thumbnail

Historical saturated thickness of the Edwards-Trinity aquifer system and selected contiguous hydraulically connected units, west-central Texas

Water-Resources Investigations Report 92-4125

By:
,

Links

Abstract

The saturated thickness of the Edwards-Trinity aquifer system exceeds 1,000 feet in the southern part of the aquifer system and thins to less than 100 feet near the northern limits. The Edwards- Trinity aquifer system of west-central Texas is composed primarily of Cretaceous limestone and dolomite. The three aquifers comprising the aquifer system are the Edwards aquifer of the Balcones fault zone, the Trinity aquifer of the Balcones fault zone and Hill Country, and the Edwards-Trinity aquifer of the Edwards Plateau and Trans-Pecos. The two confining units within the aquifer system are the Hammett and the Navarro-Del Rio confining units, neither of which is laterally extensive throughout the entire aquifer system. The saturated thickness was determined by subtracting the altitude of the base of the aquifer system from the altitude of the historical potentiometric surface. Variations in saturated thickness result from variations in the altitude of the base of the aquifer and the altitude of the historical potentiometric surface. Troughs and ridges on the pre-Cretaceous surface upon which the aquifer system rests affect the thickness of saturation. The potentiometric surface is depressed in areas of stream dissection, resulting in less saturated thickness in these areas.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Historical saturated thickness of the Edwards-Trinity aquifer system and selected contiguous hydraulically connected units, west-central Texas
Series title:
Water-Resources Investigations Report
Series number:
92-4125
Edition:
-
Year Published:
1993
Language:
ENGLISH
Description:
2 maps on 2 sheets : col. ; 28 x 46 cm. and 58 x 91 cm., both sheets 66 x 92 cm., folded in envelope 31 x 24 cm.