Plesevica/Una Aquifer - 110

Bosnia and Herzegovina - Croatia

Aquifer type 2

In Bosnia and Herzegovina: Surface water and groundwater divides separate from state border, recharge in one country, discharge in adjacent.

The Plesevica/Una Aquifer is made up of thick Mesozoic (dominantly Cretaceous), Neogene (dominantly Miocene) and Quaternary limestones and dolomites. Groundwater flows from Croatia (swallow holes in Krbavsko, Lapačko and Koreničko fields and the area of National Park Plitvice) to Bosnia and Herzegovina (towards the strong karstic springs in the Una River watershed, namely Klokot I and II, Privilica, ostrovica, Žegar etc); it has strong links with surface waters.


Plesevica/Una AquiferBosnia and Herzegovina
Area (sq. km) N/A 1564
Thickness: mean, max (m) 1000, > 1500 200, 500
Groundwater uses and functions >75% to support ecosystems and fishing, 25-50%
of abstraction is used for drinking water supply.
Predominantly drinking water supply; also supports
ecosystems; some 25% of total water use is groundwater.
Pressure factors Wastewater from septic pits is the main pressure
factor. PCBs from former military airport Željava
and relay station in Plješevica mountain might be
an issue of concern; more research is needed in this
regard. Solid waste disposal is also a pressure factor.
Polluted water is locally drawn into the aquifer. Local
but severe nitrogen, heavy metals and pathogens.
No problems related to groundwater quantity.
Groundwater management measures Many used but need improving, others
needed or currently planned.
Protection zones exist at Klokot, Privilica,
Toplica, Ostrovica and need to be established
in Korenički Izvor, Stipinovac and Mlinac.
Other information Transboundary impact for quality only. Sinkholes in Bosnia and Herzegovina with
transboundary effects in Croatia. Transboundary
aquifer under consideration, but not approved.
Border length 130 km. Delineation of transboundary groundwaters needs common research and bilateral decision
to propose a transboundary groundwater, if appropriate. Development of monitoring programmes is needed.