Impactos da implantação de condomínios residenciais no escoamento superficial em uma sub-bacia do Rio Perucaba no município de Arapiraca / AL

Abstract

The rapid process of urbanization combined with inadequate planning are the main causes of changes in the natural scenario of a municipality. These changes occur mainly with regard to land use and occupation and, combined with the lack of an adequate drainage project, can cause changes in the natural hydrological cycle, which can lead to adversities such as floods. In the municipality of Arapiraca, a city where the urbanization process in the last decades occurred in a very intense way, it has presented several forms of enterprises that interfere in the degree of waterproofing of the soil. One of them is the investment in residential condominiums, which is linked to the subdivision of land for real estate construction. With this, the present work intends to evaluate the impact on the use and occupation of the land with regard to the generation of surface runoff where one of these projects is being built in a basin of the Perucaba River. For this, they were Three scenarios were chosen (2013, 2021 and a future projection) and those already elapsed were obtained from satellite images. From this, the classification of land use and land cover was made semi-automatically using the QGis software, so that hydrological simulations were later carried out using the SCS method, combined with the Unitary Hydrogram and the Convolution using different rainfall events, associated at different return times, for the three basin occupation scenarios. The results indicated that for the first scenario (2013), the soil of the region was fully permeable for the level of precipitation that occurs in the region, as for the 2021 scenario and future projection, the surface runoff has a very significant increase that need supervision of Organs competent bodies so that preventive measures are applied so that events with intense precipitation do not cause problems in the region.