Technological Advances

    Slovakia  2017.04.21

    In issue: Stamp(s): 1   

    Printing: photo engraving and metallography

    Issued in: sheets of 10 (2*5) stamps

  • Number by catalogue:  Michel: 815   Yvert: 714   Scott: 764  

    Perforation: Comb   Perforation type: 11 ¾x11 ¼

    Subject:

    95 cents.

    Orava Reservoir

    Additional:

    *Orava is a reservoir in northernmost Slovakia, forming the largest lake in Slovakia (35.2 km2). It was created by the construction of a dam between 1941 and 1953 on the former two sources of the Orava river. Several former villages had to be inundated for this purpose, including Hamri, Oszada, and Usztye. Probably the best known of them was Slanica, the birthplace of the Slovak intellectual and cleric Anton Bernolák (Antonius Bernolacius). Today, the reservoir is protected by the Horná Orava Protected Landscape Area.

    The average depth of the reservoir is 15 meters. In the northeastern extension of the reservoir is Vtáčí ostrov (Birds' Island), a government ornithological reservation. Species like herons, great cormorants, spoonbills and others inhabit the reservation, which is one of important bird areas of Europe. The wetlands around the reservoir are also regarded to be one of the most important in Europe. The protection of the forests skirting the Orava Reservoir has helped prevent erosion.

    The reservoir also includes a hydroelectric power plant with a pair of Kaplan turbines, put into operation in 1953. Their installed capacity is 21.75 MW and a flow rate of 2 × 50 m³/s. Annual electricity production averages 31 GWh.