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FLOOD09597
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Last modified
1/26/2010 10:09:49 AM
Creation date
10/5/2006 4:29:04 AM
Metadata
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Template:
Floodplain Documents
County
Gunnison
Community
Marble Area
Basin
Gunnison
Title
Engineering Geologic Factors of the Marble Area
Date
6/1/1972
Prepared For
Gunnison County
Prepared By
Colorado Geological Survey
Floodplain - Doc Type
Educational/Technical/Reference Information
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<br />.~ . . -:, :-;(-. ,(,', ~, <br /> <br />- 12 - <br /> <br />Scarp Slope East of Beaver Lake (If) <br /> <br />Another potential problem area is the steep, barren scarp slope <br /> <br /> <br />(generally consisting of 40% to 60% slopes) to the northeast of <br /> <br /> <br />Beaver Lake and adjacent to the Crystal River. Development of such <br /> <br /> <br />an area even in competent rock such as granite would be difficult. <br /> <br />On'this slope of fractured and rapidly wasting shale, development <br /> <br />would appear to be very impractical. Although proper foundations <br /> <br />might be obtained by careful geology and engineering, the problems <br /> <br /> <br />of atcess and of erosion appear prohibitive. ..As .in other areas of <br /> <br /> <br />Mancos Shale, founding of homesites and other small structures may <br /> <br /> <br />be difficult if the shales encountered have the expected swelling <br />characteristics. <br /> <br />General Environmental Considerations of Mt. Daly Area <br /> <br />This area is part of the Carbonate Creek watershed which is well <br /> <br />known for the serious mud avalanches and flash floods which it produces. <br /> <br />Construction of roads, clearings for building.sites or ski runs, exca- <br /> <br />vation for utility lines, and similar construction activities are bound <br /> <br />to increase peak flood runoff .and sediment supply, both of which will <br /> <br />intensify the existing problems of flooding and destructive mudflows. <br />This will increase the hazard of flooding and erosion problems on the <br /> <br />.slopes of Mt. Daly as well as to existing homesites in the town of <br /> <br />Marble. Reconnaissance studies by the U.S. Forest Service indicate <br /> <br /> <br />that the revegetation potential of the shale-derived Mt. Daly soils is <br /> <br /> <br />very limited, so the problems associated with excessive runoff and <br /> <br /> <br />erosion and site grading would not be easily or quickly solved. <br /> <br />In general, we believe this area is best suited for low density <br /> <br />"""_:.: <br />
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