I have 5 inch "K-style" vinyl gutters on our house. To keep leaves and fir
needles out of the gutters, I have vinyl screens covering the top of the
gutters. They generally work well, except on the front and back of the
house where the roof valley's are.

The valley's channel a larger volume of water into one spot, and in some of
the significant rain storms, there's so much flow it overflows the gutter
at the point going all over the yard and down the side of the house.

To make matters worse, the valley's also collect larger amounts of fir
needles which get washed down and pile up on top of the gutter screen. This
basically builds a ramp for the water to come down the valley and straight
over the top of the gutter.

I could probably remove the gutter screen in that spot and collect more
water, but it would also allow debris to get in and clog up the gutters.

Any tips on what I can do to solve the problem? (Replacing the gutters is
not an option at this point).

Thanks,

Anthony