Hood scoops and the rain?

I was thinking about a 6 pack scoop for my 73 but I live in Seattle. What do you guys do about rain? Wont it get in the scoop and on or in the motor?
The hood on my 53 merc pick up has about 100 louvers in it and Im kinda worried about it once I get it on the road. I drive my cars every day rain or shine!