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Water-Year Summary for Site 02336340

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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)  
00300 Dissolved oxygen(Max.,Min.,Mean)  
00400 pH(Max.,Min.,Med.)  
63680 Turbidity, Form Neph(Med.,Max.,Min.)  

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

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USGS Water-Year Summary 2019
02336340 NANCY CREEK AT JOHNSON FERRY RD, AT CHAMBLEE, GA
LOCATION - Lat 33°53'52", long 84°20'44" referenced to North American Datum of 1927, Dekalb County, GA, Hydrologic Unit 03130001,
DRAINAGE AREA - 17.8 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
DISCHARGE: March 2012 to current year.
GAGE-HEIGHT: March 2012 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 850 feet above National Geodetic Vertical Datum (NGVD) of 1929.
COOPERATION - DeKalb County Department of Watershed Protection.
REMARKS -
For period 10/01/2013-09/30/2016: Discharge record poor. Gage height record fair.
For period 10/01/2016-07/11/2018: Discharge record fair, except for days of estimated discharge, which are poor. Gage height record good.
For period 07/11/2018-08/21/2018: Discharge record good. Gage height record good.
For period 08/22/2018-10/02/2018: Discharge record poor. Gage height record poor.
EXTREMES FOR PERIOD OF RECORD -
Maximum discharge recorded 3,360 cfs August 9, 2017; maximum gage-height recorded, 17.62 feet, August 9, 2017; minimum daily discharge, 0.92 cfs, July 1, 2013.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - February 2012 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: December 2012 to current year.
pH: December 2012 to current year.
WATER TEMPERATURE: December 2012 to current year.
DISSOLVED OXYGEN: December 2012 to current year.
TURBIDITY: December 2012 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: Water temperature records are good. Specific conductance records are good. Turbidity records are poor. pH records are good. Dissolved Oxygen records are good.
For period: 10/01/2015-09/30/2016: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2016-09/30/2017: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are fair.
For period: 10/01/2017-09/30/2018: Water temperature, specific conductance, pH, and dissolved oxygen records are rated good. Turbidity records are 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). 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, specific conductance, pH, water temperature, turbidity, barometric pressure, air temperature, microbiology, and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD -
WATER TEMPERATURE: Maximum, 30.2°C, July 30, 2015; minimum, -0.1°C, January 5, 2018.

SPECIFIC CONDUCTANCE: Maximum, 438 microsiemens, February 03, 2014; minimum, 24 microsiemens, December 26, 2012, February 26, 2013, and June 5, 2013.

DISSOLVED OXYGEN: Maximum, 13.6 mg/L, January 5, 2018; minimum, 4.2 mg/L, May 12, 2017.

pH: Maximum,  9.2 standard units, September 29, 2014; minimum, 6.0 units, August 13, 2015.

TURBIDITY: Maximum, 650 FNU on June 5, 2013; minimum, <0.5 FNU, November 8, 9, 2014, November 14, 2017.