Rivanna River at Palmyra, Fluvanna County VA (PYAV2)
Gage Location: Fluvanna County, Virginia	Site Location: Fluvanna County, Virginia
Latitude: 37.858	Longitude: -78.266	Elevation: 210.39 ft. MSL	Drainage Area: 663 Sq. Mi.
Minor Stage: 17 ft.	Moderate Stage: 25 ft.	Major Stage: 32 ft.
First Flood: 1934-09-17	Last Flood: 2013-01-31 Crest: 19.33 ft.	Datum change: 1933-10-01	Number of Floods: 113

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Year Before Datum Change Number of Floods

Year After Datum Change Number of Floods 1933 0 1934 2 1935 2 1936 4 1937 4 1938 0 1939 0 1940 1 1941 0 1942 2 1943 0 1944 1 1945 0 1946 0 1947 0 1948 4 1949 2 1950 1 1951 1 1952 2 1953 0 1954 0 1955 1 1956 0 1957 0 1958 0 1959 1 1960 1 1961 2 1962 1 1963 1 1964 0 1965 1 1966 0 1967 1 1968 0 1969 2 1970 0 1971 2 1972 4 1973 2 1974 0 1975 2 1976 3 1977 0 1978 3 1979 5 1980 1 1981 0 1982 3 1983 3 1984 3 1985 2 1986 0 1987 2 1988 0 1989 2 1990 2 1991 1 1992 3 1993 3 1994 2 1995 3 1996 3 1997 0 1998 5 1999 1 2000 0 2001 0 2002 0 2003 5 2004 2 2005 2 2006 1 2007 0 2008 0 2009 0 2010 1 2011 4 2012 0 2013 1

Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 08:09 AM Feb 08, 2013