the rovina's upper reservoir is at an elevation of and is formed by an embankment dam. it has an active capacity of and depth of . its catchment area is . the upper chiotas reservoir was formed with the construction of a tall arch-gravity dam which lies at an elevation of . the dam's thickness ranges from at the base to at its crest. its crest is long and the dam has a structural volume of . the chiotas reservoir is also supported by a tall and long saddle dam, called colle laura, directly to its east. the saddle dam is also equipped with a spillway that has a discharge capacity of . the storage capacity of the reservoir is while can be used for power generation. the catchment area for chiotas is and the reservoir reaches a maximum depth of .