I just happen to be working on replacing downspouts and I ran across these
I wonder how much water they can handle?
I may try hanging a chain from the downspout and see what happens?
Since they're not closed, it's limited by the gutter opening. What
doesn't go through the openings in the cups of the pictured type will
overflow and fall since there's nothing to retain it when/if they fill
Fine Homebuilding had an article and some really outstanding art in an
issue a year or so ago...
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