Integrated analysis of microdrainage efficiency and land use evolution in urban area

Abstract

In planning, management and urban sprawl managing, the evolution of land use and the efficiency of urban drainage systems must be considered to prevent flooding events, inundation and the erosion processes arising. Considering this, the objective of this work was to evaluate the spatial relationship between the efficiency and condition of micro-drainage and the spatiotemporal use and coverage of land, with the emergence and location of erosive processes in the area of the Botanical Gardens in Goiânia (GO), defining a practical and innovative methodology in the context of the literature for the in loco evaluation of the elements that constitute the microdrainage and classification and spatialization system according to their conservation and efficiency: Satisfactory, bad or terrible. The most microdrainage degraded locations were spatially related to the regions with the greatest waterproofing changes in the mapping of land use and coverage from 1964 to 2016, elaborated with aerial and satellite images. The results indicate that the erosive outbreaks origin is related to the first and quickest waterproofing changes that date from 1975, 1988 and 1992, totalizing 25% of the studying area. The eastern region of areas II and III showed fast waterproofing and higher density of points in the terrible condition of microdrainage, close to gullies and ravines. Therefore, in view of the analysis of the results, it is concluded that there is a spatial relationship between the variables of micro-drainage, land use and occupation, and erosive focus.