USGS Water-Year Summary for Site 02301719

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	Available Parameters
	00010 Temperature, water(Min.,Max.)
	00060 Discharge(Mean)
	00065 Gage height(Min.,Mean,Max.)
	00095 Specific cond at 25C(Min.,Max.)
	63160 Stream level, NAVD88(Max.,Min.)
	72137 Discharge,tide fltrd(Mean)

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Water year 2023: 2022-10-01 to 2023-09-30

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USGS Water-Year Summary 2023

02301719 ALAFIA RIVER NEAR GIBSONTON, FL.

LOCATION - Lat 27°51'24", long 82°21'28" referenced to North American Datum of 1927, in NE 1/4 NW 1/4 SE 1/4 sec.24, T.30 S., R.19 E., Hillsborough County, FL, Hydrologic Unit 03100204, (Riverview quadrangle), on wooden private dock about 400 feet downstream from the Alafia River Marina on left bank, 0.8 mile west of I - 75 and 2.8 mile upstream from mouth.

DRAINAGE AREA - 419 mi².

SURFACE-WATER RECORDS

PERIOD OF RECORD - November 1999 to September 2003 (maximum and minimum residual discharge); October 2003 to October 2014 (daily mean residual discharge; October 2014 to October 2015 (maximum and minimum gage heights only) discontinued.

GAGE - Water-stage recorder. Datum of gage is National Geodetic Vertical Datum of 1929 and 1.28 ft. below North American Vertical Datum of 1988.

COOPERATION - This gage is monitored in cooperation with Southwest Florida Water Management District.

REMARKS - Streamflow at this site is significantly affected by astronomical tides. The residuals are not total freshwater flows but are a combination of freshwater flows and water storage caused by higher and lower mean water levels from the Gulf of Mexico and storm surges from tropical storm events. By convention, the U.S. Geological Survey has established ebb (seaward) flows as positive flow and flood (landward) flows as negative flows.

EXTREMES FOR PERIOD OF RECORD - Maximum gage height, 6.19 ft, Sept. 6, 2004; minimum, 2.30 ft below NGVD 29, Dec. 15, 2004.

WATER-QUALITY RECORDS

PERIOD OF RECORD - November 1999 to October 2015 (discontinued).

COOPERATION - This gage is monitored in cooperation with Southwest Florida Water Management District.

INSTRUMENTATION - Water-quality monitor consisting of specific conductance and temperature sensors located near the bottom. Sensor records temperature and specific conductance at about an elevation of 2.0 ft below National Geodetic Vertical Datum of 1929.

REMARKS - Interruptions in record are due to extreme low tides.

EXTREMES FOR PERIOD OF RECORD - SPECIFIC CONDUCTANCE: Maximum, 49,400 microsiemens, June 19, 2001; minimum, 74 microsiemens, Dec. 15, 2004. TEMPERATURE: Maximum, 34.8°C, June 22, 2011; minimum, 6.5°C, June 10, 2010.