Greenhouse drainage

Redcross

My greenhouse floods with heavy rain. I have been told that I need to remove the two rows of bricks that are positioned against the greenhouse base , dig a trench and fill with gravel.
I'm looking for guidance on how deep the trench should be and should I use 10 mm or 20 mm gravel.
Any advice would be gratefully received.
Thank you

twopenny

Red cross I can't answer your question, I'm still hoping for a greenhouse one day.
But it sounds a reasonable idea and quite simple.

Can you post a photo of the greenhouse in it's setting we could have a stab at it.
We have one person at least who should know. Probably more will drop in.

Or you could ask for your post to be moved to the DIY form where I know they know about gravel and drainage 

Redcross

Thank you, I'll do that