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<br />0[' ~ 2"!.:~ <br />j,.il .t_".1 <br /> <br />i?J <br /> <br />t1jj <br /> <br />Trash or debris from human visitation is not noticeable. <br /> <br />10. Sedimentation Surveys <br />Twenty-two permanently established sedimentation canyon sections were <br />resurveyed in December 1974. No change from previous surveys has <br />oceurred. <br />11. Meteorological Station <br />A new meteorological station was anchored in. Bridge Creek Canyon and <br />aetivated in November 1974. Adjustments in the instrumentation were <br />still being made at this reporting. Data recorded by this station <br />relates to the factors of barometric pressure, humidity, wind direction <br />and speed and temperature of water and air. : These data will be used in <br />correlating funetions with other parameters of the monitoring program. <br />CONCLUSIONS <br /> <br />The Rainbow Bridge National Monument monitoring has covered an initial <br /> <br />cyele of maximum and minimum reservoir elevations. It is, however, still <br /> <br />premature to reach hard eonclusions because the maximum reservoir eyele <br /> <br />has not yet evolved~ <br /> <br />" <br /> <br />It is significant that diagnostie data collected to date reflects no <br /> <br />adverse physical reaction that can be related to the initial reservoir <br /> <br />incursion to maximum elevation 3667 feet under the bridge. These data <br /> <br />do, however, point strongly to the destructive potential of natural <br /> <br />phenomenon such as solar thermal gradients that cause the rock to expand <br /> <br />and contract under influence of seasonal cycles. Such activity occurs <br /> <br />independent of the reservoir. <br /> <br />7 <br /> <br />;t <br />I <br /> <br />'r <br /> <br />Ii <br /> <br />j{.'h~,_ ~ <br />~:~i <br /> <br /> <br />I <br /> <br /> <br />f;i'4,,, <br /> <br />~I.~ <br /> <br />C:tit~ <br /> <br />~A.-_,::i <br />~{~~~ <br />"fA,<-" <br />~~~":~ <br />!'l:~,.", <br />ii*'" <br />~,"'.,; <br />'.r~,!,,-";~ <br />~~ <br />~~~ <br />;~:'r~ <br />~~!;;~J1 <br /> <br />::;;'::"-:;.-. <br />~:~~~~;?~~~ <br />.:.-:;.:......-.:. <br /> <br />:.:,-'.;.';':;/ <br /> <br />.-...-....... <br /> <br />.~.-- :-. <br />-;-.'--..--.". <br /> <br />- : ;.::~~;.: .:;-:{ <br /> <br /> <br />)~;~iill~!ttft~~~~1r~~~i!~~~~~~.~1!~~~gi~1~~~i~~~fii%~4fJ;~i~;!~~frj'~~ffr~~~~~cbf~i~ll~~~til~~~ffl!~J;~J~~, <br />