If it was totally water logged it ay have been enough to wash it out depending on the soil type you have. If there is a heavy clay base under the top soil you may have problems getting rid of it.
The best way to reseed would be to rake away all the dead material, then while the soil is still loose from the raking put down the
seed, then using the back side of a
spring rake work the
seed into the loose soil. Once it starts to sprout make sure its stays well watered. Since youa er doing this in the
spring, you may wind up with a bumper crop of crab grass in the same spot come later in the summer, but there is nothing you can do to prevent that when seeding.
