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 September 2003. | |
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. | |