You can double check the fall with your spirit level.
Install gutter downpipe.
Watch and learn how and stop.
Gutters over flows add downspout to bring water down from roof faster.
Cut it to length with a hacksaw and removing any burrs with a half round file.
Measure in 4 inches from the end corner of.
Its easy less than 30 minutes and under 30 00 in parts.
How to add a downspout in an existing gutter step 1.