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<br /> <br />Mitigation <br /> <br />Many methods of mitigation can be designed for active or <br />potentially active landslide areas. These generally fall <br />Into four categories: 1) change of slope shape, 2) drainage <br />management, 3) retaining structures, and 4) special <br />treatments. Change of 510pe shape methods i nc I ude excavat i ng <br />the entire sl ide, benching, excavating the upper part of the <br />sl ide, increasing the weight and resistance to movement of <br />the lower part of the slide (loading), and a combination of <br />excavation and loading. <br /> <br />Drainage methods Include changes of surface drainage through <br />diversions and increasing subsurface drainage with various <br /> <br /> <br />A landsl ide on the edge of a subdivision west of Denver is <br />dest J ned to "shr I nk" backyards un I ess stab i I I zat I on measures <br />are taken. <br /> <br />construct I on pract ices. Reta in i n9 structures used to contro I <br />landslides include buttresses, pi les. walls. and anchors. <br />Spec I a I treatments for s 1 i de contra I i nc I ude freez I n9, <br />grouting. blasting and vegetative plantings or other surface <br />cover for water and erosion management. <br /> <br />Land Use <br /> <br />The above mitigation techniques can be quite costly. <br />particularly for large landslide areas. and are often used <br />only as a last resort or to protect expensive structures. <br />Even then they may be temporary and in the long run <br />Ineffective. In general. recognition and avoidance of <br />landsl ide areas with all structural land uses Is desirable. <br />Sign If i cant earth mov i ng or structura I use of the I and near I y <br />a I ways Just if i es a thorough ana I ys i s of the I andsl ide <br />potential prior to construction. In some situations. such as <br />highway construct.lon. landslide-prone areas are unavoidable <br />and mitigation measures must be uti Ilzed to fit the <br />circumstances. <br /> <br />27 <br />