Research Article
Jan 1961
Flood-Frequency Relationships in the Pacific Northwest
Publication: Transactions of the American Society of Civil Engineers
Volume 126, Issue 1
Abstract
This paper describes, in general terms, a method of determining the magnitude and frequency of expected floods that is applicable to any area in the Pacific Northwest of the United States. The development of a composite frequency curve applicable to any site in a large homogeneous region is examined, and the effect of mean elevation and size of drainage area on the shape of the frequency curves in designated parts of the Pacific Northwest is demonstrated. A formula for determining the mean annual flood for any site on the west side of the Cascade Range in Washington is shown, and the drainage-basin characteristics used in its derivation are listed. A floodfrequency curve can be drawn for any given site in the Pacific Northwest by combining the results obtained from the mean annual flood formula and the composite frequency curve that are both applicable to that site. Comments about limitations on the use of results obtained by this method are included.
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© 1961 American Society of Civil Engineers.
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Published in print: Jan 1961
Published online: Feb 10, 2021
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George L. Bodhaine, M.ASCE
Flood Specialist, U.S.G.S., Tacoma, Wash., USA.
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Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
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