I'm thinking of putting in some drainage for the guttering (and outside tap) at one end of our house - currently it all just spills out across part of the lawn / driveway, and it'd be nice to route it under the drive and into the woodland beyond.
Is there some kind of minimum recommended angle for such pipework so that it'll stand a reasonable chance of doing the job without quickly silting up? (I can't remember what I did for the guttering now, although 1" drop every 6' rings a bell)
I'll probably use 3" pipe if I can find* any (currently the only stuff I've seen is flexible 'corrugated' stuff which seems like it's just asking for trouble) and hopefully the slope is enough that I can have it come out into the woods above ground so I don't need any kind of fancy soakaway...
- I'm in the US these days, and nobody here really 'does' drainage of rainwater...
cheers
Jules