The Spalov tunnel is a part of the HPP Spalov, but was implemented in a different separate project. The tunnel initial part (300 m out of 1600 m) was several times damaged during the years of its operation, especially during the freeze and thaw cycle and mechanical erosion.
Several options for rehabilitation were reviewed, considering cost, time and technical issues. As the best option, the tunnel has been covered with plastic geomembrane, reaching significant head and capacity efficiency and allowing very short installation.
Hydropol was responsible for the review of various rehabilitation options, followed by the technical design and contracting, site supervision, project management, and maintenance period monitoring.