"Water is for Washing" is a science fiction short story by American writer Robert A. Heinlein, first published in Argosy (November 1947). It is based on the premise that an earthquake had catastrophically shattered the range of alluvial deposits separating the Imperial Valley from the Gulf of California, precipitating a tsunami moving north to transiently drown these lowlands. In his notes, Heinlein said that he had a dream in 1946 in which he conceived of the entire story. Source: Wikipedia (en)