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Depreciation factor equation to evaluate the economic losses from ground failure due to subsidence related to groundwater withdrawal

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DOI: 10.4236/ns.2014.63015    3,928 Downloads   5,279 Views   Citations

ABSTRACT

Subsidence due to groundwater withdrawal is a complex hydrogeological process affecting numerous cities settled on top of fluviolacustrine deposits. The discrete spatial variation in the thickness of these deposits, in combination with subsidence due to groundwater withdrawal, generates differential settlements and aseismic ground failure (AGF) characterized by a welldefined scarp. In cities, such AGF causes severe damages to urban infrastructure and considerable economic impact. With the goal of arriving to a general criterion for evaluating the economic losses derived from AGF, in the present work we propose the following equation: ELi = PVi*DFi. Where PVi is the value of a property “i”, and DFi is a depreciation factor caused by structural damages of a property “i” due to AGF. The DFi is calculated empirically through:

. This last equation is based on the spatial relations of coexistence and proximity of property polygons and the AGF axis. The coexistence is valued as the quotient of the affectation area divided by the total area of the involved property; and the proximity to the AGF axis is expressed as the inverse of the perpendicular distance from the centroid of the property polygon to the AGF axis. The sum of these terms is divided by two to determine the percentage that affects the property value (PVi). These equations are relevant because it is the first indicator designed for the discrete assessment of the economic impacts due to AGF, and can be applied to real estate infrastructure from either urban or rural areas.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Hernández-Madrigal, V. , Muñiz-Jáuregui, J. , Garduño-Monroy, V. , Flores-Lázaro, N. and Figueroa-Miranda, S. (2014) Depreciation factor equation to evaluate the economic losses from ground failure due to subsidence related to groundwater withdrawal. Natural Science, 6, 108-113. doi: 10.4236/ns.2014.63015.

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