Unica (river)

Unica

Unica at the Planina confluence
Country Slovenia
Basin
Main source underground confluence of the Pivka and the Rak in the Planina mountain cave
500 m (1,600 ft)
45°49′11.17″N 14°14′46.51″E / 45.8197694°N 14.2462528°E / 45.8197694; 14.2462528 (Primary source of Unica)
River mouth Vrhnika
308 m (1,010 ft) (underground)[1]
Physical characteristics
Length 20 km (12 mi)
Discharge
  • Average rate:
    13 m3/s (460 cu ft/s) (at the source in Planina Cave), 24 m3/s (850 cu ft/s) (at the outflow in Vrhnika)

Unica is a river in Slovenia. It starts as the underground confluence[2] of the Pivka and the Rak in the Planina mountain cave. It forms the greatest confluence of underground rivers in Europe. 300 meter further Unica reaches overground near Planina. It then is about 10 km long. It has a northward direction of flow through Planina Polje (Planinsko Polje) over the municipalities of Postojna, Cerknica (Ivanje Selo) and Logatec (Jakovica), where it returns underground.[3] It then flows for about another 10 km underground, emerging 142 m lower[1] in multiple sources near Vrhnika to form the Ljubljanica river.

References

  1. 1 2 http://www.burger.si/Cerknica/PlaninskoPolje/uvod_eng.htm Planinsko polje
  2. ↑ http://www.dedi.si/dediscina/89-planinska-jama dedi.si
  3. ↑ http://www.geopedia.si/Geopedia_en.html#T1193_F5567:10114012_x442141.871_y81796.85149999999_s14_b4 Geopedia.si
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