USGS Water-Year Summary for Site 03451000

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	Available Parameters
	00045 Precipitation(Sum)
	00060 Discharge(Max.,Min.,Mean)
	00065 Gage height(Min.,Max.,Mean)

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

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USGS Water-Year Summary 2023

03451000 SWANNANOA RIVER AT BILTMORE, NC

LOCATION - Lat 35°34'06", long 82°32'41" referenced to North American Datum of 1983, Buncombe County, NC, Hydrologic Unit 06010105, at Biltmore, Buncombe County, 100 ft downstream from Biltmore Avenue Bridge, 200 ft upstream from Southern Railway Bridge,900 ft downstream from Sweeten Creek, and 1.6 miles above mouth

DRAINAGE AREA - 130 mi².

REVISIONS HISTORY -

WSP 803: 1921, 1923-26, maximum discharge. WSP 823: Drainage area. WSP 1306: 1921, 1924, 1926, maximum discharge.

Gage datum was revised on October 01, 2021, based on an error in the determination of the gage datum.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1920 to September 1926, May 1934 to current year. Monthly discharge only for some periods, published in WSP 1306.

GAGE - Data Collection Platform. Datum of gage is 1,976.37 ft. above NAVD of 1988. December 1, 1920, to September 30, 1926, nonrecording gage at site 100 ft upstream at same datum.

REMARKS -

Considerable regulation from 1925-50 (reservoir silted) by Lake Craig, 3.6 mi upstream from station. High stages are subject to backwater from French Broad River. Records for those above 6,500 ft³/s are considered poor.

Gage-height records are generally good. Discharge records are generally good except for estimated discharges, which are fair. Additional details on the accuracy of the records can be obtained by contacting the USGS South Atlantic Water Science Center at gs-w-nc_nwisweb_data_inquiries@usgs.gov.

EXTREMES OUTSIDE PERIOD OF RECORD - Maximum stage observed: 26 ft; discharge: 40,000 ft³/s in April 1791, from studies by Tennessee Valley Authority. Flood of July 1916 reached a stage of 20.7 ft; discharge, 23,000 ft³/s, from flood profile by Tennessee Valley Authority. Flood of August 16, 1928 reached a stage of 18.74 ft, from floodmarks; discharge, 17,800 ft³/s.

EXTREMES FOR PERIOD OF RECORD - Maximum discharge from rating curve extended above 9,100 ft³/s on basis of computation of peak flow over dam 3.6 mi upstream from station.

CLIMATOLOGICAL RECORDS

PERIOD OF RECORD - September 2019 to current year.

INSTRUMENTATION - Tipping bucket raingage

REMARKS - Precipitation data collected during freezing periods may not be accurately reflected in daily record.