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International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B7. Istanbul 2004
and February 2003, fact that justify an urgent revaluation of the
program of water supply for Florianópolis.
The study shows also that to possess private reservoirs of great
volume capacity is illusory in terms of plenitude of water
supply.
3.3 Water Supply Simulation
Due to the dimension of the study area and the complexity of
the supply system, the program of water supply simulation did
no consider possible pressure abatement caused by distance and
ground quota differences (NEVES, 1979) (GARCEZ, 1988).
House unities which possess small reservatories detect early the
lack of supply or no supply at all. Otherwise, when private
reservoirs are large, detection of water rationing or lack of
supply may not occur or may occur lately, when the reservoir
capacity is exhausted (figure 5).
When the thematic map is interpreted, the occurrence of few
days rationing is not to be considered optimistic, because they
only points to the fact that if lacking of water did not occur it
was only because of the large capacity of reservoirs. When the
Company pumps less or do not pump at all the results for the
beneficiaries differ in accordance to the capacity of their
reservoirs (Figure 6).
3.4 Proposed Model
Ideal conditions of functionality for urban management begin
with urban planning, although commonly urban planning comes
only after a long process of urban space occupation,
concentration and expansion had occurred. Under such
circumstances urban planning, that should be a preventive
process, will be destined to correct distortions.
The fundamental tool for urban planning is the implantation of
the urban technical cadastre, which enables the administrator to
the actual knowledge of facts. This way, the entire process will
be appreciated in accordance with the geographic information
system created from a cartographic base, with constant
actualizations, under legal patterns and cadastre surveying.
The model has a sequence of events, from the observance of
zoning premises to the Company in charge of sanitary
observance, which will study the local conditions for water
supply.
It is to be observed that this research concerns the conditions of
water supply, but this is only one of multiples elements that
must be taken in consideration in the ideal model.
Other decisions must be taken in relation with signs pointed by
beneficiaries insofar the quality of the water in the net and in
the reservatories is concerned.
Not less fundamental yet, is the integration of cadastral system
of the concessionary company with the cadastral system of the
municipal administration, both obligatorily bound to real legal
property premises.
4. CONCLUSIONS
In spite of pluviometric normality it is evident the vulnerability
of the water supply system to attend the requirements and its
precarious capacity is attested by the number of days of
rationing or lack of water that the beneficiaries have to endure.
The greatest menace to the inhabitants of Santo Antonio de
Lisboa is the lack of urban management and the deficient
interaction between municipal administration and CASAN.
Non-official nets of distribution are created, not as exclusivity
521
of areas with high ground quotas, without the necessary
observance of potability of water.
Although IPUF in partnership with CASAN have invested
significantly in aero-photogrametric — surveys of the
Florianopolis region inexists a geographic information system
based on a Multipurpose Technical Cadastre. As it was
hypothesized, the study confirms that inexists also relationship
between the process of urban occupation and the capacity to
attend the demand for potable water distribution.
The system lacks of dependable data that must be collected
through trustworthy scientific methods, which foresee,
inclusive, adequate calibration of instruments.
Only after the system were able to attend efficiently the present
demands it will be feasible future ability to manage gross water
from their sources, as well the adequate production of potable
water and its effective distribution.
As final conclusion it is not recommended any new occupation
of urban space in the area of study, on the face of the present
precarious capacity to attend fresh water demand.
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