Magnitude and frequency of floods from drainage areas less than 100 square miles in Montana
By: by F.C. Boner and R.J. Omang
Contributors: Omang, R. J.; Geological Survey (U.S.); Montana. State Highway Commission; United States. Bureau of Public Roads
Publisher: [s.n.]
Published: 1967
Place of publication: Helena, Mont
Language: eng
Number of pages: 23
Subjects: Floods; Drainage
Other titles: United States Department of the Interior, Geological Survey
Description: A method is presented for determining the magnitude of floods with 10- and 25-year recurrence intervals from drainage areas of less than 100 square miles in Montana.  Curves express the relation of the 10-year flood to basin characteristics.  In most of the mountainous areas of Montana, size of drainage basin and average annual runoff were found to be important factors in determining the magnitude of the 10-year flood.  Only sixe of drainage basin was used as an independent variable in the remainder of the State.  Ratios between the 25-year flood and the 10-year flood are given for each of the 13 regions so that the 25-year flood can be obtained by multiplying the 10-year flood by the appropriate ration.  The relations are based on 5 or more years of record at gauging stations on streams that are virtually unregulated.
Notes: "Prepared in cooperation with the Montana State Highway Commission and the U.S. Bureau of Public Roads."

"Open-file report."

Includes bibliographical references.
Table of contents: title: Abstract; title: Introduction; title: Description of the State; title: Flood-frequency relations; title: Application of flood-frequency relations; title: Limitations; title: References cited.