Hydrogeology and Simulation of Ground-Water Flow and Land-Surface Subsidence in the Chicot and Evangeline Aquifers, Houston Area, Texas
Kasmarek, Mark C. and Eric W. Strom
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In November 1997, the U.S. Geological Survey, in cooperation with the City of Houston's Utilities Planning Section and the City of Houston's Department of Public Works & Engineering began an investigation of the Chicot and Evangeline aquifers in the greater Houston area to better understand the hydrology, flow, and associated land-surface subsidence. As part of the investigation, a numerical model was developed to simulate ground-water flow and land-surface subsidence in the greater Houston area.The study area covers 18,100 square miles. The finite-difference grid used in the numerical model encompasses all of Brazoria, Chambers, Fort Bend, Galveston, Harris, Liberty, and Waller Counties and parts of Austin, Colorado, Fayette, Grimes, Hardin, Jefferson, Matagorda, Montgomery, Polk, San Jacinto, Walker, Washington, and Wharton Counties. The focus of the study is Harris and Galveston Counties, but the other counties were included to achieve the appropriate boundary conditions. Each grid layer consists of 103 rows and 109 columns. The model was vertically discretized into three layers resulting in a total of 33,681 grid cells. Layer 1 represents the water table using a specified head layer, layer 2 represents the Chicot aquifer, and layer 3 represents the Evangeline aquifer.