Patrick Spears, a sometime poster on this board, has put together a great website that rebuts specific creationist claims for the Flud. You can find it
here. Another page of good anti-Flud links is from
Glen Morton's flood page. And of course, we have the ever-popular
talkorigins on the Flud, as well as Karen Bartlet's essay on specific ICR claims
here. Those links should provide you with plenty of ammunition.