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Water-Year Summary for Site 02203873

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

Water year 2021: 2021-10-01 to 2022-09-30
 

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USGS Water-Year Summary 2021
02203873 COBBS CREEK AT RAINBOW DR, NEAR DECATUR, GA
LOCATION - Lat 33°42'33.9", long 84°14'21.0" referenced to North American Datum of 1983, Dekalb County, GA, Hydrologic Unit 03070103,
DRAINAGE AREA - 7.97 mi².
SURFACE-WATER RECORDS
PERIOD OF RECORD -
GAGE-HEIGHT: January 2013 to current year. DISCHARGE: January 2013 to current year.
GAGE - Satellite telemetry with a water-stage recorder and continuous water-quality monitor. Datum of gage is 793 feet above National Geodetic Vertical Datum (NGVD) of 1929.
COOPERATION - DeKalb County Department of Watershed Protection.
REMARKS -
For period :01/01/2013-09/30/2014 Gage-height records are good. Discharge records are poor, except for estimated days, which are poor.
For period :10/01/2014-02/21/2019 Gage-height records are good. Discharge records are fair, except for estimated days, which are poor.
For period :02/22/2019-10/21/2020 Gage-height records are good. Discharge records are fair.
EXTREMES FOR PERIOD OF RECORD - Maximum discharge, 3,040 cfs, October 10, 2020; maximum gage-height, 13.33 feet,>October 10, 2020; minimum daily discharge, 1.53 cfs, October 3, 2019.
CLIMATOLOGICAL RECORDS
PERIOD OF RECORD - December 2, 2012 to current year.
INSTRUMENTATION - Tipping-bucket raingage.
WATER-QUALITY RECORDS
PERIOD OF RECORD - November 2013 to current year.
PERIOD OF DAILY RECORD -
SPECIFIC CONDUCTANCE: November 2013 to current year.
pH: November 2013 to current year.
WATER TEMPERATURE: November 2013 to current year.
DISSOLVED OXYGEN: November 2013 to current year.
TURBIDITY: November 2013 to current year.
INSTRUMENTATION - Satellite telemetry with a continuous water-quality monitor.
REMARKS -
For period 11/15/2013-09/30/2014: Specific conductance record good. pH record good. Water temperature record good. Dissolved oxygen record fair. Turbidity record poor.
For period 10/01/2014-09/30/2015: Specific conductance record good. pH record fair. Water temperature record good. Dissolved oxygen record fair. Turbidity record poor.
For period 10/01/2015-09/30/2016: Specific conductance record good. pH record fair. Water temperature record good. Dissolved oxygen record fair. Turbidity record poor.
For period 10/01/2016-09/30/2017: Specific conductance record good. pH record fair. Water temperature record good. Dissolved oxygen record fair. Turbidity record poor.
For period 10/01/2017-09/30/2018: Specific conductance record good. pH record fair. Water temperature record good. Dissolved oxygen record fair. Turbidity record 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). Hydrologic event 9 indicates a routine sample, while J designates a storm event sample. Laboratory chemical analyses are by RTI Laboratory, Livonia, MI. Laboratory sediment analyses are by the U.S. Geological Survey, Kentucky Sediment Laboratory. Field determinations of discharge, microbiology, specific conductance, pH, water temperature, turbidity, barometric pressure, air temperature, and dissolved oxygen are by the U.S. Geological Survey.
EXTREMES FOR PERIOD OF RECORD -

SPECIFIC CONDUCTANCE: Maximum recorded, 1860 microsiemens, January 22, 2018; minimum recorded, 18 microsiemens, September 2, 2016.

pH: Maximum recorded, 7.9 units, October 6, 2013; minimum recorded, 5.1 units, August 7, 2014.

WATER TEMPERATURE: Maximum recorded, 27.6°C, August 11, 2014; minimum recorded, 0.2°C, January 18, 2018.

DISSOLVED OXYGEN: Maximum recorded, 13.1mg/L, January 18, 2018; minimum recorded, 3.3 mg/L, November 2, 2015.

TURBIDITY: Maximum recorded, >1100 FNU, December 24, 2015; minimum recorded, <0.5 FNU many days.