steep slopes can be covered or sprayed with wire mesh to prevent rock falls
retaining walls could be built to stabilise a slope
if the slope is made of highly fractured rock, rock bolts may be emplaced to hold the slope together and prevent failure
drainign pipes could be inserted into the slope to more easily allow water to get out and avoid increase in fluid pressure, the possibility of liquefaction of increased weight due to the addition of water
oversteepend slopes can be graded to reduce the slope to a natural angle
in mountain valleys subject mudflows plans could be made to rapidly lower levels in human maden resevoirs to catch and trap the mudflows.
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