Drainage under paver patio

[Glenn Lawn Care]

Originally Posted by rpearlberg

So there's no need for actual drains under the patio with the gutter downspouts tied it (to get the gutter water off of the patio).

I just built a paver patio, and with the proper drainage you should have no problems. Where the water runs off the patio there is a french drain that I also installed. We have had heavy rain since I built it 3 weeks ago and it seems to be fine.

[DVS Hardscaper]

You need to be careful with drywells by dwellings. Concentrated water in the drywell could find its way to the basement. If you do a drywell, you need to pipe the water far from the dwelling.
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[AztlanLC]

By looking at the pictures I can see water travel from on end of the house to the other my advice for a long lasting installation catch the water before it gets to the patio, catch basin or channel drain, run solid pipes under the patio, connect gutters and daylight to the other end far away from the house , how big of a catch basin? well you have to measure the area and calculate how much run off will be, but I can assure you it needs some type of drainage.

[AztlanLC]

build it once build it right it might not show in 3 weeks a month or maybe a year but I can see many issues there.

[alldayrj]

While were on the subject Anyone have a formula for sf of drainage area to gallons in a drywell?
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[AztlanLC]

I haven't seen a specific formula myself but some other members migh know it, what I do know it's basec on the type of soil you have and the percolation rate of the site, it's like when building a leach fill you have to do some test holes

[alldayrj]

Yea I'm just looking for something general. I always dig to sand anyway
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[AztlanLC]

http://www.poribesh.org/Documents/drywell.pdf

This you shoul reas tough

[alldayrj]

its all in metric speak, and says to inspect your drywell 4 times per year, no thanks haha

[Moneypit]

I'm almost certain that you have to design a drywell to handle a 4" rainfall here in NY.