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- Table 1. Relationship between potential landslide impacts. social nd economic elements impacted. and their significance. POTENTIAL LANDSLIDE IMPACTS !-< ~ - Z r.l ~ o (.,) z - DEBRIS CLEAN UP Local or small debris flows, landslides, and rockfalls that spill onto roads and streets are relatively easy to clean up and are therefore mostly a costly nuisance. However, repeated road clean up over the years plus the undocumented expense of clean up and landscaping repair costs to homeowners can result in a sigrtificant long-term expenditure of funds. ROADIRAILROADIBRlDGE DAMAGED (BUT PASSABLE) H transportation corridors are damaged but passable, they ;.w not prevent the flow of traffic. They may, however, result in delays and restrict some sizes/weights of vehicles. They may also be dangerous in view of the potential for sudden collapse WSS OF CROPS OR FOREST RESOURCES Agricultural crops can be destroyed by 1) surface dislocation, 2) burial, and 3) water loss due to disruption of irrigation ditcl water supply. Tunber crops can be lost through 1) surface disruption, 2) removal or burial by debris flows. IRRIGATION DITCH DAMAGE Damaged irrigation ditches result in 1) loss of revenue because crops cannot be irrigated, 2) loss of service to property owners receiving water from ditch, 3) costs to repaiJ ditch, and 4) if flow is not cut off, water will saturate slope even further, increasing landslide damage and extending it to nearby roads and/or property. INCREASED SEDIMENTATION Landslides and debris flows into streams or rivers add vast quantities of sediment to the water system. This can 1) silt u reservoirs, resulting in loss of storage capacity, 2) cause damage to pumps for water intake, 3) diminish water quality for drinking, 4) kill fish and fish eggs, and destroy fishing areas (resulting in loss of revenue), 5) cause degradation in crop land when silt decreases permeability, and 6) add enoug bulk to the stream flow to cause catastrophic flooding. ROADIRAILROADIBRlDGE BLOCKAGE (TOTAL) Total blockage will prevent traffic flow and affect 1) workers' ability to commute, 2) access of emergency vehicles, and 3) the normal flow of commerce. Blockage time may range from short interruptions to long-term or permanent stoppage. In addition, pieces of a bridge may eventually cause channel blockage and result in backwater flooding. COMMUNICATIONS OUT (INABILITY TO CALL FOR AID . IN CASE OF EMERGENCY) w ~ r.l (.,) ~ - "" - Z " - en " Z - ~ ~ (.,) Z - ~ 18 <~ ~ MAJOR SOCIAL AND ECONOMIC ELEMENTS IMPACTED ~o ~ +~ ~~ "P~~d' ~'% . . . . . . . . . . . . . . . . .