You aren't going to get that kind of funneling effect in Choctaw Bay. It's essentially a shallow rectangle- The north shore of the bay is 20-25 miles long, and the bay is about 5 miles wide. The kind of flooding that took out the I-10 bridge during Ivan and caused so much damage to downtown Mobile during Katrina happened in areas where the bays are essentially triangular- a wide area where they empty out into the Gulf, and an extremely narrow point on the north head of the bay.
Choctaw Bay as it is, you're talking about waterfront and low-lying properties getting some sort of normal storm surge. What happens in funneling is that you get a wall of water possibly 30 feet higher than official storm surge as the water from the base of the triangle gets pushed toward a single point, and it was the movement of such a huge amount of water toward such a small area that caused the Bay damage that it did.