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 streams 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.
|Publication Subtype||USGS Numbered Series|
|Title||Techniques for estimating flood depths for Oklahoma streams|
|Series title||Water-Resources Investigations Report|
|Publisher||U.S. Geological Survey|
|Description||v, 38 p.|
|Google Analytic Metrics||Metrics page|