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RE: French drain installation

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Are these now to be referred to as "freedom drains" in the U.S.? Just
kidding.....

Brent Koch
Livermore, CA


-----Original Message-----
From: Cratylus Consulting Group [mailto:cratylus(--nospam--at)earthlink.net] 
Sent: Tuesday, July 08, 2003 09:11 AM
To: seaint(--nospam--at)seaint.org
Subject: Re: French drain installation


Good point!
A "french drain" is not a "back drain" or wall drain.

Steven A.
Los Angeles

"Sprague, Harold O." wrote:

> Desi,
> I am a little confused.  Are you installing a French drain or just 
> providing a continuous perimeter wall drain?
>
> There is no standard of care, but I can offer what I have done in the 
> past for a continuous perimeter wall drain. I provide filter fabric in

> the base of the excavation and use 3/8" open graded clean crushed rock

> at the base lay the pipe at (1/4" ideal 1/8" after the war) per foot.

> I use enough filter fabric to wrap all of the crushed rock.  After the

> pipe is placed I back fill with more crushed rock to provide a minimum

> of 12" of rock around the pipe.  I then finish wrapping the crushed 
> rock in filter fabric and lap the fabric over the crushed rock. This 
> wraps the entire crushed rock in filer fabric.  If you just wrap the 
> pipe, the filter fabric has much less surface area and will seal with 
> fines rather quickly.
>
> If you are indeed considering a French drain, you should run your 
> perimeter wall drain to the French drain.  The size of the French 
> drain and location will depend on the water table and the percolation 
> rate of the soil.  I would avoid making the perimeter wall drain the 
> French drain. You will wind up with a pool of water along your wall.
>
> If indeed you have a retaining wall, just run your continuous wall 
> drain to weeps placed at about 10' centers.
>
> Regards,
> Harold O. Sprague
>
> -----Original Message-----
> From: djkiss55(--nospam--at)juno.com [mailto:djkiss55(--nospam--at)juno.com]
> Sent: Monday, July 07, 2003 1:13 PM
> To: seaint(--nospam--at)seaint.org
> Subject: French drain installation
>
> Any response to these issues is gratly appreciated.
>
> What is the standard of care for installing a 4" dia. french drain 
> along a 70 foot-long by 9 foot high masonry retaining wall? Are there 
> any gravel or crushed rock specific requirements? What is the minimum 
> slope required by the standard of care? Is a 1/4" slope appropriate?
>
> Thank you in advance.
>
> Desi J. Kiss, MS, PE
> Phone: 949/458-9169
> E-mail: djkiss55(--nospam--at)juno.com
>
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