What is the most effective means of mitigating the risk of a slope failure for slope shown in the figure below? 
Definitions:
Groundwater
Water that exists beneath the Earth's surface in soil pore spaces and in the fractures of rock formations.
Sinking
The process where land or objects gradually go down or submerge in water or another medium.
Ground
The solid surface of the Earth, or a reference point in electrical engineering for a return path for electric current.
Earth's Water
The total amount of water found on, under, and above the surface of the Earth, including oceans, ice caps, groundwater, lakes, and atmospheric water vapor.
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