LOCATION.-- Lat 40°06'41", long 88°13'10" (NAD of 1983), in NE1/4NE1/4 sec.18, T.19 N., R.9 E., Champaign County, Hydrologic Unit 05120109, on left bank 17 ft. upstream from Lincoln Ave. at Urbana, and at mile 1.3.

DRAINAGE AREA.-- 4.78 mi².

PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE

DISCHARGE: December 2001 to current year.

STAGE: December 2001 to current year.

GAGE.-- Water-stage recorder, acoustic-velocity meter, phone telemeter and crest-stage gage. Datum of gage is 694.00 ft. above NGVD of 1929.

REMARKS.-- Since Aug. 1, 1960, storm runoff from 0.88 mi² at headwaters has been diverted to Saline Branch through the Northwest Diversion Conduit. Prior to the 1970's, effluent from sewage-treatment plant about 1 mi upstream from gage. Since July 1999, a retention basin 1.3 mi upstream temporarily detains water during periods of heavy runoff. Water enters the retention basin by gravity flow during periods of heavy runoff, and is pumped out during the recession, with a maximum rate of 20 ft³/s not to exceed a maximum in-stream rate of 60 ft³/s. Since Oct. 1999, some temporary storage occurs in underground conduits 0.9 mi upstream during runoff events. Channel construction near the Boneyard Creek at Urbana gage (03337000) began Aug. 30, 2001. Streamflow diversion pumpage for channel construction began Sept. 1, 2001 causing frequent fluctuations in stage. Channel construction and pumpage for channel construction ended May 6, 2003.

EXTREMES FOR PERIOD OF RECORD.--

SURFACE-WATER DISCHARGE AND STAGE: Maximum discharge 797 ft³/s, July 9, 2003, gage height, 17.00 ft; minimum, 0.01 ft³/s, Nov. 12, 2002, due to water diversion for channel construction.