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<br /> <br />'I'l <br /> <br /> <br />FIGURE 10. - Overbank sediments deposited along 1Iclntyre Gulch at Holland Street in Lakewood, when culvert <br />under street, behind observer, was unable to accommodate flood crest. Similar blockages caused flooding and <br />sedimentation in many other places in Greater Denver area. <br /> <br /> <br />FIGURE 11. - Form and nomenclature of a landslide <br />(Varn S, 1958, pI. 1). <br /> <br />movement of many old landslides, and caused <br />new landslides where none had existed previ- <br />ously, <br />The landslides that ensued included slumps, <br />earthflows, mudflows, debris slides and debris <br /> <br />flows, and rockfalls (in the nomenclature of <br />Varnes, 1968, pI. 1). Transitional forms were <br />abundant, and the distinction between types <br />was often arbitrary - the difference between a <br />simple flood of muddy water and a true mud- <br />flow, for example, is largely a matter of the <br />proportion of water to sediment. In most classi- <br />fications, the so-called "mudslides" reported by <br />the news media are highly fluid mudflows or <br />debris flows. The term 'jflow" is more appropri- <br />ate than the term "slide" because the mode of <br />movement is essentially flowage rather than <br />sliding. Similarly, mudflows grade into earth- <br />flows, and earthflows grade into slumps, <br />Landslides occurred when the frictional <br />forces that tend to hold a slope in place were <br />exceeded by the gravitational forces that tend <br />to cause it to move or fail. These forces can be <br />expressed as a safety factor, s, which, in the <br />simplest terms, is the total shear resistance, r, of <br /> <br />12 <br />