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<br />e <br /> <br />e <br /> <br />Sumlllllry . <br /> <br />S lrearns located in Colorado where harsh and sustained winters occur may be frozen <br />over a sustained portion of time. The breakage of winter ice, floating ice moving with <br />the channel, the gouging action of ice jams, and the lifting and crushing action of ice <br />rising and fal1ing with changes with water level can be significant causes of erosion and <br />damage to bank protection works. Erosion often occurs when floating debris impact <br />against the bank. The most common type of debris encountered on rivers is floating or <br />submerged wood. This malerial is nonnally inlroduced into the slrearn during rising <br />river stage (May 1982). <br /> <br />3.6 Summary. <br /> <br />Assessing the mechanics of slrearn bank failure can be quite difficult. This is due to the <br />shared end result of the failure with the surrounding environment. Aid of a geotechnical <br />engineer may be required to detennine the causes of bank failure. <br /> <br />Erosion, is by far the single most important item to identify. If the cause is successfully <br />detennined, a solid foundation for the entire erosion control project can be built. This in <br />turn will yield the intended results. <br /> <br />Colorado Erosion Control Manual <br /> <br />23 <br />