Rain pooling on flat decking?

[Tennentslager]

Fitted 25m of decking for sister but she reckons rain is pooling on the top. It's level to within 2/3mm.

Options? Drill drain holes 

Lift it and *somehow* refit with a slope. It's 5.5*4.5m

Live with it!

[Steptoe]

Mate of mine that does it always puts a slight slope on it as he reckons you never get flat wood anyway and there will always be a twist or dip somewhere.

I only found that out when I was round his 'helping' him do his own, and I 'helpfully' pointed out to him that it wasn't level , 

I don't know how you could easily do that now though.

[Oz07]

40:1 gradient in line with grooves. Go back and jack it up one end or firing strips

[Mr Punter]

The boards will shrink across their width in a while, so the pooling will not be significant or long term.