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Water-Year Summary for Site 02208150

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

Water year 2024: 2024-10-01 to 2025-09-30
 

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USGS Water-Year Summary 2024
02208150 ALCOVY RIVER AT NEW HOPE ROAD, NEAR GRAYSON, GA
LOCATION - Lat 33°55'01", long 83°53'17" referenced to North American Datum of 1983, Gwinnett County, GA, Hydrologic Unit 03070103, 8.0 feet downstream of bridge at New Hope Road, and 4.2 miles northeast of Grayson.
DRAINAGE AREA - 30.8 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: March 2001 to current year.
GAGE-HEIGHT: March 2001 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 785.51 feet above NAVD88.
COOPERATION - Gwinnett County Department of Water Resources.
REMARKS - Gage-height records are generally good. Discharge records are generally fair except for estimated discharges, which are poor.  Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-ga_nwisweb_data_inquiries@usgs.gov.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge recorded, 8,630 cfs June 17, 2003: maximum gage-height recorded, 14.93 feet, June 17, 2003; minimum daily discharge, 2.5 cfs, August 13, 2002.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - March 2001 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - October 1996 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: March 2001 to current year.
WATER TEMPERATURE: March 2001 to current year.
TURBIDITY: March 2001 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor and a refrigerated automatic sampler.
REMARKS -
For period 10/01/2014-09/30/2015: Water temperature and specific conductance records are rated good. Turbidity records are rated poor.
For period 10/01/2015-09/30/2016: Water temperature and specific conductance records are rated fair. Turbidity records are rated poor.
For period 10/01/2016-09/30/2017: Water temperature and specific conductance records are rated fair. Turbidity records are rated poor.
For period 10/01/2017-09/30/2018: Water temperature and specific conductance records are rated fair. Turbidity records are rated poor.
For period 10/01/2018-09/30/2019: Water temperature and specific conductance records are rated fair. Turbidity records are rated poor.

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 9 indicates a routine sample while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratories, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, Kentucky Sediment Laboratory. Field determinations of discharge, gage height, specific conductance, pH, water temperature, air temperature, turbidity, barometric pressure, and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF DAILY RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 135 microsiemens, January 12, 2011; minimum recorded, 14 microsiemens, June 17, 2003.

WATER TEMPERATURE: Maximum recorded, 28.7 °C, August 9, 2007; minimum recorded, -0.1 °C, January 7, 2018.

TURBIDITY: Maximum recorded, >2,200 FNU, several days; minimum recorded, <0.5 FNU January 19-21, 2011.