After the Second World War, which he spent working in a sawmill in Velké Karlovice in eastern Moravia, a number of members of his family were expelled from Czechoslovakia as Germans. Karel Valoch became a member of a group of young amateur scientists interested in the Palaeolithic which was in contact with Karel Absolon, a retired professor and renowned Moravian scientist. The majority of the members of this group ( e.g. the anthropologist Jan Jelínek, the palaeontologist Rudolf Musil and the archaeologist Bohuslav Klíma) later became world renowned scientists and cooperated with Karel Valoch on his research on the Central European Pleistocene. Valoch began to work in the Diluvial Department of the Moravian Museum (later the Anthropos Institute) in 1952, where he remained until the end of his days.