Lower Rio Grande Valley Groundwater Transport Model Page: PAGE 18
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MONTGOMERY Conceptual Model Report:
w~j ONTG MERYLower Rio Grande Valley
J & ASSOCIATES Groundwater Transport Model
information on screened interval was available for a well, the well was assumed to
be fully screened to its reported well depth. This comparison resulted in
538 wells having screened intervals completed in a single hydrostratigraphic unit.
Of these wells, 263 wells are completed in the Chicot Aquifer, 197 wells are
completed in the Evangeline Aquifer, 4 wells are completed in the Burkeville
Confining Unit, and 74 wells are completed in the Jasper Aquifer. In addition,
31 wells have screen intervals completed across multiple hydrostratigraphic units.
Fifty-four (54) wells are not included in this evaluation because they lack well
construction information for determining the aquifer they belong to. TWDB
groundwater level data are not available in the study area for the Catahoula
Confining System or the Yegua-Jackson Aquifer.
The spatial distribution of groundwater level measurements for the Chicot
Aquifer, the Evangeline Aquifer, the Burkeville Confining Unit, and the Jasper
Aquifer are shown on Figures 4.2.1 through 4.2.4, respectively. The majority of
wells with groundwater level measurements for the Chicot Aquifer are located in
the southern portions of the valley near the Rio Grande. Most wells penetrating
the Evangeline Aquifer are located in Hidalgo County in the central portions of
the valley. Wells penetrating both the Chicot and Evangeline aquifers are
principally located in the northern portions of the valley. Wells penetrating the
Burkeville Confining Unit and Jasper Aquifer are located principally at or near
their respective outcrop areas in Starr and Jim Hogg counties.
4.2.2 Groundwater Levels and Flow through Time
Depths to groundwater range from at or near the surface along the coastline and
the Rio Grande to about 200 feet in the western portions of the valley. Depths to
groundwater range from 20 to 60 feet across most of the central portions of the
valley.
The water table surface in the valley generally follows the land surface
topography, with higher groundwater level elevations occurring in the upland
areas in the west and northwest (Starr and Jim Hogg counties) and lower
groundwater level elevations occurring in the lowland areas in the east towards
the coastline.
Contours of regional groundwater level elevation were prepared for three time
periods: (1) the early-1980s to represent initial conditions for the groundwater
model transient calibration period; (2) the late-1990s to represent conditions
immediately prior to the start of desalination operations in the valley; and (3)
PAGE 18
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Montgomery & Associates. Lower Rio Grande Valley Groundwater Transport Model, report, June 30, 2017; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth1114946/m1/34/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.