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<br />appropriate as a complementary policy. In undeveloped areas, a wider <br />variety of options is possible. In many cases, avoidance and non-development <br />of such hazardous areas probably will be the Least costly and most <br />effective method of hazard reduction. Detailed analysis of the debris-flow <br />hazard may indicate that specific locations on a debris fan are developable <br />with acceptable risk. Ir.. such a case, a combination of avoidance, <br />calculated placement of improvements, and structural control may be <br />possible. <br /> <br />This publication recommends solution to an existing unfavorable <br />condition related to housing developments in high-hazard areas of <br />three debris fans. By understanding the geologic processes involved, <br />it is possible to decrease this hazard by structural means. Also, <br />by understanding the processes in this and other areas, similar hazardous <br />situations can be avoided in the future through wise land-.use decisions. <br /> <br />Sincerely, <br /> <br />iJ-t.:,. 1{/;" &?/cL <br /> <br />, <br />John W. Rold <br />Director and State Geologist <br /> <br />- Hi - <br />