Originally Posted By: roconnor
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Erby … I don’t think they really are diverters … just me thinking out loud about that as an option to work as an overflow …
Joe ... the problem with these piped roof drainage systems is not the gutters or downspouts, which are easily cleaned (I agree ya have to get up there and clean them out). The problem is the below grade portion that gets clogged over time from leaves, pine needles, dirt, moss, twigs, and other debris.
Cleaning the roof/gutter/downspouts with a hose actually makes this worse since it washes all the debris into the below grade piping and drywells. And just sticking a hose into the piping/cleanouts does little except maybe help fill the system and move the debris to the drywells which eventually get clogged.
These systems need occasional maintenance by a plumber similar to a septic system, where the piping needs to be snaked out and the cover pulled off the drywell (assuming there is one) to clean that out. Homeowners just never seem to do this until there is a major problem ... outa sight, outa mind ...
When I am called in to evaluate a basement with foundation problems and water penetration issues, and I spot the downspouts connected to below grade piping/drywell systems on an older house, I can usually guess what the problem is with the water penetration even before I check things out.
Ensuring that adequate gutters/downspouts are installed and kept clean, that splashpads are installed which discharge a good distance away from the foundation, and the area around the foundation is graded away from the house solves most of the basement water penetration problems (along with another inexpensive trick I use sometimes as a fix). Any of these alone doesn?t work well, but all combined together usually works good for rainwater. A relatively maintenance free system too except for cleaning the gutters/downspouts ... which most good homeowners will do ...
Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong