Noah's flood and Giants What is the biblical bases for giants living through Noah's flood?

Before flood:

Genesis 6:4 KJV


  There were giants in the earth in those days; and also after that,
  when the sons of God came in unto the daughters of men, and they bare
  children to them, the same became mighty men which were of old, men of
  renown.


After flood:

1 Chronicles 20:8 KJV


  These were born unto the giant in Gath; and they fell by the hand of
  David, and by the hand of his servants.


Numbers 13:33 KJV


  And there we saw the giants, the sons of Anak, which come of the
  giants: and we were in our own sight as grasshoppers, and so we were
  in their sight.


Joshua 15:8 KJV 


  And the border went up by the valley of the son of Hinnom unto the
  south side of the Jebusite; the same is Jerusalem: and the border went
  up to the top of the mountain that lieth before the valley of Hinnom
  westward, which is at the end of the valley of the giants northward:
This is a good question.  I would assert that just because there were giants both before and after the flood does not necessitate that giants survived the flood.  In fact, the Bible indicates that there was a drastic reduction in lifespan after the flood.  It is possible that other things were different as well, including average height.  So, a giant before the flood would have been noticeably taller than the average height before the flood, and a giant after the flood would have been noticeably taller than the average height after the flood.  However,  what may have been considered a giant after the flood may have been average before the flood.

This is speculation, to be sure, but it should at least be considered a possibility, and there is at least some evidence that makes this feasible.  The largest human skeleton ever found is known as The Giant of Castelnau, who  was apparently 11'6".  Goliath is estimated to have been around 9'6".  So, Goliath would have been small compared to this guy and would have been relegated to playing point guard on the team.

Noah himself could have been very tall, having grown up in the pre-flood environment, which may have been a much healthier place to live.  He may have even been a giant himself, albeit from a race different than the Nephilim.

In any case, it is certainly feasible that there was a race of giants that merely arose after the flood and did not survive the flood.  The genetic makeup for large humans was present prior to the flood.  Perhaps Noah and his family contained these genes as well, but perhaps they were recessive.

So, there are a few possible explanations for this that do not necessitate giants surviving the flood.