In cooperation with the Texas Department of Transportation
Extreme Precipitation Depths for Texas, Excluding the Trans-Pecos Region
By Jennifer Lanning-Rush, William H. Asquith, and Raymond M. Slade, Jr.
U.S. Geological Survey
Water-Resources Investigations Report 98–4099
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Contents
Abstract
Introduction
Purpose and Scope
Previous Studies and Extreme Storm Data
Extreme Precipitation Depths for Texas
Selected References
Figures
1. |
Map showing climatic regions of this report and of the National Weather Service, Texas | |
2–13. |
Graphs showing extreme precipitation curve for the: | |
2. |
1-day storm in the High Plains and Low Rolling Plains climatic region of Texas | |
3. |
3-day storm in the High Plains and Low Rolling Plains climatic region of Texas | |
4. |
2-day storm in the North Central climatic region of Texas | |
5. |
4-day storm in the North Central climatic region of Texas | |
6. |
1-day storm in the Edwards Plateau climatic region of Texas | |
7. |
3-day storm in the Edwards Plateau climatic region of Texas | |
8. |
5-day storm in the Edwards Plateau climatic region of Texas | |
9. |
2-day storm in the South Texas, South Central, and Lower Valley climatic region of Texas | |
10. |
4-day storm in the South Texas, South Central, and Lower Valley climatic region of Texas | |
11. |
6-day storm in the South Texas, South Central, and Lower Valley climatic region of Texas | |
12. |
2-day storm in the East Texas and Upper Coast climatic region of Texas | |
13. |
4-day storm in the East Texas and Upper Coast climatic region of Texas | |
Tables
| 1. |
Descriptions of notable and extreme storms in Texas |
2. |
Summary of notable and extreme storms in Texas |
Abstract
The U.S. Geological Survey, in cooperation with the Texas Department of Transportation, conducted a study of extreme precipitation depths for various durations and storm areas for Texas, excluding the Trans-Pecos region. The extreme precipitation depth is an estimate, from documented storms, of the largest precipitation depth expected to occur over a given area. The extreme precipitation depth exceeds the precipitation depth associated with recurrence intervals greater than 100 years.
Storm durations of 1, 2, 3, 4, 5, and 6 days were investigated for this report. The extreme precipitation depth for a particular area is estimated from an “extreme precipitation curve” (an upper limit or envelope curve developed from graphs of extreme precipitation depths for each climatic region). The extreme precipitation curves were determined using precipitation depth-duration information from a subset (24 “extreme” storms) of 213 “notable” storms documented throughout Texas. The extreme precipitation curves can be used to estimate extreme precipitation depth for a particular area. The extreme precipitation depth represents a limiting depth, which can provide useful comparative information for more quantitative analyses.
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