Apart from Česká Skalice, the reservoir also extends into the municipal territories of Velká Jesenice, Provodov-Šonov and Nahořany.

The reservoir is fed by the streams Rovenský and Rozkoš, and by a 2.337 km (1.452 mi) long canal from the Úpa River.

Permission for permanent operation was granted by the Ministry of Forestry and Water Management on 1 January 1976.

[2] Rozkoš serves the flood protection of the lower course of the Úpa and Metuje rivers and as retention basin, and is also used for summer recreation, water sports and for the breeding of fish.

A small hydroelectric power plant with installed capacity 675 kW is located on the main dam.