On Saturday, January 30, 2016 at 12:30:18 PM UTC-5, wrote:
On Sat, 30 Jan 2016 07:53:15 -0800 (PST), wrote:

On Friday, August 18, 2000 at 7:38:07 PM UTC-5, Charles wrote:
I need to add about 25 feet of gutter to a screen porch I'm building. Does
anyone know the magic number for how much slope it should have towards the
downspout?

Thanks a ton:

Charles
ideal is about 1/16" per foot, so roughly 1.5 inches drop in 25 feet
would do it.

I think gutters work best when the drop is smooth. ;-)