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• sfcl SLOPE FAILURE COMPLEX: an area consisting of various <br />sfc~ types of slope failures and mass-wasting features such <br />sfc, as landslides, mudflows, rockfalls, and soil creep. <br />These areas are especially unstable and the <br />advisability of their development should be determined <br />only after detailed geotechnical studies. The relative <br />age of this unit is indicated by subscripts (1 is the <br />youngest). <br />us UNSTABLE SLOPE: a slope where mass movement <br />may have occurred and where recent movement <br />is not apparent or is uncertain. The slope <br />generally is characterized by landslide or <br />soil-creep physiography and may be <br />susceptible to landslide, earthflow, mudflow, <br />or accelerated-creep processes, especially if <br />disturbed. <br />pus POTENTIALLY UNSTABLE SLOPE: a slope which <br />currently is in equilibrium and where past or <br />present mass movement of the soil or rock is <br />not apparent. Physical attributes, such as <br />composition of surficial and bedrock <br />materials or slope inclination aspect, are <br />similar to nearby areas that have failed. <br />These slopes are favorable for mass-movement <br />• failures, especially if such slopes are <br />disturbed. <br />pfp PHYSIOGRAPHIC FLOOD PLAIN: a flat, relatively <br />smooth area adjacent to and formed by a river <br />in its present regimen. The flood plain may <br />be covered by water during flood stages and <br />is susceptible to the adverse affects of <br />erosion and sedimentation; e.g., <br />undercutting, slumping, scour, and infilling. <br />Any construction within the flood plain will <br />change the areas subject to flooding and this <br />should be very carefully evaluated to <br />determine if flood waters will adversely <br />affect the proposed land use or adjacent <br />areas. <br />sf SHEET FLOW FLOODING AND EROSION: an area <br />subject to the overland flow of rain water <br />runoff that spreads as a relatively thin, <br />continuous, uniform sheet of water over a <br />relatively large, nearly planar area. Sheet <br />flows cause erosion and deposition of fine- <br />grained materials and commonly occur on <br />terraces, alluvial fans, and in valley-fill <br />areas. <br />rcxxxx ~e~xc~r:ox EXH-12 - 3 - <br />