Files in each directory generally adhere to the following naming conventions:

Files ending with extension .dxf were created with the arcdxf
command in Arc/Info, are in data exchange format
and are importable to AutoCad.

Files ending with extension .e00 were created with the export
command in Arc/Info and are importable to Arcview. 

Most directories contains the following files:
*******----------------------------------------********* 
cont_x.dxf and cont_x.e00: where x can = 2, 5, or 10 foot contours.

cont_anno, lake abbreviated names plus "ano", cont_txt.dxf and 
cont_txt.e00 all are contour annotations. Other forms may appear.

<abbreviated lake name>_lk.dxf and .e00: lake boundary typically at conservation
pool elevation.
Most boundaries were digitized from USGS 7.5min topo sheets. Beginning
in October 1998 when available the lake boundary is digitized from  
Digital Ortho Quads (found at www.tnris.state.tx.us)

<abbreviated lake name>.gen: x,y,z data points collected during the
TWDB Volumetric Survey.
Data are in Arc/Info generate format (i.e., a leading "1", easting coordinate(ft),
northing coordinate(ft), elevation(ft).

elev_area_vol: elevation-area-volume data in columnar ascii text
format, obtained from TWDB GIS analysis.

area_table: ascii text in tabular format (area in acres).

volume_table: ascii text in tabular format (volume in acre-feet).

*******----------------------------------------********* 
All elevation are based on USGS Gage Datum. Projection info can be obtained from
the lake boundary coverage using the DESCRIBE command.

Example:

Projection           STATEPLANE
Zone                       5351 (North Central Zone)
Datum                     NAD83
Units                      FEET             Spheroid                GRS1980


rburns 04/06/2000