Do I need a well for this small french drain?


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Old 09-06-21, 12:06 PM
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Do I need a well for this small french drain?


This is the east side of my detached garage.
I've dug out the rotted siding (there is no flashing - this is OLD).
Plan was to put some PVC skirting with metal flashing down against the concrete slab.
The downspouts go into pipe that skirts the yard and then goes to a dry well, so there is *some* remediation in place, but I thought I might put in a little french drain against the side of the slab. Would this need a drain for a small 10' length? We are in the PNW and it is usually rainy.
 
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Old 09-07-21, 05:47 AM
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I would NOT direct the water up next to the foundation. Take it further away from the house before installing a French drain.
 
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Old 09-07-21, 07:09 AM
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You could install a small (12"x12") catch basin below the downspout with a shallow french drain into the side. You might even be able to just run the swale with gravel to the catch basin and not even need a perforated pipe.



The pipe shown would be the existing drain from the downspout. An additional french drain pipe (if needed) would enter on the blank side.
 
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Old 09-07-21, 01:20 PM
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Sorry for being unclear. The downspout goes to a dry well far away from the foundation of the main house, so that is not an issue. This is just for a below grade side of my detached garage that is 12' wide. The siding will be replaced by PVC skirting that goes down beside the slab.
 
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Old 09-08-21, 07:04 AM
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The downspout goes to a dry well far away from the foundation of the main house
The pipe shown in the catch basin picture would be the one that now goes to the existing dry well. The existing down spout could be terminated as shown or could be piped directly into the catch basin. The water from the side of the garage could run in a swale on the surface to the catch basin or a french drain along the side could be attached to the side of the catch basin.
 
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Old 09-08-21, 01:23 PM
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2john02458 Ah I misunderstood. Something like this then?

Downspout into Drain into pipe that goes to Dry Well?
 

Last edited by AbeLovesFixing; 09-08-21 at 02:15 PM.
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Old 09-09-21, 10:05 AM
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I do not understand your drawing. This is what I described.




Siding will still get wet from falling water splashing so use appropriate materials to replace siding.
 
 

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