TITLE:
Depreciation factor equation to evaluate the economic losses from ground failure due to subsidence related to groundwater withdrawal
AUTHORS:
Víctor Manuel Hernández-Madrigal, Jesús Arturo Muñiz-Jáuregui, Víctor Hugo Garduño-Monroy, Netzahualcoyotl Flores-Lázaro, Sócrates Figueroa-Miranda
KEYWORDS:
Aseismic Ground Failure; Groundwater Withdrawal Related Subsidence; Equation; Depreciation; Economic Losses
JOURNAL NAME:
Natural Science,
Vol.6 No.3,
February
26,
2014
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.