(Idéias julho/07) - Universidade Federal de Santa Catarina

ABSTRACT
The subject environmental risks, and, between them the social unequalities and
natural catastrophes, it has been a world-wide preoccupation. In Brazil several
inquiries are turned to urbane problems resulting from the occupation of spaces
without the proper consideration social environment. And, in the relation with the
economical system the structure and the environmental quality are characterized like
poverty of and in the urbane one. The municipality of Marechal Cândido Rondon,
situated in the West of the Parana, was colonized, effectively, from 1950, and since
the 1980s the urban population exceeds the rural and today it represents over 90 %
of the total. The city is located on the divisor of waters. In the study on the city of
Marechal Cândido Rondon they are to the questions made a list to the occupation of
areas unsuitable for the population concentrated, I eat them of voçorocas and in
slope, related to events of concentrated rains, which started to be occupied from that
time. Allied to these questions there has been also the great quantity of black pits
(approximately 14.000 unities) or sinks of domestic drain, which function is to absorb
and to purify the same thing and to contribute with the refuelling of the underground
sheets. The physical aspects and the forms of occupation of the ground turn in
vulnerable areas and of environmental risks. The areas of bigger risk of flooding and
of collapse reach the urbane residents of a general form, since they all have pits and
the allotments and occupations of areas of gullies do not depend on the purchaising
power. The concentrated rains and his dislocation cause flooding, lixiviations and
erosive processes, also in subsurface, producing sinking of built areas placing in
risks his occupants. The residents realize the risk of flooding, sinking and of collapse,
recognize the damages and factors that stipulate them, however, deny or coexist with
the risk. Getting the own house, the attachment to the place and the social relations
(families, neighbors and friends) they have a tendency to be more important. The
analysis and the knowledge of the dynamic one of the scenery, principally, of the
pluvial waters, when too many urbane characteristics were made a list to, should
precede new areas of allotment and the construction of sinks. However, it was noted
which actions in order that new environmental accidents were avoided are restricted
to individual measures, like the filling out or revetment of pits, to do more reinforced
walls, to stand up I halve it of the sidewalk, to sell the house. Meanwhile, allotments
at unsuitable places keep on being approved, for the public power, and, standards
and inspections for the construction of sinks are not carried out, in spite of predicted
in the master plans.
Words keys: risks, gullies, black pits, flooding