Identificação das áreas susceptíveis a alagamentos na área urbana de Frederico Westphalen - RS

Abstract

Soil waterproofing and extreme precipitation events alert the public and private sector to the direct change in runoff and the need to adapt, expand and make urban infrastructure (especially basic sanitation) more efficient to allow cities to offer quality of life for its populations. This work aimed to define the areas susceptible to flooding in the city of Frederico Westphalen (RS), through analysis and mapping, using the tools provided in the Hydrology module of the ArcGIS software (ESRI, 2020). Data from level curves, mapping of city blocks, the outline of the urban area and slope information from the terrain were used, data inserted and treated by the ArcGIS 10.3 software. With these, the Fill and Fill Sinks tools were applied to correct the filling of DEM cells, the Flow Direction to obtain the flow direction and then the Flow Accumulation. Through these tools, flooding points were identified in Arthur Milani and Cabo Rocha Streets. Through the software it was possible to assess a slope map of the city and confirm up to 25° of slope in some streets. The Hydrology module of ArcGIS is actually efficient, since indicate exactly the same flooding points as there was reported by the regional media and the population itself. The approach showed that areas affected by the floods are also influenced by the higher declivity, but they also suffer from anthropogenic impact of the land use.