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<br />r1 <br />L_~ <br />r1 <br />J <br />summarized in Table H2, column 5. <br />H7.2.2 Probability Based Upon Observed Landslide Movements. <br />Probabilities where assigned to landslide outcomes based upon observed rates of movement in the slide <br />and landslide velocity classification. <br />Velocrry ojLandslide. The average velocity of the landslide through the head, body and toe was as follows: <br />• Spring of 1997 - 3 fUyeaz. <br />• Spring of 1998 - 1.42 feeUyeaz. <br />• Spring of 1999 - O.15 feedyear. <br />For consistency of analysis, mirrors 27 (head), 10 (body), and 13 (toe) were used as a basis for the <br />calculations. All periods were for 120-day periods from February and June of that year. <br />Landslide Velocity Class (LVC) and Landslide Outcomes. Based upon Vames, the landslide may be <br />classified according to its velocity (Landslide Velocity Classification, LVC). A relationship between the <br />landslide velocity and landslide classification is shown on Figure HS-12 of Appendix H5, based upon <br />Appendix A of the ] 997/98 report. The landslide movement and corresponding LVC aze summarized <br />below: <br />(1) Rapid movement, LVC greater than 3.5. <br />(2) Slow movement, LVC between 3.5 and 2.5. <br />(3) Very slow movement, LVC between 2.5 and 1.5. <br />(4) extremely slow movement, LVC less than 1.5. <br />Using the landslide velocities computed for [he springs of 1997, 1998, and 1999, LVC's can be assigned <br />Barr Engineering Company <br />PCDOCS1208220/CAK <br />July J1, 1999 <br />26 Appendix H <br />1999 Atltlentlum to <br />7997/98 Lantlslide Corrective Measures Report <br />