ABSTRACT
Due to the significant costs and possible risks associated with the dewatering of pressure tunnels, inspections with Remote Operated Vehicles (ROVs) are an economical alternative that can provide valuable insights into their conditions. The headrace tunnel of Paute HPP Phase C is part of Ecuador’s largest hydroelectric complex and was inspected with an ROV in 2016 and 2021. A direct comparison was made between the two surveys, showing clear evidence of deterioration within a relatively short period, which complemented with the accurate quantification and location of the anomalies, allowed the planning of extraordinary maintenance works. This paper presents the main observations of the ROV surveys and describes the advantages of preventive monitoring through indirect inspections, which can provide extensive information on the conditions and evolution of pressure tunnels.
