Browsing by Author "Larson, Steven P."

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Computer Program for Statistical Analysis of Annual Flood Data by the Log-Pearson Type III Methods
    (Water Resources Research Center, University of Minnesota, 1971-07) Bowers, C. Edward; Larson, Steven P.; Pabst, Arthur
    The Federal Water Resources Council has recommended the adoption of the Log-Pearson Type III method of establishing flood flow frequencies. The computer program developed in this study was written in Fortran IV language to facilitate Log-Pearson Type III method computations. Annual floods are sorted in decreasing magnitude and then logarithms, mean, standard deviation and skewness of the logarithms are computed. The magnitude of the 100, 50, etc., year flood are determined with the aid of tables. The initial computer printout consists of sorted values of the floods, empirical values of recurrence interval and probability, and the logarithms of the floods. Application of the method to selected streams in the United States indicates that difficulties may be encountered when a given set of data contains one or more very low floods or outliers. The Log-Person Type III distribution appears to have a substantial advantage over the Gumble and log-normal distributions that have been used for flood frequency analysis because it can be used for data having either a plus or a minus skewness. Also, it reduces to the log-normal distribution for zero skewness where the data fit this distribution. However, it will require a data screening procedure and sufficient use to indicate desirable restrictions on skewness values for short records and perhaps for various regions.
  • Thumbnail Image
    Item
    Computer Programs in Hydrology
    (Water Resources Research Center, University of Minnesota, 1972-01) Bowers, C. Edward; Larson, Steven P.; Pabst, Arthur
    Many computer programs in the field of hydrology are developed each year and are playing an increasingly important part in both research and design activities in hydrology. Many of these programs are available for use by other agencies, organizations, and individuals. The study of which this report is a part was undertaken to review available programs in hydrology and to provide information on representative programs. Information ranging from the title only of the program to listings, source decks, and documentation was reviewed for about 200 programs. Of these, 25 were selected for operation on a CDC 6600 computer and/or preparation of an abstract. The report discusses problems associated with adapting programs to a given computer and with understanding the technical procedure on which the program was based.
  • Thumbnail Image
    Item
    Computer Programs in Hydrology
    (St. Anthony Falls Hydraulic Laboratory, 1972-01) Bowers, C. Edward; Pabst, Arthur; Larson, Steven P.
    Many computer programs in the field of hydrology are developed each year and are playing an increasingly important part in both research and design activities in hydrology. Many of these programs are available for use by other agencies, organizations, and individuals. The study of which this report is a part was undertaken to review available programs in hydrology and to provide information on representative programs. Information ranging from the title only of the program to listings, source decks, and documentation was reviewed for about 200 programs. Of these, 25 were selected for operation on a CDC 6600 computer and or preparation of an abstract. The report discusses problems associated with adapting programs to a given computer and with understanding the technical procedure on which the program was based.