Abstract:
This data release provides the source data and results of a flood frequency analysis and annual exceedance probability estimation for a flood that occurred on June 22, 2020 in the Fortymile River Basin, Alaska. Data are provided for two streamgages that had at least 10 years of peak-flow record. The data include streamgage information, PeakFQ input (.txt and .PSF files) PeakFQ output (.PRT, .EXP, and .JPEG files), flood frequency parameters, flood frequency estimates for the 50-, 20-, 10-, 4-, 2-, 1-, 0.5-, and 0.2-percent annual exceedance probabilities, and annual exceedance probability estimates for the flood of interest. These data were intended to support investigations of streamflow in the Fortymile River Basin.
Purpose:
Estimates of the magnitude and frequency of floods are needed for engineering design of transportation and water-conveyance structures, flood-insurance studies, flood-plain management, and other water-resource purposes. Previously, the U.S. Geological Survey estimated flood frequency and magnitude for selected streamgages in Alaska and conterminous basins in Canada and developed methods for estimating flood frequency and magnitude at ungaged streams (Curran and others, 2016; available at
https://doi.org/10.3133/sir20165024 ). More current estimates of flood frequency are often needed for water-resource purposes, including estimating the annual exceedance probability of an observed flood peak. The U.S. Geological Survey, in collaboration with the Bureau of Land Management, has computed updated estimates of flood frequency through water year 2020 and annual exceedance probability for the June 22, 2020 flood for two streams in the Fortymile River Basin using methods and information documented in Curran and others (2016).
Theme:
Theme_Keyword_Thesaurus: USGS Metadata Identifier
Theme_Keyword: USGS:ASC446
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: InlandWaters
Theme:
Theme_Keyword_Thesaurus: NASA GCMD Earth Science Keyword Thesaurus
Theme_Keyword: Terrestrial Hydrosphere
Theme_Keyword: Rivers/streams
Theme_Keyword: Drainage
Theme:
Theme_Keyword_Thesaurus: USGS Thesaurus
Theme_Keyword: Hydrographic datasets
Theme_Keyword: Hydrology
Theme_Keyword: Streamflow
Theme_Keyword: Floods
Theme_Keyword: Hazards
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System (GNIS)
Place_Keyword: Alaska
Place_Keyword: Fortymile River
It is requested that the authors and the USGS Alaska Science Center be cited for any subsequent publications that reference this dataset.
Citation_Information:
Originator: Curran, J.H.
Originator: Barth, N.A.
Originator: Veilleux, A.G.
Originator: Ourso, R.T.
Publication_Date: 2016
Title:
Estimating flood magnitude and frequency at gaged and ungaged sites on streams in Alaska and conterminous basins in Canada, based on data through water year 2012
Geospatial_Data_Presentation_Form: publication
Series_Information:
Series_Name: U.S. Geological Survey Scientific Investigations Report
Issue_Identification: 2016–5024
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
Curran, J.H., Barth, N.A., Veilleux, A.G., Ourso, R.T. 2016. Estimating flood magnitude and frequency at gaged and ungaged sites on streams in Alaska and conterminous basins in Canada, based on data through water year 2012. U.S. Geological Survey Scientific Investigations Report 2016–5024. doi:10.3133/sir20165024
Online_Linkage: https://doi.org/10.3133/sir20165024