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<br />. <br />. <br />,. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />:. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />. <br />I. <br />. <br />I- <br />. <br />I. <br />. <br />. <br />'. <br />- <br /> <br />02/23/00 <br /> <br />CONTENTS <br /> <br />I Introduction I <br />2 Approach 4 <br />3 Stage I: Recognizing and Characterizing Alluvial Fan Landforms 6 <br />3A Composition 6 <br />3B Morphology 6 <br />3C Location 6 <br />3D Boundaries of an Alluvial Fan 7 <br />3D(1) Toe 7 <br />3D(2) Lateral Boundaries 7 <br />4 Stage 2: DefIning Active and Inactive Areas 7 <br />4A IdentifIcation of Active Areas 8 <br />4B IdentifIcation ofInactive Areas 9 <br />4C IdentifIcation Process 9 <br />4D Types of Alluvial Fan Flooding 10 <br />4D(I) Flooding Along Stable Channels 10 <br />4D(2) Sheetflow 10 <br />4D(3) Debris Flow 11 <br />4D( 4) Unstable Flow Path Flooding 11 <br />S Stage 3: Defining the 100. Y ear Flood Within the DefIned Area I 1 <br />SA Risk.Based Analysis 13 <br />SB FAN Program I3 <br />SC Sheetflow 17 <br />SD Hydraulic Analytical Methods 17 <br />5E Geomorphic Data, Post-Flood Hazard VerifIcation, and Historical <br />Information 18 <br />SF Composite Methods 19 <br />