Sérgio R. Leite, Ludimila L. Silva & Luiz R. Gomes


where:


A. Dams that present a high potential risk and damage category and whose anomalies require short-term intervention to maintain safety conditions, not always signifying an immediate risk of rupture;


B. Dams that present medium or low risk category and average potential damage and whose anomalies must be controlled, monitored and interventions can be implemented over the time to maintain safety conditions; and


C. Dams that present medium or low risk and potential damage and which do not present anomalies and existing ones do not compromise the safety of the dam.


In order to monitor the results of the obligations of the generation agents covered by the law, ANEEL


has developed a specific monitoring structure to collect information on the characteristics that define the classification of dams in terms of Risk Category and Associated Potential Damage. The processing of this information determines ancillary obligations that must be observed by generation agents, notably those associated with the preparation of the Dam Safety Plan (DSP), the Regular Safety Inspection (RSI) and the Emergency Action Plan (EAP), as well as the respective deadlines for their completion. In the context of the NDSP, ANEEL must ensure that the companies responsible for hydroelectric dams maintain an up-to-date safety plan and implement preventive actions to avoid structural failures. In addition, ANEEL must ensure that they draw up and apply the Emergency Action Plan (EAP) in the event of any imminent risk to the integrity of the dams or to the populations located in the areas of their direct influence.


In events such as those recorded in May 2024 in Rio Grande do Sul, ANEEL must act not only as an


inspector and regulator, but also as an entity that guides and coordinates the response in conjunction with other authorities, such as Civil Defense, the National Water and Sanitation Agency (ANA) and state and municipal governments.


3. Hydrology and Dam Infrastructure in Rio Grande do Sul


3.1. Regional hydrology According to Fritzsons et al[9]


, the climate is mainly influenced by relief, altitude, latitude and distance from


the sea. The state of Rio Grande do Sul (RS) is located in the southern region of Brazil between longitudes -49° and -58° and latitudes -27° and -34°, at 10m above sea level. In terms of relief, it is made up of plateaus, depressions, mountain ranges and the coastal plain. The state capital and Brazil’s fifth-largest metropolitan city, Porto Alegre, is situated on the Guaíba, which is formed by the confluence of nine river basins and leads to Lagoa dos Patos, the continent’s largest freshwater Lagoon, as show in Figure 3.


160 | Dam Engineering | Vol XXXIII Issue 3


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