Proposta de classificação de risco para as barragens do Estado de Roraima

Abstract

The Law nº. 12.334/2010, amended by Law nº. 14.066/2020, establishes the National Dam Safety Policy and creates the National Information System on Dam Safety intended for the accumulation of water for any uses, for the final or temporary disposal of tailings and accumulation of industrial waste. The National Council of Water Resources - CNRH was given the power to establish general criteria for classifying dams by risk category through a classification according to aspects influenced by the probability of occurrence, accident or disaster, technical characteristics, construction methods, the state of conservation and the time of development and compliance with the Dam Safety Plan, in risk categories. This work aims to present a classification proposal regarding the risk criterion for dams in the state of Roraima, through a confrontation of the methods of Normative Instruction FEMARH nº 3/2017, of the National Council of Water Resources nº 143/2012, of methodology of the Water Resources Management Company (COGERH) and the method of the US Army Corps of Engineers - USACE. The EcoPark and 01 Gilberto Uemura dams were used as a case study. It was found that the change made by FEMARH, the height parameter compared to the CNRH method, did not have technical subsidies to prove its modification, and the COGERH and USACE methods had parameters, width and volume, which were not considered by the state managing agency and which would bring benefits in their classification. At the end, were proposed a risk classification model and a table with the classification of the dams studied in the State of Roraima for all methods in order to assist in the management of dam safety to the state inspection agency and updating the National Information System on Dam Safety database.