DEPARTMENT OF THE INTERIOR
U. S. GEOLOGICAL SURVEY
BY B. A. MORGAN, G. IOVINE, P. CHIRICO, AND G. F. WIECZOREK
OPEN-FILE REPORT 99-518
1999
This report is preliminary and has not been reviewed for conformity with U. S. Geological Survey editorial standards (or with the North American stratigraphic code). Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U. S. Government.
Abstract:
In August 19/20, 1969 71 cm of rain fell in the Nelson County area of Virginia. The intense debris and floods that followed extensively damaged roads, bridges, communication systems, houses, farms, and livestock, as well as taking 150 lives. This inventory is of the debris flows and floods which are digitally based, and are derived from aerial photography collected August 25, 1969 and April 27, 1971. This study was undertaken to provide a basis for detailed analysis of both terrain and failure sites using GIS techniques not available to earlier studies.
Purpose:
The analysis will provide data for a model for the Appalachian Mountains of central Virginia that will address problems of location, recurrence, and conditions leading to the triggering of debris flows.
Supplemental_Information:
The damage incurred in Nelson County, VA in August 1969 was the result of an eight-hour stall of Hurricane Camille. Since 1969, Virginia has experienced other devastating floods in other locations other than Nelson County. The authors of this project (Morgan, Wieczorek, and others) have had opportunity to continue their GIS research techniques in these areas (i.e., Madison County, 1995).
Digital Compilation Method:
Data was gathered from aerial photographs (1969, 1972),transferred to mylar overlaying a stable base maps of the Lovingston, VA and Horseshoe Mountain, VA 7.5' topographic quadrangles. The mylar was scanned and imported into ARCINFO where it was digitally edited into layers of debris flows and flood effects. Digital raster graphics (DRGs) were used as the base-maps for plots of the debris flows and flood effect.
Digital Data Provided:
Other Items provided:
Adobe Acrobat can be downloaded free here. Acrobat Reader version 4.0 is required to display this (.pdf) file. An Acrobat(.pdf) file of completed map is available here. A screen viewable version of the map is available as a .jpg file here.
Use_Constraints:
Although all data and software released have been used by the USGS no warranty, expressed or implied, is made by the USGS as to accuracy of the data and related materials or the functioning of the software. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government.
Point of Contact:
Contact person: Pete Chirico, GIS Manager
Contact_Address:
U.S. Geological Survey National Center,
MS 926A 12201
Reston, VA 20192
Country: U.S.A.
Contact e-mail: pchirico@usgs.gov
Hours_of_Service: 9:00 am - 5:00 pm, Monday - Friday
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