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<br />CONTENTS
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<br />BACKGROUND AND METHODOLOGy..........,.....,.,..........."...,............, ..........,.,.,..,......... ........1
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<br />Regulation of Alluvial Fans ,.,.,.,...,......,.,.,.,. ....,...,.".,.,.,........................,...,., ,.... ,.,..,............1
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<br />Need for Definition and Classification,.... .........................................,.,............,..,... ........ ,...2
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<br />Study Methodology...,...,.,.,........,.....,.,..............,.,.,.,.,...............,.,........, .......,.........,... ..........2
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<br />SURVEYS AND RESEARCH .,.,.,.,.,.,.,.,.,.,..............,.,.,.......................,.,.,......,.,...,.,.,.....,.,.., ........3
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<br />Survey of California Counties .,.....................,...,.......,............................, ,... ,. ,.. ........., ,.,......3
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<br />Survey of Other Agencies......,....,.,.",.,.,.,......,.,.,.,.........,.,.,.,.,.,.,....,.,.,.,.,..........".,..............3
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<br />Other Investigations and Research,.,.,.,...,..................,...,.,.,.,...,...,.".,.,..........."."................ 3
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<br />DEVELOPMENT OF CLASSIFI CATION SYSTEM..,................."...............,...,.......................,..3
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<br />Definition of an Alluvial Fan ................................. ,....... ..............,. ....... ......, ........................3
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<br />Steps for Identifying and Classifying Alluvial Fans.........,..................................................4
<br />Step 1. Recognize and Characterize the Alluvial Fan,.................,..........................4
<br />Step 2. Determine the Activity and Stability of the Alluvial Fan..,........................5
<br />Step 3. Apply Methods to Define the Flooding Classification
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<br />on the Alluvial Fan.,.,.,.,....,.,.,.,.,.,.....,...,.....,.,.,.,.,........,....,.,.........,..........,.6
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<br />Base Classification System .,.,.,...,.,.,...,.,..........,.,.........,.....,.,...,.,..........,.,..,.,......................8
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<br />APPLI CATION TO LAND USE............,........................,.,...,.,.,.,.,.,.,........,.,.,.,."..........,.,..,....,...,.8
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<br />Planning New Development..,.,.,.....,...................... ,.....,...,.,.,.........,......,...,..,.,......,.........,...8
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<br />Managing Existing Development,.,...,......,.,.,...............,.,.,...,...,..........,.,..."...,....,.,..,.,..,.. .11
<br />Adopting and Enforcing Regulations.,.,....,.,. .......... ................,...,..........,.,...,..,................ ..12
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<br />TEST APPLI CATION...........,.......................,.,.".,.,...,...,. ,...,.... ,........,.,.,.,........,...".,.................. ..12
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<br />Sample Assessment Studies...............,...... ,...,..... ,... ..........,.........,.,...,....,.,....,.,................. .12
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<br />Results and Conclusions......,.,.,..........,.,.,. ,..... ................................,......,.,.,................,..... .13
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<br />RECOMMENDATIONS.......,.,.,.......,...,.,........,.,... .... ...... .......,..................,.,.,...........,................. .13
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<br />FUTURE WORK/STUDIES..................."...,.,.,... ,........................,...,.,..........,.,..,.,.,..,........".,..... .14
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