BMW presented for investigation of water leak into the cabin of the vehicle.

Pictures show: 

Blockage causing water to block up the drain hole, allowing water to fill up the cavity and enter inside the car.

Old grommet seals verses new seals. 

Carpet removed inside of the passenger foot well. Removed the blower motor to gain access to plenum chamber for drain holes. We can see the drain access area was blocked. All sorted now and no water entering.

Video shows water leaking into cabin of vehicle whilst being water tested.