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Figure 3.72. 1995 Johnson County Landslide<br />

Source: Kansas Geological Survey, http://www.kgs.ku.edu/Publications/AnnRep02/hazards/hazards.html<br />

• Landslides have a significant impact on transportation corridors, fuel and energy conduits,<br />

and communications linkages. Ground-failure events have devastating economic effects on<br />

Federal, State, local, and private roads, and bridges. Railroads, electric and<br />

telecommunication lines, dams, levees, and waste repositories can be affected by land<br />

movement. Road building and construction often exacerbate <strong>the</strong> landslide problem in hilly<br />

areas by altering <strong>the</strong> landscape, slopes, and drainages and by changing and channeling<br />

runoff, <strong>the</strong>reby increasing <strong>the</strong> potential for landslides. Landslides and o<strong>the</strong>rs forms of ground<br />

failure also have adverse environmental consequences, such as dramatically increased soil<br />

erosion, siltation of streams and reservoirs, blockage of stream drainages, and<br />

loss of valuable watershed, grazing, and timber lands.<br />

Development in Hazard Prone Areas<br />

Of <strong>the</strong> landslide-prone areas, Johnson and Leavenworth are also rated in <strong>the</strong> top 10 Kansas<br />

Counties for Housing Unit Gains Additionally, <strong>the</strong>se two counties are in <strong>the</strong> top 10 Kansas<br />

Counties for Population Gains If construction is occurring in or near landslide hazard areas,<br />

more structures/population will be at risk to damage/injury from landslides.<br />

The effects of landslides on people and structures can be lessened by total avoidance of<br />

landslide hazard areas or by restricting, prohibiting, or imposing conditions on hazard-zone<br />

activity. The hazard from landslides can be reduced by avoiding construction on steep slopes<br />

and existing landslides, or by stabilizing <strong>the</strong> slopes. Stability increases when ground water is<br />

prevented from rising in <strong>the</strong> landslide mass by (1) covering <strong>the</strong> landslide with an impermeable<br />

membrane, (2) directing surface water away from <strong>the</strong> landslide, (3) draining ground water away<br />

from <strong>the</strong> landslide, and (4) minimizing surface irrigation. Slope stability is also increased when a<br />

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