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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />1 <br /> <br />07/16/99 <br /> <br />CONTENTS <br /> <br />1 Introduction <br /> <br />2 Approach 4 <br /> <br />3 Stage 1: Recognizing and Characterizing Alluvial Fan Landfonns 6 <br />3A Composition, 6 <br />3B Morphology, 6 <br />3C Location, 6 <br />3D Boundaries of an Alluvial Fan, 7 <br />30(1) Toc, 7 <br />30(2) Lateml Boundaries, 7 <br /> <br />4 Stage 2: Defining Active and Inactive Areas 7 <br />4A Identification of Active Areas, 8 <br />4B Identification of Inactive Areas, 9 <br />4C Identification Process, 9 <br />4D Types of Alluvial Fan Flooding, 10 <br />40(1) Flooding Along Stable Channels, 10 <br />40(2) Sheetflow, 10 <br />40(3) Debris Flow, II <br />40(4) Unstable Flow Path Flooding, 11 <br /> <br />5 Stage 3: Defining the 100-Ycar Flood Within the Defined Area II <br />5A Risk-Based Analysis, 13 <br />5B FAN Program, 13 <br />5C Sheetflow, 17 <br />50 Hydmulic Analytical Methods, 17 <br />5E Geomorphic Data, Post-Flood Hazard Verification, and Historical <br />Information, 18 <br />5F Composite Methods, 19 <br /> <br />6 Additional Information 19 <br />6A Sediment Tmnsport, 19 <br /> <br />7 Bibliography and Rcfcrcnces 22 <br />