45.0 | 82.7 | 72.5 | 43.5 |
| MAX | 35.2 | 31.1 | 2.12 | 6.74 | 4.62 | 14.3 | 21.1 | 31.0 | 81.4 | 146 | 103 | 53.4 |
| (WY) | 2001 | 2002 | 2002 | 2001 | 2002 | 2001 | 2001 | 2001 | 2002 | 2002 | 2002 | 2000 |
| 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 2001 CALENDAR YEAR | FOR 2002 WATER YEAR | WATER YEARS 2000 - 2002 | |||
|---|---|---|---|---|---|---|
| ANNUAL TOTAL | 8032.12 | 13643.47 | ||||
| ANNUAL MEAN | 22.0 | 37.4 | ||||
| HIGHEST ANNUAL MEAN | ||||||
| LOWEST ANNUAL MEAN | ||||||
| HIGHEST DAILY MEAN | 74 | Sep 30 | 207 | Aug 25 | 207 | Aug 25 2002 |
| LOWEST DAILY MEAN | -58 | Oct 13 | -58 | Oct 13 | -58 | Oct 13 2001 |
| ANNUAL SEVEN-DAY MINIMUM | -4.7 | Oct 12 | -4.7 | Oct 12 | -4.7 | Oct 12 2001 |
| 10 PERCENT EXCEEDS | 47 | 141 | 82 | |||
| 50 PERCENT EXCEEDS | 24 | 8.1 | 12 | |||
| 90 PERCENT EXCEEDS | -1.1 | -3.7 | -1.5 | |||
|