Crescimento urbano e seus impactos no sistema de drenagem de uma bacia em Natal/RN
The uncontrolled growth of most Brazilian cities is not accompanied by the development of urban infrastructure. With increasing soil sealing, runoff and decreased infiltration volume, impacts on water resources and on population of the areas affected by urban growth are inevitable. This study aim...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/21181 |
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| Resumo: | The uncontrolled growth of most Brazilian cities is not accompanied by
the development of urban infrastructure. With increasing soil sealing, runoff and
decreased infiltration volume, impacts on water resources and on population of
the areas affected by urban growth are inevitable. This study aims to evaluate
the use and occupation of a watershed and analyze the drainage system in
order to control the impact using tools to integrate urban development with the
drainage of rainwater in an important watershed in the Natal City, Rio Grande
do Norte State. The study involved the characterization of the basin XII.4 on the
land use and occupation, for the years 2005 and 2014. With the application of
SWMM model was possible to analyze the impacts caused by the urbanization
process in the existing drainage system, showing the two years analyzed have
their areas very close to percentage saturation of impervious areas. Although
the region is still predominantly single family residential, suffers increasing
verticalization of mainly commercial buildings. The drainage system is inefficient
for the area's needs by the year 2005. The drainage system was also tested for
four variations of land use by developing scenarios. Scenario 1 is related to the
year 2014, considered current. Scenario 2 was adopted the maximum rate of
80% for land use, allowed for the Natal City. Scenario 3 gives the critical
condition of land use, with the area 100% impervious. Scenario 4 is applied to
the existence of LID (Low Impact Device). The scenarios analysis showed that
all indicate deficiency at some point of the drainage system as a result of the
high degree of occupation of the area that generate higher flows than the initial
drainage system capacity. With the study it became clear that the adoption of
non-structural tools are effective in reducing flooding and improving the
drainage system capacity. |
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