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Water-Year Summary for Site 02207120

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Available Parameters
00010 Temperature, water(Max.,Min.,Mean)  
00045 Precipitation(Sum)  
00060 Discharge(Mean)  
00065 Gage height(Max.,Min.,Mean)  
00095 Specific cond at 25C(Max.,Min.,Mean)  
63680 Turbidity, Form Neph(Med.,Min.,Max.)  

Water year 2020: 2019-10-01 to 2020-09-30
 

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USGS Water-Year Summary 2020
02207120 YELLOW RIVER AT GA 124, NEAR LITHONIA, GA
LOCATION - Lat 33°46'20", long 84°03'28" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03070103, on GA 124 bridge, 5.0 miles south of the intersection of GA 124 and US 78.
DRAINAGE AREA - 161 mi².
REVISIONS HISTORY - Discharge for the period Apr. 24, 2018, to Oct. 3, 2018, was revised on May 30, 2019, based on changes to the shifting of the stage-discharge rating.
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: August 2001 to current year.
GAGE-HEIGHT: August 2001 to current year.
GAGE - Satellite telemetry with a water-stage recorder. Datum of gage is 719.5 feet above the North American Vertical Datum (NAVD) of 1988.
COOPERATION - Gwinnett County Department of Water Resources.
REMARKS -
For period: 10/01/2013-02/15/2019: Gage-height records are good. Discharge records are fair, except for estimated days, which are poor.
For period: 02/16/2019-10/07/2019: Gage-height records are good. Discharge records are good.
For period: 10/08/2019-10/06/2020: Gage-height records are good. Discharge records are good.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 16,500 cfs, September 22, 2009; maximum gage height, 27.47 ft, from floodmarks, September 22, 2009; minimum daily discharge, 19 cfs, August 22, 2008.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - August 2001 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - March 1996 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: August 2001 to current year.
WATER TEMPERATURE: August 2001 to current year.
TURBIDITY: August 2001 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and an automatic refrigerated sampler.
REMARKS -
For period: 10/01/2014-09/30/2015: Continuous water temperature and specific conductance records are good. Turbidity record is fair.
For period: 10/01/2015-09/30/2016: Continuous water temperature and specific conductance records are good. Turbidity record is fair.
For period: 10/01/2016-09/30/2017: Continuous water temperature and specific conductance records are good. Turbidity record is fair.
For period: 10/01/2017-09/30/2018: Continuous water temperature and specific conductance records are good. Turbidity record is fair.
For period: 10/01/2018-09/30/2019: Continuous water temperature and specific conductance records are good. Turbidity record is fair.

Data for parameter code 63680 (turbidity) were collected using a probe with the following specifications: turbidity, water, monochrome near infra-red LED light, 780-900 nm, detection angle 90 +/-2.5 degrees, FNU (Formazin Nephelometric Units). Prior to October 1, 2004, turbidity data were published using parameter code 00076: turbidity, water, unfiltered, NTU (Nephelometric Turbidity Units). Hydrologic event code of 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratories, Livonia, MI and Test America Laboratory, Denver, CO. Laboratory sediment analyses are by the U.S. Geological Survey, Kentucky Sediment Laboratory. Field determinations of discharge, specific conductance, pH, water temperature, turbidity, barometric pressure and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: Maximum recorded, 440 microsiemens, October 1, 2019; minimum recorded, 35 microsiemens, June 17, 2003.

WATER TEMPERATURE: Maximum recorded, 31.1°C, July 1, 2012; minimum recorded, 0.9°C, January 14, 2011.

TURBIDITY: Maximum recorded, 1,080 FNU, July 6, 2005; minimum recorded, <0.5 FNU, many days.