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Gutter water over shooting problem


We have had gutters installed and are having trouble with water overshooting the gutter during anything beyond a very light rain.

This is a large metal roof with what looks like to me a low pitch. I am trying to find the formula for gutter installation to find out why this isn't working, but no formulas seem to account for metal and the velocity the water is shed. Is this normally not a consideration and our installation is wrong somewhere or do we need to do something different for this installation. The gutter itself is not overflowing when clean and open in a moderate rain, but the water will actually sluice down in rivulets and actually miss the gutter altogether.

I'm attaching some measurements, for some reason the forum is saying my gif and jpeg files are invalid image files; I try to post photos later. It looks like in our area of Western NC we are looking at 55-60" of rain per year and a 5 min. downburst of 8.5"/hr. if this is what I need to calculate the gutters.

Any help would be greatly appreciated.

See photos here: https://www.flickr.com/photos/[email protected]/



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