United States Department of Transportation
i
Technique for estimating the magnitude and frequency of floods in Texas.
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1977
[PDF-2.93 MB]
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Abstract:Drainage area, slope, and mean annual precipitation were the only
factors that were statistically significant at the 95-percent confidence
level when the characteristics of the drainage basins were used as independent variables in a multiple-regression flood-frequency analysis of
natural, unregulated streams in Texas. The State was divided into six
regions on the basis of the distribution of the residuals from a single
statewide regression of the 10-year flood. Equations were developed for
predicting the magnitude of floods with recurrence intervals of 2, 5, 10,
25, SO, and 100 years in each of the six regions. These equations are
applicable to unregulated rural streams with drainage basins ranging in area
from 0.3 square mile to about 5,000 square miles in some regions. Regression equations were not developed for several areas, particularly in south
Texas, because of the lack of definition of the flood-frequency characteristics.
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