waterlogged carpets

My passenger side footwell is swamped with water, I removed seat and lifted carpet and poured water arond windscreen area, the water seems to be coming from an orifice on front bulkhead by the transmission tunnel anyone know how it could be getting there.Drains are clear.
 
This might help http://www.z4-forum.com/forum/viewtopic.php?f=3&t=35925
 
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