Until Debeljača the Nadela (in this section also called Veliki kanal or big canal) flows as the real river, but after the Debeljača catchment for the purpose of irrigation, the river shrinks in terms of volume and discharge to the level of a brooklet, which combined with the use of water for industry in Jabuka and Pančevo down the stream and small inclination of the watershed (mouth at 68 meters ) means that without sluice gates pumps to push the water, the river would stop flowing.