ReadMe.txt

West Virginia Approximate Zone A HEC-RAS Model Data Download
Data were created by FEMA or WV State NFIP mapping contractors.
This ReadMe file was created by the West Virginia GIS Technical 
Center (WVGISTC).

Description
The files in this download package contain raster digital 
elevation models (DEM) for Approximate Zone A streams, buffer 
polygons matching stream DEM's, stream HEC-RAS models, and shapefiles 
of cutlines and county-wide streams, if available, for select 
West Virginia counties.  The stream DEM's were extracted by the 
mapping contractor from a countywide subset of the USGS National 
Elevation Dataset (NED). This download package was compiled by the 
WVGISTC.

Purpose
This data package may be useful to surveyors and/or engineers 
seeking to create local base flood elevations (BFE). BFEs so 
created may be a valuable contribution to Letters of Map Change 
(LOMC), including Letters of Map Amendment (LOMA) and Letters of 
Map Revision (LOMR). Some advanced knowledge, expertise and 
specialized software applications are required in order to use 
the included data.

Flood Tool Model data download package:

Folders File Name
	Path & File Type
	Data included & Description

1. stream_DEM 
	CountyName\Stream_DEM\ (Raster)
	Digital elevation model for a particular stream,
	including a buffer area of approximately 2000 feet
	out from the stream line, labled and stored by 
	stream name.

2. stream_DEM_Buffer (Vector)
	CountyName\Stream_DEM_Buffer\StreamName_Buf.shp (shapefile)
	Stream DEM with a buffer of approx. 2000 feet applied to 
	it, stored as a polygon vector feature. The outline or 
	boundary of the stream DEM.

3. stream_HEC_RAS_Model
	CountyName\Stream_HEC_RAS_Model\StreamName
	HEC-RAS Project (.prj Careful! This is not a projection file) 
	includes:
	- Unit system (SI/US customary)
	- Geometry (XS, bridges, weirs, etc.) (.g file)
	- Flow Data (steady, unsteady) (.f file)
	- Plan data (what combination of flow/geometry to use for the 
	  analysis) (.p file)

	This data is compatable with and meant for use in
	HEC-RAS 4.1.0.

4. Other_Data
 4a. Streams
	CountyName\Other_Data\Stream_mmddyy.shp (Shapefile) 
	Countywide vector polyline representations of stream features.

 4b. XSCutlines
	CountyName\Other_Data\XSCutlines_Model_ddmmyy.shp (Shapefile)
	Polyline representations of cutlines, or cross section lins,.

5. Metadata 
	CountyName\Metadata.xml (XML)
	This has information and attributes about the data, how it is
	collected, processed, and distributed,as well as contact
	information.

6. Read Me
	CountyName\ReadMe.txt (TXT) 
	This is a text file summary of all data in package.

