In cooperation with the City of Laredo
Hydrogeology of
Webb County, Texas
By Rebecca B. Lambert
U.S. Geological Survey
Scientific Investigations Report 2004–5022
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Text, figures, and tables are linked
below in the Table of Contents and or the
zipped plates in pdf
Contents
Introduction
Previous Studies
Methods
Acknowledgments
Geologic Setting
Hydrogeology
Gulf Coast Aquifer
Jackson and Yegua Aquifers
Laredo Aquifer
El Pico Confining Unit, Queen City-Bigford
Aquifer, and Reklaw Confining Unit
Carrizo Aquifer
Summary
Figures
1. |
Location of the city of Laredo
and smaller cities in Webb County |
2. |
Location of inventoried and sampled wells |
3. |
Location of geophysical log control points |
4. |
Surface geology of Webb County and location
of geologic sections |
|
5. |
Structural features affecting Tertiary
deposits in Webb County |
6. |
Geologic dip section A–A'
across northern Webb County |
7. |
Geologic dip section B–B'
across southern Webb County |
8. |
Geologic strike section C–C'
in northwest Webb County |
9. |
Geologic strike section D–D'
trending north-south in central Webb County |
10. |
Geologic strike section E–E'
in eastern Webb County |
11. |
Extent of the Gulf Coast aquifer outcrop
and depth of water level in wells, 1996–97 |
12. |
Altitude of the top of the Gulf Coast
aquifer |
13. |
Thickness of the Gulf Coast aquifer |
14. |
Net sand thickness of the Gulf Coast
aquifer |
15. |
Specific capacity and estimated transmissivity
of the Gulf Coast aquifer |
16. |
Chemical characteristics of water from
the Gulf Coast aquifer |
17. |
Extent of the Jackson aquifer outcrop
and subsurface extent of the aquifer |
18. |
Altitude of the top of the Jackson aquifer |
19. |
Thickness of the Jackson aquifer |
20. |
Net sand thickness of the Jackson aquifer |
21. |
Chemical characteristics of water from
the Jackson and Yegua aquifers |
22. |
Extent of the Yegua aquifer outcrop,
subsurface extent of the aquifer, and depth of water level in wells, 1996–97 |
23. |
Altitude of the top of the Yegua aquifer |
24. |
Thickness of the Yegua aquifer |
25. |
Net sand thickness of the Yegua aquifer |
26. |
Extent of the Laredo aquifer outcrop,
subsurface extent of the aquifer, and depth of water level in wells, 1996–97 |
27. |
Altitude of the top of the Laredo aquifer |
28. |
Thickness of the Laredo aquifer |
29. |
Net sand thickness of the Laredo aquifer |
30. |
Specific capacity and estimated transmissivity
of the Laredo aquifer |
31. |
Chemical characteristics of water from
the Laredo aquifer |
32. |
Extent of the Queen City-Bigford aquifer
and El Pico confining unit outcrops, subsurface extent of the Queen City-Bigford
aquifer and El Pico confining unit, and depth of water level in wells completed
in the El Pico confining unit, 1996 |
33. |
Altitude of the top of the El Pico confining
unit |
34. |
Thickness of the El Pico confining unit |
35. |
Altitude of the top of the Queen City-Bigford
aquifer |
36. |
Thickness of the Queen City-Bigford aquifer |
37. |
Net sand thickness of the Queen City-Bigford
aquifer |
38. |
Altitude of the top of the Reklaw confining
unit |
39. |
Thickness of the Reklaw confining unit |
40. |
Extent of the Carrizo aquifer outcrop,
subsurface extent of the aquifer, and depth of water level in wells, 1997–98 |
41. |
Altitude of the top of the Carrizo aquifer |
42. |
Thickness of the Carrizo aquifer |
43. |
Net sand thickness of the Carrizo aquifer |
44. |
Specific capacity and estimated transmissivity
of the Carrizo aquifer |
45. |
Chemical characteristics of water from
the Carrizo aquifer |
Tables
DATUM
Vertical coordinate information is referenced to the National Geodetic Vertical
Datum of 1929 (NGVD 29).
Horizontal coordinate information is referenced to the North American Datum
of 1927 (NAD 27).
