Watertight sediments are situated beneath very porous karstic deposits of carbonate rock in the extended part of Velika Paklenica, Brezimenjača, and in the springs of Mala Paklenica and the occasional flow of Orljača.  
      
Due to the combination of watertight and porous sediments, 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 and Pećica.
The most powerful spring is the Ivine vodice spring at the altitude of around 1200 m a.s.l., followed by Kontinovo vrilo at 870 m a.s.l., Crno vrilo at 780 m a.s.l., and Jukića vrilo at 600 m a.s.l. The Vratrovac spring is located above Ramići, and the spring of the occasional of Brezimenjača is located at around 1000 m a.s.l. The Suva draga spring is at the same altitude.

The Velika Paklenica stream normally sinks in the area beneath Anića luka. It flows in its entire length into the sea during the rainy season in spring, autumn, and winter.

The Mala Paklenica stream springs above Vlaškogradska draga at around 1 000 m a.s.l. Its capacity is 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 a.s.l..
The spring of Staro vrilo is located in the area of Velika Močila, as well as a few more seeping streams. The seeping springs occur also in Mala Močila during the humid parts of the year. In the highest zone of Velebit, a permanent water body can be found in Babino jezero beneath Babin vrh.