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In order to characterize the variability of floods in the city of Santa Lucía, Uruguay, the objective of this study is to analyze at the basin level how factors such as climate variability and changes in land use and cover influence the occurrence of this phenomenon. Specifically, it evaluates the incidence of rainfall variability and productive intensification in relation to changes in riverbed level. Rainfall and channel level stations have been selected to evaluate climatic trends between 1990 and 2021 and the Land Use and Cover Changes (LUCC) have been determined by remote sensing. The results show, for Santa Lucía, a decreasing trend in the number and duration of flood events in autumn and partially in the number of flood events in summer and spring. They also reveal an increase in the duration of warning events in winter. Two patterns can be identified: a) floods conditioned by inflows from the Santa Lucía Chico river and b) floods conditioned by inflows from the headwaters of the Santa Lucía river. An important role is played by the association between the LUCC and the climatic behavior of the spatial distribution of precipitation, but also by the management of the Paso Severino dam. The concomitant events that influence floods show the need to broaden the study variables to include the analysis of flood management. [ABSTRACT FROM AUTHOR]

This work consists of a case study analysis of the upper basin of the Cuñapirú stream, located in the department of Rivera, in the area known as Puntas de Cuñapirú, identifying environmental problems and issues related to territorial transformations in the period 1990-2017. It aims to provide elements for understanding the processes of territorial transformations over a period of 27 years. he application of an environmental vulnerability model that integrates fragility and threat factors makes it possible to identify areas that are particularly sensitive to current andfuture impacts andfacilitates the identification of critical interactions in the environmental system, generating inputs for decision-makers. he application of the model was able to identify spatially the areas with the highest rate of urban expansion, which in turn constitutes the main threat and generates the highest levels of vulnerability. It was also possible to recognise which natural assets interact with these changes in land use (environmentalfragility). It is hoped that the results obtained will help to strengthen land-use planning and management capacities. [ABSTRACT FROM AUTHOR]

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In this paper, three case studies are analyzed in Uruguay at the basin level, to identify the factors that favor the flood phenomenon. Transformations in land use and eventually climate change are considered. Over a 30-year period, land use modifications were evaluated using a Geographic Information System, and the variability of rainfall and river levels was analyzed. The three basins show completely different behavior from their land use change, and show increasing trends in rainfall over the period analyzed. It is evident that land use change is one of the most influential factors in the increase of flooding in urban areas. These transformations are mostly related to the exploitation of soil for the generation of commodities for export and generate modifications in the agrarian territories in Uruguay. [ABSTRACT FROM AUTHOR]