wet passenger carpet

[duncan11]

Hi I keep the Boxster outside with a good half cover over the roof. Just noticed today that the passenger side carpet is wet, not flooded though,as I realise the ECU is under seat . Their is 4 rubber grommet type thingys with slots in bottom by battery.when I put water down the 2 outboard ones it comes out above front wheels. When I put water down the 2 inboard ones by battery it does not appear to drain anywhere, perhaps it fall's onto under tray of car. The front grommets have a slot in the base of them , I presume to let the water through. Apparantly, Porsche did away with drain tubes at some time, and just had the Grommets through the body work, The rear of the mat does not seem wet , just the front. Any ideas greatly appreciated. Thanks