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<br />8 d/ 003183 <br /> <br />~ <br /> <br />/) walv/ Lo~ <br />.J) ~~ ~/~ <br /> <br />~ <br /> <br />oc:! <br /> <br />-- <br />/r /'r;c, <br />'/ '{,J <br /> <br />j <br /> <br />MONITORING OF POTENTIAL LANDSLIDES <br />by <br />Louis DeGrave fAD <br /> <br />)11,Y <br /> <br />There are thousands of potential landslides in Colorado. However, only a <br />small percentage ot those potential slides would pose a real problem. The <br />geological survey has identified 12 such potential slides (page 124. Flood <br />Hazard Mitigation Plan for Colorado. January 1985). <br /> <br />It is proposed to monitor those 12 potential slide areas and any other ones <br />when identified. This monitoring could be done by installing white permanent <br />survey crosses. made out of heavy plastic or white aluminum. <br /> <br />A survey pin could be placed in the middle of these crosses. The pins could <br />be surveyed, initially and the survey crosses could be monitOl:'Il!iJ!:l,~.I1)Il;;lnS of <br />aerial photography on an annual basis. The State of Colorado has the airplane <br />and the photographic equipment to monitor those surveycrosses. <br /> <br />As little as two (2) feet of movement could be detected with aerial photo- <br />graphy. This type of monitoring probably provides the most economical means <br />of surveillance. <br />