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<br />CONTENTS <br /> <br />Page <br /> <br />Preface ___________ ._____~____ _______________ III <br />Abstract n_______ ___________u___________n 1 <br />Introduction _______~___________ ________~____ 1 <br />Procedure for flood peaks ~_______._______~____ 2 <br />Index-tlood method __~____ _____un_nun 2 <br />Multiple-regression method _______u____n 2 <br />Regionalization of characteristics of the <br />frequency distribution _______._____~____ 6 <br />Use of short records on small streams_____ 7 <br />Defining the flow characteristic __________ 7 <br />Model and parameters u_____ _. __________ 9 <br />Reliability of a regionalization ___________ 11 <br /> <br />Page <br /> <br />Regionalizing flood stages ____n_____________ 11 <br />Procedures for other flow characteristics__._____ 12 <br />Regionalizing draft-storage relations ______u_ 13 <br />Alternatives to regionalization ___u____n_. 13 <br />Channel-geometry method u_n__ __nn n 13 <br />Mean flow from monthly measurements__n 13 <br />Defining mean runoff by elevation zonesuu 13 <br />Low-flow characteristics from base-flow <br />measurements nn______unn__ ____.__ 14 <br /> <br />References ___n__n_____________n____n__n 14 <br /> <br />FIGURES <br /> <br />Page <br /> <br />1. Graphical analysis of data from table 1 nn_UUnn__un__n_____________ 4 <br />2. Map of Snohomish River stream system showing location of gaging stations <br />listed in table 1 _n_______________nn____n__n___nn__n______nu_u__ 5 <br />3. Plot of computed floods for hypothetical basins ______n_ __n__u_nnn~____ 6 <br />4. Graphical regression of lO-year floods defined from short records, <br />Kootenai River basin, :Montana nnn____n____n____u______u__u_u______ 8 <br /> <br />TABLES <br /> <br />Page <br />1. Data from Snohomish River basin, Washington. n________U__n____________ 3 <br />2. Independent variables used in 10 regional flood-frequency analysesu_u____n_ 10 <br /> <br />v <br />