James River at Buchanan, Botetourt County VA (BNNV2)
Gage Location: Botetourt County, Virginia	Site Location: Botetourt County, Virginia
Latitude: 37.531	Longitude: -79.679	Elevation: 802.9 ft. MSL	Drainage Area: 2073 Sq. Mi.
Minor Stage: 17 ft.	Moderate Stage: 21 ft.	Major Stage: 26 ft.
First Flood: 1877-10-03	Last Flood: 2013-05-08 Crest: 19.58 ft.	Datum change: 1927-07-10	Number of Floods: 74

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Height Above Flood Stage for Entire Period of Record Height Above FS Total Occurence Percent of Crest Occurrence Cumulative Total Flood Occurrence Percent of Floods above Listed Value 17 ft to 18 ft 13 18.1 17 ft or above 72 100.0 18 ft to 19 ft 16 22.2 18 ft or above 59 81.9 19 ft to 20 ft 14 19.4 19 ft or above 43 59.7 20 ft to 21 ft 6 8.3 20 ft or above 29 40.3 21 ft to 22 ft 3 4.2 21 ft or above 23 31.9 22 ft to 23 ft 4 5.6 22 ft or above 20 27.8 23 ft to 24 ft 3 4.2 23 ft or above 16 22.2 24 ft to 25 ft 3 4.2 24 ft or above 13 18.1 25 ft to 26 ft 2 2.8 25 ft or above 10 13.9 26 ft to 27 ft 1 1.4 26 ft or above 8 11.1 27 ft to 28 ft 2 2.8 27 ft or above 7 9.7 28 ft to 29 ft 0 0.0 28 ft or above 5 6.9 29 ft to 30 ft 1 1.4 29 ft or above 5 6.9 30 ft to 31 ft 1 1.4 30 ft or above 4 5.6 31 ft to 32 ft 1 1.4 31 ft or above 3 4.2 32 ft to 33 ft 0 0.0 32 ft or above 2 2.8 33 ft to 34 ft 0 0.0 33 ft or above 2 2.8 34 ft to 35 ft 1 1.4 34 ft or above 2 2.8 35 ft to 36 ft 0 0.0 35 ft or above 1 1.4 36 ft to 37 ft 0 0.0 36 ft or above 1 1.4 37 ft to 38 ft 0 0.0 37 ft or above 1 1.4 38 ft to 39 ft 1 1.4 38 ft or above 1 1.4

Height Above Flood Stage After Datum Change Height Above FS Total Occurence Percent of Crest Occurrence Cumulative Total Flood Occurrence Percent of Floods above Listed Value 17 ft to 18 ft 9 16.1 17 ft or above 56 100.0 18 ft to 19 ft 15 26.8 18 ft or above 47 83.9 19 ft to 20 ft 11 19.6 19 ft or above 32 57.1 20 ft to 21 ft 5 8.9 20 ft or above 21 37.5 21 ft to 22 ft 1 1.8 21 ft or above 16 28.6 22 ft to 23 ft 4 7.1 22 ft or above 15 26.8 23 ft to 24 ft 3 5.4 23 ft or above 11 19.6 24 ft to 25 ft 3 5.4 24 ft or above 8 14.3 25 ft to 26 ft 1 1.8 25 ft or above 5 8.9 26 ft to 27 ft 1 1.8 26 ft or above 4 7.1 27 ft to 28 ft 0 0.0 27 ft or above 3 5.4 28 ft to 29 ft 0 0.0 28 ft or above 3 5.4 29 ft to 30 ft 1 1.8 29 ft or above 3 5.4 30 ft to 31 ft 1 1.8 30 ft or above 2 3.6 31 ft to 32 ft 0 0.0 31 ft or above 1 1.8 32 ft to 33 ft 0 0.0 32 ft or above 1 1.8 33 ft to 34 ft 0 0.0 33 ft or above 1 1.8 34 ft to 35 ft 0 0.0 34 ft or above 1 1.8 35 ft to 36 ft 0 0.0 35 ft or above 1 1.8 36 ft to 37 ft 0 0.0 36 ft or above 1 1.8 37 ft to 38 ft 0 0.0 37 ft or above 1 1.8 38 ft to 39 ft 1 1.8 38 ft or above 1 1.8

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: 09:52 AM May 13, 2013