Have you checked this?

[dave2221]

I am sure there is already a thread on here for this.... but i figured a new topic was the best way to get most peoples attention.

Its raining here in Sydney, and i have had my 5 for 2 weeks.

I noticed today when i took off, there was a swishing sound coming from the passenger seat.

Basically, the water comes off your soft top, and drains into a plastic collecter which goes out through the floor. This is located behind the seat belt tower

Please check that this is clear, otherwise water will overflow into the cabin.

Also, check that the water is draining out of the sills, the holes on the passenger side for me were blocked, creating the water sloshing sound.

[de Bounce]

Yep, you are correct, it has been covered in great detail HERE

You could also do a search and add your information to the original thread which would bring it up for people to see!
It would also ensures the information is in one place instead of needing to find/read 2 or 3 different threads.

Regardless, thanks for contributing the photo's
Also don't forget the drain holes around the A pillar/header