Hickory Aquifer I Water Development Board http://www.twdb.state .tx. us/groundwater/aqui for /minors/hickory.ass:

Texas Water~ Development Board Sustainable, affordable, quality water for Texans, our economy, and our environment.

The Texas Water Development Board has a new website address: www.twdb.texas.gov. Although the old website address (www.twdb.state.tx.us) will work for some time, please update your bookmarks soon to help ensure that you do not encounter broken links.

Hickory Aquifer interactive map I cross-section

Summary

The Hickory Aquifer, a minor aquifer found in the central part of the state, consists of the water-bearing parts of the Hickory Sandstone Member of the Riley Formation. The Hickory Aquifer reaches a maximum thickness of 480 feet, and freshwater saturated thickness averages about 350 feet.

Although the groundwater is generally fresh, with total dissolved solids concentrations of less than i,ooo milligrams per liter, the upper portion of the aquifer typically contains iron in excess of the state's secondary drinking water standards. Of greater concern is naturally occurring radioactivity: gross alpha radiation, radium, and radon are commonly found in excess of the state's primary drinking water standards.

The groundwater is used for irrigation throughout its extent and for municipal supply in the cities of Brady, Mason, and Fredericksburg. Slight water level fluctuations occur seasonally in irrigated areas.

Reports

Search Table: I Skip to Table

ID II Date II Type II Description TWDB IR-380 numbered !Aquifers of Texas IEJ report I ~2/9/2004 j:'i!'!red Conference Proceedings: Aquifers of the IR-360 report 1WDB 11 numbered The Paleozoic and Related Aquifers of IR-346 113/ / 996 1 report 1WDB Evaluation of Ground-Water Resources of the Paleozoic and numbered 1 Cretaceous Aquifers in the Hill Country of Central Texas IB= 118/1/1992 report

Occurrence, Availability, and Chemical Quality of Ground .. d Water in the Edwards Plateau Region of Texas I&= l~/1/1979 1~:!report

I oD 3/31/20124:18 p~ Hickory Aquifer I Texas Water Development Board http://www.twdb.state.tx.us/groundwater/aquifer/minors/hickory.asp

ID II Date II Type II Description 1WDB 117/1/1973 Inumbered Ground-Water Resources of Blanco County, Texas 1Bill4 report 1WDB Occurrence and Quality of Ground Water in Coleman County, numbered 119/1/1967 I Texas l&Qsz report Desired future conditions for the Edwards Group of the GMA9 DFC 01 8/29/2008 DFC submission Edwards-Trinity (Plateau), Ellenburger-San Saba, Hickory, and Marble Falls aquifers Desired future conditions for the Blossom, Brazos River Alluvium, Edwards (Balcones Zone), Ellen burger-San GMAB DFC 05 4/27/2011 DFC submission Saba, Hickory, Marble Falls, Nacatoch, Trinity, and Woodbine aquifers DFC b . . Desired future conditions for the Ellenburger-San Saba, DFC 02 su m1ss1on . . IGMA8 15/19/2008 Hickory, and Marble Falls aqmfers Desired future conditions for the Capitan Reef Complex, GMAz DFC 01 7/29/2010 DFC submission Dockum, Edwards-Trinity (Plateau), Ellenburger-San Saba, Hickory, Lipan, Marble Falls, Ogallala, and Rustler aquifers

I Groundwater Ground-Water Conditions in Menard County, Texas IB-6519 lls/1/1965 bulletin I Groundwater Ground-Water Geology of the Hickory Sandstone Member of IB-601z 112/1/1961 bulletin the Riley Formation, McCulloch County, Texas

I Groundwater Geology and Ground-Water Resources of Hays County, Texas IB-6004 118/1/1960 bulletin Aquifer Draft managed available groundwater estimates for the MAG D 1/25/2011 assessment IAAlo-16 Hickory Aquifer in Groundwater Management Area 8 MAG Aquifer Modeled available groundwater estimates for the Hickory MAG 11/1/2011 assessment IAAlo-11 Aquifer in Groundwater Management Area 7 MAG Aquifer Desired future condition scenarios for the Hickory Aquifer in 9/10/2010 IAA.10-05 assessment Groundwater Management Area 7 Aquifer Managed available groundwater estimates for the Hickory MAG 6/22/2011 assessment IAAlo-02 Aquifer in Groundwater Management Area 9 MAG Aquifer Desired future condition scenarios for the Hickory Aquifer in 8/31/2010 IAAo8-oz assessment Groundwater Management Area 7 Aquifer Managed available groundwater estimates for the Hickory MAG 12/10/2009 assessment IAAoS-o,i Aquifer in Groundwater Management Area 8 MAG

Texas Water Development Board. izoo North Congress Avenue. Austin. TX z8zo1 I TEL: 512-463-7847

• American Recoveiy and Reinvestment Act • TNRIS • Water IO • WIID System • Save Texas Water •TRAIL • Texas Online • 1WICC

2 of3 3/31120124:18 p~ Hickory Aquifer I Texas Water Development Board hup://www.twdb.state.tx.us/groundwater/aquifer/minors/hickory.asr

• Water Exploration

3of3 3/31/20124:18 Pf\