When Jehovah wished to punish a wayward world, he unleashed a flood upon it. So did many other gods. Enough or too much, water is a blessing and a curse. This idea is a persistent one across cultures. Water's flow also denotes the transmission of wisdom from a higher plane to ours.
Water is also a domain of the deepest emotions, passions, overwhelming feelings.
In Celtic legend, the Well of Wisdom is the spiritual source of everything, particularly the streams of the five senses. Celtic wells also were viewed as the entrances to the womb of the earth mother, from which all life flows. Water is a purifier, both of body and of soul. The ritual of baptism carries within it the sense of returning to the medium of birth, of being purified, and of being reborn. This is not a new idea.