Pots for decks

[Jfinlay]

I have a lovely new Timber deck and am wanting to find a rectangular lightweight pot/trough (approx 1.0mL x 400W) that has a water well, in which to plant a Crepuscule climbing rose to train along and over the railing. It will be in full sun. I am concerned that any overflow of water from the pot, with watering and/or rain will overtime damage the timber on the deck. Can you please advise anything I would need to do or add to the pot that would avoid this. What depth would you suggest the pot needs to be?

Would Bunnings have the type of pot I am looking for?  

I would appreciate any experience others have had with this and any ideas to fix the problem.

Thank you

[Jfinlay]

No problem. Thank you

Jennie