The Biblical flood was global not local and though Ballard has some interesting ideas he’s not describing Noah’s flood.
A comet impact created a world-wide flood: http://www.threeimpacts-twoevents.com/wp-content/uploads/2012/12/COMET-IMPACT-ANALYSIS-AND-EFFECTS-21Dec12-WEBSITE1.pdf
Also, you can learn how simultaneuos impacts configured Earth’s landforms and instilled its obliquity here: http://www.threeimpacts-twoevents.com/wp-content/uploads/2012/10/SIMULTANEOUS-IMPACTS7.pdf