drop of the river. In its original form, it contained two Francis turbines with an installed power of 87 kW each and was used to power the city's electrical lighting. Today, it contains one generator with a power of 160 kW and a yearly electricity production of 400 MWh. It has a hydraulic head of 2.6 m and an intake capacity of 9 m3/s. The water is directed into the intake by a low, 70 m long concrete dam, colloquially called "beton" (bos. concrete), that doubles as a walkway and bathing site during low water levels. During high water levels, excess water flows over the dam forming a long waterfall. The power plant along with all other related structures was in 2011. declared to be a national monument of Bosnia and Herzegovina. The Krušnica hydroelectric powerplant is located near the source of the Krušnica river near Bosanska Krupa and was, like the Bihać power plant, build during the Austro-Hungarian rule in Bosnia, in 1911. It has an installed capacity of 460 kW and a yearly electricity production of 400 MWh. The Una Kostela hydroelectric power plant is located 9 km downstream of Bihać, near the village of Kostela. It is a run-of-the river plant that diverts a large part of the flow to be used for power generation and leaves behind a minimum amount of water to flow over the old waterfalls. Construction of the powerplant was finished in 1952. during the Yugoslav period. The powerplant contains four Kaplan turbines that use 16 m3/s of water each for a total of 64 m3/s. It has a hydraulic head of 12 m as the powerplant was constructed at the site of a large cascade of waterfalls. The installed capacity of each turbine is 2.35 MW for a grand total of 9.40 MW. Even though there are two hydroelectric powerplants constructed on the main course of the river, the river flow can still be classified as uninterrupted because the powerplants do not divert all the water to be used for power generation. Tourism The entire watershed of the river has a very large potential for the development of tourism. Notable areas include the upper section of the river, with the Una National Park and its waterfalls, the cities of Bihać and Bosanska Krupa and the surrounding countryside. The tourism sector experiences steady growth, and the number of visitors to the national park