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slvrbullet98 05-05-2009 10:08 AM

Replacing patio - Relocate downspout
Our existing patio (patio blocks) is going to be replaced with pavers because it is sloping toward the house. We are also going for a more curved look with a sitting area.

Currently the downspout extension goes across the patio (great design!) I would like to go underground, but not sure exactly what I need. I have contracted the gravel/sand prep and pavel laying, but I need to do the downspout relocation on my own. There is no way of a different location of the downspout from the gutter due to the roof slope. We live in northern Wisconsin so we have cold winters and quick thaws.

The new patio will go out from the house about 15-20 ft. What type of drainage attached to the downspout should I use, what materials, how far should I extend from the end of the patio, How deep should I put whatever is recommended. I'm a newer home owner and looking for some advice on what I should do to get the downspout extension out of sight and not across my about to be put in beautiful patio. Thanks for the help.

Aggie67 05-05-2009 03:22 PM

Drainage isn't rocket science. If you can't run the gutter water away from the downspout and foundation via the surface, then it has to run underground. You're talking about a subsurface drain pipe. I have a system that runs all around my house, pool, and spa, and terminates at the curb. I live in NJ, and the pipes are only a foot or so under the grass. Haven't had a problem, but if I was the homeowner that originally did it, I'd have gone down another foot or two. I've got 9 feet of elevation difference between the first drain head and the curb.

If you're really set on doing it underground, you need to collect the following info and post it here.

1. What is the height difference between the surface of the patio at the downspout, and the lowest point of your yard. Hopefully that low spot is the street. You can use the ancient Egyptian garden hose method of checking elevation difference. Post back if you need an explanation.
2. Walk out the shortest route from that downspout to the low point, and make sure there are no utilities crossing that line. In NJ we have New Jersey One Call, where you call them and they come out and mark out all of the utility runs (water, gas, electric, etc). You should have that in your state. Have them come out and do the markouts so you know where your utilities are. Septic is your baby, if you have it, and they won't mark that out. Be careful on that one.

A dry well is also an option, but there are a couple of tests and calculations that have to be looked at in order for that to work. Let's cross that bridge later.

slvrbullet98 05-08-2009 08:30 AM

My yard is pretty flat. The new patio will slope the standard couple of inches per. The patio is in the middle of the back of the house so it would be a lot of digging and piping to go all the way around the house to get to the street.

I don't have septic so that is not a problem.

The ground is relatively sandy due to the gravel quarry about a city block away. My sump never ever runs even in heavy rains/thaws and I have aways had a dry basement.

I was thinking about routing the downspout to one of those pop-up drains. in the yard. How far do I need to be away from the patio? Should I use PVC with holes down or solid PVC to the popoff? Do I even need a popoff if I go out far enough?

Looking to install this weekend or next week.

Thank for the help.

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