And had turned their rivers into blood - Exodus 7:20. There was properly but one river in Egypt - the Nile. But there were several branches of that river at the mouth; and there were numerous artificial streams or canals cut from the river, to anyone of which the word river might be also given. Compare the notes at Isaiah 11:15.
And their floods ... - Their streams; the canals and branches of the Nile, where they usually obtained a supply of water.