"The river Ganges (Ganga) on her way to the ocean, was quafied down in a draught by the Muni when interrupted in his meditation by the rush of the water, and was let out by an incision on his thigh at the intercession by Bhagiratha, hence the Ganges is called Jahnavi or the daughter of Jahnu Rishi."
January 1, 1970
https://en.wikiquote.org/wiki/Ganges_in_Hinduism