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<br />00, ~'i13 <br /> <br />at;> <br />-.j'I <br />e- <br />N <br />~ <br />,~ <br /> <br />6.5 QQn21[~~liQn_Qf_e[~:21ig~_Q~11~1_WQrk2 <br /> <br />Control of flooding by reservoir may be possible by providing a <br />drainage outlet below the slide at the level of the river or the highway <br />before movement of the slide occurs. The outlet works would obviously <br />have to be constructed in stable ground on the bank opposite the slide. <br />Several ideas have been suggested concerning the form of the outlet <br />works. The options under consideration by the task force are listed <br />below: <br /> <br />* lay a substantial gravel seam at the toe of the slide as soon <br />as significant movement occurs <br />* construct a 10 to 12 foot diameter reinforced concrete <br />pipeline <br />* construct a reinforced concrete box culvert <br />* excavate a tunnel <br /> <br />6.6 AggiliQn~1_21~gi~2 <br /> <br />Further hydrologic investigations may be appropriate if additional <br />work by the Colorado Geological Survey indicates movement of the slide <br />areas could be significant. Refinement of this analysis would include <br />looking at the runoff volume of flow during an average runoff season and <br />during 1984 for comparison. <br /> <br />The reservoir capacity curves should be checked using more detailed <br />maps, if available, and a planimeter. <br />