Re: 159 and a flooded road
Yeah, Alfa and water not a good combination!
The 156, as noted, has a very low air intake, behind the foglight on the left, it has about the same fording capability as a tortoise.
I once pushed my luck in my 156, but I had the older plastic undertray that went all the way under the engine, I think bow wave was all that saved me (see notes above on always checking depth!).
I assume the 159 has air intake in simialir place, its usually below the airbox, which is tucked in a wheel arch one side or other.
GT has air intake at bonnet level I noticed, but its shaped like a scoop, good for air, bad for water, although again I have been through about 40-50cm in a GT and survived - again bow wave is key! (I had spent 5 hours trying to get home at this stage, all other routes into the village were blocked, it was either that or sleep in the car!).
Also, you want to move through when no one is coming the other way as their bow wave will wash into your engine bay and vice versa. patience is key, also you want to drive down the center of the road, as when its covered in water you can't see the camber, and the centre is usually highest.
If you live in an area thats at risk, there is only one solution though, buy a land rover! (but don't forget to pull your Alfa mates out still)
Giulietta QV 1750TBi (been&gone= 156, GT, Abarth 500)
Mrs TallPaul - 159TI sportwagon 2.0JTDM