Pivka Creek Is In Periodical Flood, Internal Karst-Kras-Carso
28-december-2017: first incessant rain and then heavy snowfall (which last, indeed, partially block, by freezing them, the highest resurgences...) and the part of marls and sandstone (flysch) ground of the Postojna and Pivka basins (polje), that are (with Cerknisko and Planinsko polje-Loška Dolina and down to Logatec and Vrhnika Valley) the valley floor of the "Inner" Karst, began to flood in the areas subject to these events periodically, both because of the underground springs both due to the overflow of the Pivka creek which is what created the vast underworld of the famous Postojna Caves and many other cavities, not all known but surely all interconnected to each other.
These waters flow into the far Black Sea and not to the nearby Adriatic Sea, for this reason we talk about the INTERNAL part of the Karst Region, then beyond the watershed Adriatic/Black Sea.
The Coastal Karst Region, on the contrary, is defined as such where surface and underground waters flow into the Adriatic Sea.
In particular, these are the coastal Karst creek-streams called (slovenian/Italian names): Vipava/Vipacco, Reka/Timavo (30km underground, from "Park Škočijanske Jame" to "San Giovanni al Timavo"), Rižana/Risana and Dragonija/Dragogna.
Pivka Creek Is In Periodical Flood, Internal Karst-Kras-Carso
28-december-2017: first incessant rain and then heavy snowfall (which last, indeed, partially block, by freezing them, the highest resurgences...) and the part of marls and sandstone (flysch) ground of the Postojna and Pivka basins (polje), that are (with Cerknisko and Planinsko polje-Loška Dolina and down to Logatec and Vrhnika Valley) the valley floor of the "Inner" Karst, began to flood in the areas subject to these events periodically, both because of the underground springs both due to the overflow of the Pivka creek which is what created the vast underworld of the famous Postojna Caves and many other cavities, not all known but surely all interconnected to each other.
These waters flow into the far Black Sea and not to the nearby Adriatic Sea, for this reason we talk about the INTERNAL part of the Karst Region, then beyond the watershed Adriatic/Black Sea.
The Coastal Karst Region, on the contrary, is defined as such where surface and underground waters flow into the Adriatic Sea.
In particular, these are the coastal Karst creek-streams called (slovenian/Italian names): Vipava/Vipacco, Reka/Timavo (30km underground, from "Park Škočijanske Jame" to "San Giovanni al Timavo"), Rižana/Risana and Dragonija/Dragogna.