Is 76mm gutter OK for my shed?

[pedr0]

I'm going to be building a small shed/garden room with a 2.1m x 2.2m flat roof (i.e. 4.6 sq m). It'll be EPDM with a 1.44 degree slope and a single gutter along the back. It's in the South East.

Would 76mm mini guttering be a good solution or do I need a 112mm half round?

 

[big-all]

I'm going to be building a small shed/garden room with a 2.1m x 2.2m flat roof (i.e. 4.6 sq m). It'll be EPDM with a 1.44 degree slope and a single gutter along the back. It's in the South East.

Would 76mm mini guttering be a good solution or do I need a 112mm half round?

50mm drain pipe cut in half is more than sufficient for that size so yes 3"is fine