What is the most likely cause of a sudden flood?

Around them the bridge began to hum with a sudden flood of energy.

After a day of heavy rain there was a sudden flood through the ford.

All about them now, as if there had been a sudden flood.

Fleeing the sudden flood 7,500 years ago, these people must have taken their skills somewhere else.

Finally the moon came, a sudden flood through the transparency of the evening air.

The sudden flood of radio noise wasn't intended for them.

She knew where this sudden flood of strange emotions was coming from.

A sudden flood of light brought him snapping back into the present.

Now, we can experience the sudden flood of color along with him.