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<br />I <br />I 07/16/99 <br />6 <br />I <br />I * Is the landform a sedimentary deposit composed of alluviwn or <br /> debris-flow deposits? <br />I (Refer to surficial geologic and soils maps) <br /> Recognizing and * Does the landform have the shape of a fan? <br /> Stage 1 Characterizing ---0 (Refer to topographic maps) <br /> Alluvial Fan . Is the landform located at a topographic break? <br />I Landforms (Refer to topographic maps) <br /> . Where are the lateral boundaries of the fan? <br /> (Refer to topographic and soils maps, surficial geologic maps, and <br />I aerial photographs) <br />I Defining Active and . What parts of the alluvial fan are still active? <br /> . What parts are inactive but subject to flooding? <br />Stage 2 Inactive Areas of ----f (Refer to aerial pbotographs, topographic aod soils <br />Erosion and <br /> Deposotion maps, surficial geologic maps, and historical records in a <br />I preliminary assessment to plan a more detailed field investigation) <br />I . Determine method of analysis (deterministic, probablistic <br /> or geomorphic) based on assumptions, limitations and <br /> Defining the 100- recommended applications. <br /> Stage 3 Year Flood Within ---0 . To what extent and degree is alluvial fan flooding <br />I the Defmed Areas occurring within the defined areas? (Refer to recent aerial <br /> photographs, topographic and soils maps, historical records, and <br /> detailed field mapping to support analysis) <br />I <br />I <br />I Figure 2 <br />I Three Stages of the Process to Identity and Map Alluvial Fan Flooding (Original published in <br /> National Research Council, 1996, Figure 3-1; amended by FEMA) <br />I <br />I <br />I <br />I <br />