Report title: Techniques for estimating flood depths for Oklahoma streams
Report number: WRI 2-76
Authors: W.O. Thomas, Jr.
Abstract
Regional relations are defined for estimating the depths of floods
having recurrence intervals ranging from 2 to 100 years for both
natural and urban streams in Oklahoma. Contributing drainage area and
the 2-year 24-hour rainfall are the only independent variables
required for estimating flood depths for natural streams. For urban
stremas the percentage of the basin impervious and served by storm
sewers is also required. The only limitations are that the stream be
unregulated, that the main channels be unimproved, and that the
contributing drainage area and the 2-year 24-hour rainfall be in the
range of values used to derive the relations. The standard errors of
estimate range from 24 percent for the 50- and 100-year floods to 33
percent for the 2-year flood for the natural streams. The estimation
error for urban streams is not evaluated due to paucity of data.
Although the flood depths estimated from techniques presented in this
report are considered less reliable than those obtained from field
surveys and hydraulic computations, the ease and simplicity of their
determination are expected to make them useful for many purposes.
Data on flood depths for 132 gaging stations are given in table 1.
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Last modified: Mon May 24 15:41:06 1999