It flows unregulated for roughly 6.3 kilometers through Livanjsko Polje before it reaches section from where the rest of its course it flows regulated through artificially created riverbed, which is simply excavated in soil. From that point river also changes its name, appropriately, to the Prokop, which in English literally translate as a trench, a ditch or dug out canal. Some 1.2 kilometers upstream from there the Bistrica receives the Žabljak river waters from the left. Further down the stream it receives the Sturba river, also from the left. After 14.9 kilometers the Bistrica than receives significant amount of waters from northwestern half of Livanjsko Polje, which is channeled through artificial canal named after existing river, the Plovuča, which still exists in that part of the polje (English: field).