Major Water Leak But Can't Find Source!

[VWKD]

Hi all,

Got home from playing footy tonight to find water pouring from under the car, a small stream in less than a minute... I looked down the road to see a trail so must have started at least a few hundred yards from home. Any way I climbed under and it's really difficult to see where the hell it's coming from exactly. It's not the rad or any obvious pipe that I can see and looks to be coming from behind the exhaust manifold ! but I cannot see where ! What is behind the manifold that could be leaking water?

Looking from under the car water is running down the starter motor so would suggest something above that, any ideas?

I can pour water into the X-Tank and it is coming out at a good rate ! at the moment I'm thinking I'll have to pull the manifold off to see where it's coming from ! can't believe such a big leak would be impossible to identify the source.

Thanks in advance for any pointers.