USGS Water-Year Summary for Site 01673000

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	Available Parameters
	00010 Temperature, water(Max.,Min.,Med.)
	00060 Discharge(Mean)
	00095 Specific cond at 25C(Max.,Min.,Med.)
	00300 Dissolved oxygen(Max.,Min.,Med.)
	00400 pH(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Max.,Min.,Med.)
	63680 Turbidity, Form Neph(Min.,Max.,Med.) [(2)]
	99133 NO3+NO2,water,insitu(Med.,Max.,Min.)

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

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USGS Water-Year Summary 2023

01673000 PAMUNKEY RIVER NEAR HANOVER, VA

LOCATION - Lat 37°46'03", long 77°19'57" referenced to North American Datum of 1927, Hanover County, VA, Hydrologic Unit 02080106, on right bank 100 ft downstream from bridge on State Highway 614, 0.3 mi upstream from Mechumps Creek, 2.0 mi east of Hanover, and 7.0 mi upstream from Millpond Creek.

DRAINAGE AREA - 1,078 mi².

REVISIONS HISTORY - WSP 1302: 1944(M). WSP 1382: 1949. OFR 2006-1308: Drainage area.

SURFACE-WATER RECORDS

PERIOD OF RECORD - October 1941 to current year. Monthly discharge only for some periods, published in WSP 1302.

GAGE - Water-stage recorder. Datum of gage is 13.88 ft NAVD of 1988. Prior to Oct. 15 1976, nonrecording gage at present site and datum.

REMARKS - Some regulation since January 1972 by Lake Anna, capacity, 373,000 acre-ft, and occasional diurnal fluctuation at low flow caused by mill upstream from station. Statistics of monthly mean data and summary statistics for water years 1942 - 1971 (unregulated flow) are available in previous data books, water years 1991 - 1998. Unknown amount of diversion for irrigation upstream from gage. Maximum discharge, 40,300 ft³/s, from rating curve extended above 22,000 ft³/s.

EXTREMES OUTSIDE PERIOD OF RECORD - Flood in August 1928 reached a stage of 32.6 ft, from information by local residents.

EXTREMES FOR PERIOD PRIOR TO REGULATION - 1942-71: Maximum peak flow, 40,300 ft³/s, Aug. 23, 1969; gage height 31.12 ft, from floodmarks. Instantaneous low flow, 12 ft³/s, Sept. 12, 1966.

WATER-QUALITY RECORDS

PERIOD OF RECORD - Water years 1946, 1952, 1968 to current year.

PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: March 2012 to current year.
NITRATE: September 2016 to current year.
pH: March 2007 to current year.
SPECIFIC CONDUCTANCE: April 1968 to January 1976, October 1989 to September 1991 (unpublished), October 1991 to September 1994, March 2007 to current year.
TURBIDITY: March 2007 to current year.
WATER TEMPERATURE: October 1945 to September 1946, April 1968 to January 1976, March 2007 to current year.

INSTRUMENTATION - Water-quality and nitrate monitors. Electronic data logger with 15-minute recording interval.

EXTREMES FOR PERIOD OF DAILY RECORD -
DISSOLVED OXYGEN: Maximum: 14.7 mg/L, Feb. 16, 2015, but may have been higher during periods of missing record; minimum: 4.6 mg/L, July 9 and Aug. 7, 2012, but may have been lower during periods of missing record.
NITRATE: Maximum: 0.66 mg/L as N, Sept. 29, 2016, but may have been higher during periods of missing record; minimum: 0.25 mg/L as N, Sept. 20, 2016, but may have been lower during periods of missing record.
pH: Maximum: 8.6 standard units, Dec. 12, 2007 and Nov. 3, 2008, but may have been higher during periods of missing record; minimum: 6.0 standard units, June 29, 30, 2010 and Sept. 13, 2011, but may have been lower during periods of missing record.
SPECIFIC CONDUCTANCE: Maximum: 772 microsiemens/cm, Oct. 22, 2007, but may have been higher during periods of missing record; minimum: 36 microsiemens/cm, Sept. 25, 1975, but may have been lower during periods of missing record.
TURBIDITY: Maximum: 710 FNU, June 26, 2015, but may have been higher during periods of missing record; minimum: 0.0 FNU, on many days.
WATER TEMPERATURE: Maximum: 33.4 °C, July 23, 2011, but may have been higher during periods of missing record; minimum: -0.1 °C, several days, but may have been lower during periods of missing record.