Development of a geodatabase and conceptual model of the hydrogeologic units beneath air force plant 4 and Naval Air Station-Joint Reserve Base Carswell Field, Fort Worth, Texas

Abstract

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88). Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Two-dimensional resistivity investigation along West Fork Trinity River, Naval Air Station-Joint Reserve Base Carswell Field, Fort Worth, Texas, October 2004

“…However, ground water moves at different rates locally because of the heterogeneous nature of the aquifer, which results in preferred flow paths in the sand and gravel channel deposits. Flow velocities tend to be greater in sand and gravel deposits than in the adjacent clay and silt (Shah, 2004). Thus, ground-water movement probably varies between the two general lithologies of the alluvial aquifer.…”

“…Aspects of the hydrogeology beneath the facility have been described in several recent USGS reports (for example, Kuniansky and others, 1996;Shah, 2004). From oldest to youngest, the Cretaceous rocks that crop out near NAS-JRB are the Paluxy Formation, Walnut Formation, and Goodland Limestone.…”

“…Land-surface altitudes range from about 585 ft above NAVD 88 along the southern boundary of the site to about 610 ft above NAVD 88. The site is drained primarily by the West Fork Trinity River (Shah, 2004).…”

“…The alluvial aquifer at the site consists primarily of clay and silt with sand and gravel deposits and ranges in thickness from about 5 to 25 ft (Shah, 2004, fig. 8).…”

“…The alluvial aquifer is recharged locally by precipitation. A potentiometric-surface map constructed from data collected during fall 2002 (Shah, 2004) indicates ground water flows generally from west to east ( fig. 3).…”