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


3.2. Dam infrastructure in Rio Grande do Sul The state’s water infrastructure was designed for various purposes, such as flood control, water supply, irrigation and electricity generation, and is therefore made up of a series of dams, locks, dikes and pumping systems. This extensive and diverse hydrographic network is essential for managing the state’s water resources[13,14,15]


. According to data from the Dam Safety Report[5] , of the 26,157 dams registered in Brazil’s 27 federal units,


10,412 are located in Rio Grande do Sul, making it the Brazilian state with the highest number of dams in the country[9]


. Of these, 98% are identified as dams for water storage purposes and are under the direct


supervision of the state government. Considering the dams whose main purpose is to generate hydroelectric power, the state has 143


structures in operation, corresponding to 125 plants (Figure 4), which are monitored by ANEEL’s Dam Safety Monitoring System (FSBWeb)[16]


. Of this group, 34 dams are classified as Type B, characterized


by LOW risk and HIGH potential damage. 70 dams are classified as not covered by the Safety Law (12.334/2010).


Figure 4. Dams monitored by ANEEL in the state of Rio Grande do Sul, identified by Risk Classification (Type B - Yellow, Type - C - Green)[ANEEL, 2023]


A large proportion of these projects, around 87%, are small hydroelectric plants with little or no regularization capacity[15]


. Even the large capacity plants are mostly run-of-river plants. In terms of the


electricity generation matrix, the hydroelectric plants installed in Rio Grande do Sul account for 58.6% of the state’s installed capacity[13]


. This figure is proportional to the national installed capacity (53.15%)[15] In terms of Safety Level, based on the results obtained from Regular Safety Inspections (RSI),


requested by ANEEL and collected via the monitoring system, dams have their safety level measured on a scale that takes into account the combined effect of the anomalies observed in their structure or operation.


162 | Dam Engineering | Vol XXXIII Issue 3 .


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