The book of Genesis contains a detailed account of a great flood, apparently covering the entire earth. It is reasonable to ask how God caused this flood and what the geological data are to support the Genesis record. God, of course, could have created enough additional water to have covered the earth with a flood, and then annihilated the water afterwards. However, the assumption is made that God stayed within the bounds of the natural laws he had established at creation. This paper is an examination of what the Bible author related about the flood.