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<br />FIGURE 3-1 Three slages in the procedure to determine areas susceptible 10 alluvial fan flooding. <br /> <br />, <br />: <br />.~ <br />: <br />; <br />, <br /> <br />occurred on the fan in relatively recent time, and probably will continue to occur on that part of <br />the, alluvial fan. Those parts of the fan that have been active in relatively recent time can be <br />identified depending on data availability for the site and money allotted to the project. (See Box 3- <br />1.) Each active part of the alluvial fan also is characterized based on the dominant types of <br />processes that result in flooding and sedimentation. Finally, in Stage 3, the evaluator determines <br />where on those parts of the fan that are active the 100-year flood is possible. Progression through <br />each of these stages will require the investigator to refer to a variety of maps, photographs, and <br />other information sources (Table 3-1; also see Appendix B) and to do a significant amount of <br />fieldwork to understand and characterize the alluvial fan flooding hazard. <br /> <br />'. <br /> <br />.:' <br /> <br />; <br />, <br /> <br />;f: <br /> <br />~. <br /> <br />~ <br />