The hydropower potential in the river between Sredna and Vacha had remained unexploited under the five dams development initiative, but is now utilized through the Tsankov Kamak project [REF].
In the narrow valley stretch of the Vacha River where the project is located, the geological formation consists of sound granites and gneissic formations except for a small patch of about 7m, which is the fractured zone of mylonites, which was filled up with concrete [REF].