outflow

(noun) the discharge of a fluid from some container. Synonyms: escape, leak, leakage. Examples: "They tried to stop the escape of gas from the damaged pipe." "He had to clean up the leak."

(noun) the process of flowing out. Synonyms: effluence, efflux.

(noun) a natural flow of ground water. Synonyms: spring, fountain, outpouring, natural spring.