Population -10 635 (45 inhabitants/ km'). Recharge area is both in Croatia and Slovenia, the discharge area is in Slovenia. Possible drainage to surface water systems, groundwater covers the total of the water used in the Slovenian part, groundwater flow direction from Croatia to Slovenia. Spring water quantity fluctuates significantly due to the karstic geomorphology, water scarcity in summer, possible problem regarding the surface stream hydrological minimum during drought.