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• Scale Zoning applied to all of the existing slums in the city, including
the delimitation of risk areas, the identifi cation of active destructive
processes and evaluation of the susceptibility (or probability) of
accidents. The zoning should provide general information such as
the amount of housing subject to different levels of sensitivity and
spatial distribution, allowing characterization of the priority sectors
for intervention. It is a subsidy for the planning of action lines of the
municipal administration, involving the program of information and
a social mobilization program to build shelters, scaling human and
material resources to be allocated by the government, defi nition of
demand for slum upgrading programs, implementation of works of
stabilization, etc.;
• Scale Registration, applied to areas of high susceptibility to landslides,
involving the identifi cation and ranking of homes at risk and social
characteristics of families. The risk register should provide specifi c
information about the risk level of housing implemented in priority
areas of risk, the required conditions, socio-economic characteristics
of households and environmental aspects, providing a subsidy for
monitoring actions of civil defense, temporary removal of residents
during heavy rains, implementation of emergency stabilization works,
etc.
Zoning should be performed on the set of slums with a history of
accidents associated with geotechnical risks described above for areas of
slopes and/or downloaded (wetlands) and aims to characterize, map and
prioritize areas of risk. It includes the following activities:
• Characterization of risk sectors (physical delimitation and identifi cation
of active destructive processes) involving the following activities:
° Identifi cation, from the available data (geological, geotechnical letters,
aerial photographs, aerophotogrametric refunds and iso-inclination
maps), sectors of the study area which, in its physical confi guration,
present situations of potential risk;
° Research the geological and geotechnical surface (fi eld), to identify
constraints and observation of possible indicators of instability
associated with possible destructive processes;
° Identifi cation of the destructive processes operating in each sector
of potential risk, and
° Defi nition of the site risk over a base map, including the entire area
under the infl uence of the destructive processes identifi ed.
• Assessment of the likelihood of destructive events and setting the level
of risk (susceptibility) sector. In actual practice this activity in Brazil is
used as the method for qualitative risk analysis, in which the experience
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