Throughout its course the Zalomka empties certain part of its waters into numerous estavelle, biggest of which is the last one near village of Biograd, which is also the lowest place of the field at 799 m a.s.l. With a swallow capacity of , this particular estavelle is one of the largest in the Dinaric Alps' karst. It is directly linked to the source of the Bunica, which is situated at 37 m a.s.l., so that the sharp difference in height is reflected in the rate of groundwater flow, whose notional (fictive) speed is up to , making it the fastest underground flow in the Dinaric karst. The ratio between the highest and lowest water level in the underground is 312 m, which is the largest amplitude in the world.