Appomattox River at Mattoax, Chesterfield County VA (MTXV2)
Gage Location: Chesterfield County, Virginia	Site Location: Amelia County, Virginia
Latitude: 37.421	Longitude: -77.859	Elevation: 174.51 ft. MSL	Drainage Area: 725 Sq. Mi.
Minor Stage: 21 ft.	Moderate Stage: 25 ft.	Major Stage: 28 ft.
First Flood: 1901-05-25	Last Flood: 2013-01-21 Crest: 21.04 ft.	Datum change: 1936-10-01	Number of Floods: 79

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Month Number of Floods After Datum Number of Floods Total Cumulative Total After Datum Cumulative Total January 11 11 11 11 February 9 10 20 21 March 10 14 30 35 April 8 8 38 43 May 1 2 39 45 June 3 3 42 48 July 2 2 44 50 August 2 3 46 53 September 8 8 54 61 October 6 6 60 67 November 4 4 64 71 December 7 8 71 79 Seasonal Totals Winter (Dec-Jan-Feb) 29 Spring (Mar-Apr-May) 24 Summer (Jun-Jul-Aug) 8 Fall (Sep-Oct-Nov) 18

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