"There was no worldwide flood. Simply put: there is no evidence whatsoever for a worldwide flood. In other words, it’s impossible. It is time for Christians to admit that some of the stories in Israel’s primordial history are not historical. It is ok to concede that these stories were crafted in a pre-scientific period and were designed to offer ethical answers to questions of why and not questions of how." Link.1. Not all scientists agree that there is no evidence of a worldwide flood.
2. I think when people discuss think of the world as being seven continents in their current configuration. However, most geographers believe that there used to be one continent and because of plate tectonics it split into its current organization.
3. If at the time of Noah there was only one continent, then I think you could call it a local flood but then it would also be a world-wide flood. Even if you don't want to date the flood back that far you would have to agree that the continents would not be as far apart as they are today.
Debunking Christianity: There Was No Worldwide Flood, By Robert R. Cargill, Ph.D.