Water Ingress

[quattromark]

while driving this morning I could hear water sloshing around, more prominent when braking.

Pulled the NSF carpet up (as far as I could) and there has to be 15-20mm of water in the floor pan - because of the chunky foam backing, the carpet has'nt got wet yet.

Had a look in the scuttle panel - no standing water.

Had a look under the dash, there is no obvious evidence of water marks - and this has happened over the last 48 hours, I did not drive the car yesterday at all - the front has been parked under overhanging trees.

Are there any 'usual suspect' places where water gets in?

[Crasher]

It is usually the plenum chamber drains being blocked.

[quattromark]

So I syphoned around 6 litres of water from the floor pan today - didn't have time to remove the seats and pull the carpets back!

Had a look in the plenum chamber - think I've found the O/S drain, about 25mm in diameter - its under the brake fluid container? - it looks in bad shape, very cracked. Couldn't see another one like it - I'm just presuming there is one on each side?
However, just to the right of this drain is a hole around 40mm in diameter - looks like it should have some form of grommet in it, but it hasn't - should it have something in it??

I take it the drains are replaceable??