Dale's self flushing roof gutters.
I was cleaning out roof gutters yesterday, and contemplating how a system could be devised to render my services obsolete. There are a dozen different gutter guard systems which work with varying degrees of success. These systems rely on wind blowing accumulated debris off of the roof and across the perforated guard. They work great in areas that have mostly deciduous
trees and in areas that have a dry autumn with some wind.
Many homes on the west coast of North America receive lots of wet conifer needles which tend to clog up the little pours of gutter guards and then trap other debris that fails to be blown over. Cedar waste sits flat and resists being blown down. The rotting mess can form a cementitious mat which causes heavy rains to wash over the gutters and onto the fascia. Sometimes large amounts of crap gets under the guards and forms a layer of soil there.
The Solution
I'm not a fan of downspouts. I prefer to run the gutter a few feet past the roof's end and then allow the
water to shoot onto a rock pile or
pea gravel absorption field. Mine will
feed a rubber lined seasonal stream that runs into a
pond about 100 ft away. It would make no sense to save the seasonal deluge in my region using barrels or a cistern. Most problems with roof drainage have to do with poorly designed and maintained downspouts which clog with debris and cause the system to overflow. An open gutter with no end caps is far less likely to be clogged with crap. But even an open gutter will slowly fill with needles and other fine particles when slow, steady rain doesn't create
enough flow to wash the stuff out.
ENTER THE INTERMITTENT GUTTER FLUSHER.
If you've ever been to a Japanese garden, you've probably seen a water feature that included a bamboo
bucket that is slowly filled until it reaches a point where it tips over on it's hinge and dumps a load of water into the
pond or stream. A variation of this could be installed at the end of a gutter furthest from the outlet. The abrupt addition of water would create a wave which would dislodge loose material in the gutter. During a rain, the bucket would flush the system every few minutes. When I clean gutters, I find that a surge of water moves the final bits toward the downspout. When a garden hose is allowed to run continuously, the water flows over or around stubborn bits. Saturated acorns mixed with fir cones are the worst. A roof mounted device could be made from aluminum or stainless steel. Flat stock of the same material could be run under the shingles on the part of the roof above the bucket. The flat stock would be formed to create a spout that fills the flushing pail. You would soon be able to determine how hard it is raining by timing how long between flushes. Why bother with cable or internet ? (: Unsuspecting visitors could be sent to collect a pail of water from the regular stream coming from the gutter about a minute before a flush. Great fun.
Here 's an example
https://www.youtube.com/watch?v=Oi483GlQ5Rk