Two cars in about 5 years for my department. No flood conditions, just blocker sewers. The command staff even gave training in an officer's meeting about it. Topped it off with a picture of one of our squads with water line decals on the squad. It was a good laugh but no one will be laughing if that happens again.
And we got a new policy on driving into water of unknown depth. Basically it says if you do not know the water depth you better not be driving in it or you will be screwed if anything bad happens.
I still laugh when one of the older guys tells the story about how the "rookie" drove the squad into a "lake" and then would not get out of the car. Older officer had to go hook up the chains to pull him out since the rookie would not get out and the tow guy was not about to go into the water.
Couple years later, same thing except a different officer got out of the car and the water flooded the interior of the car.