Abstract: An installation for spreading clayey mud on ground which is free from water and which is prepared to receive the mud by laying a filtering bottom above the level of ground water, said installation comprising a decanting tank in which a mixture of mud and flocculating agent settles, a mud extraction pump for extracting said settled mixture of mud and flocculating agent from the decanting tank and pushing it into a pipe to convey said mixture up to at least one high mud pouring point located above said prepared ground, said installation further comprising means for adding more flocculating agent to said mixture in the vicinity of said mud pouring point.