Here are some of your unresolved problems with a global flood:
1. THERE IS NOT ENOUGH WATER.
2. The ark could not float.
3. The animals could not have traveled to him from all over the world. (Think: sloths, polar bears, wombats, penguins.)
4. The animals could not possibly have fit.
a. Either there were millions of animals, who could not have fit.
b. Or there were fewer animals, and since then hyper-evolution has been creating new species every year.
5. It's impossible to bring provisions for all those animals for a year's travel. Bamboo for pandas? Eucalyptus for koalas? Fish for seals? Not even going into the huge problems with carnivores. What did they bring for the lions to eat?
6. Other care: exercise, waste disposal, etc.
7. Geological evidence. There's so much of it it would take years to cover, but the geological evidence of gradual evolution over millions of years, sedimentary layers that take millions of years to accumulate, flood channels now buried under ground, land traces, such as raindrops, then buried under sediment, occasional sedimentary flood layers, etc., etc. is overwhelming. That is why there's not a geologist on earth who accepts the flood. You simply cannot look at the actual evidence and reject it without being insane.
8. In particular, varves. Also ice cores, stalactites and coral reefs.
9. The fossil record is not consistent with a single disastrous flood, quite the contrary. Flying petradons appear lower in the record than moles. A flood cannot account for this.
10. More geology: layered fossil forests, one one top of another.
11. The plants could not have survived.
12. The fish and other aquatic species could not have survived.
13. Disease causing bacteria could not have survived.
14. The animals could not have gotten to their present geographic distribution. How did the pandas get to china, the sloth to South America, the wombat to Australia, and the Grizzly Bear to Alaska?
15. There is not record of such a flood in Egypt and Mesopotamia. These cultures kept records which are confirmed by other dating techniques.
16. There is not enough time for human population to have grown from under 100 to many billions.
Thanks to Mark Isaak. We look forward to your solutions to these problems.