Watertight sediments are situated beneath very porous karstic deposits of carbonate rock in the extended part of Velika paklenica, Brezimenjača, and in the spring parts of Mala paklenica and the occasional flow of Orljača.
This is why Paklenica National Park has several permanent or occasional flows and many permanent springs. The permanent springs of high-quality drinking water are Stražbenica, Kontinovo vrilo, Crno vrilo, Velika Močila and Pećica.
The most powerful Velika Paklenica spring is the Ivine vodice well at an altitude of around 1200 m, followed by Kontinovo vrilo at 870 m, Crno vrilo at 780 m, and Jukića vrilo at 600 m. Above Ramić is the Vratrovac spring, and the spring of the occasional flow of Brezimenjača is at around 1000 m. The Suha draga spring is at the same altitude.
The spring of Velika Paklenica normally sinks in the area beneath Anića luka. It flows in its entire length to the estuary into the sea during the rain season in spring, autumn and winter.
Stream Velika Paklenica
The flow of Mala Paklenica springs above Vlaškogradska draga at around 1 000 m, its capacity lesser, depending on the season and precipitation. The flow gradually descends to the parallel flow of Orljača, and the stream is active in the canyon during rainy autumns, winters and early springs, when the torrent flow of Orljača, springing beneath the slopes of Sveto brdo, flows into it at 484 m.
The fenced spring of Staro vrilo is in the area of Velika Močila, as well as a few more seeping streams. They are also present in Mala Močila during the humid parts of the year. In the highest zone of Velebit, permanent water deposits can be found in the lakes beneath Malovan and in Babino jezero beneath Babin vrh.