Generally the depth ranges from 10" to 24" for 4" pipe.
But that depends on 3 key factors:
1. type of soil. (clay or loam)
2. Slope of teraine
3. amount of rainfall
In loamy soil where water penetrates soil rapidly and sinks down deep, the depth of trench might go as much as 3 to 4 feet which also relates to the slope of the property.
if your under lament is sunk in a bowl as you mention, then you intend to draw the water away from your "bowl" before it reaches your perimeter, so your trench should be as or deeper than the lowest part of your foot print.
In a clay soil where water tends to run off faster than it sinks, the opposite is true.
A shallow trench can be effective, so as little as 8", to 10" depth does the job.
Another solution which you may consider (depending on your homes foot print and lay of the land, is to create a "main-drain" rather than a french drain.
if the center of your bowl is like 20' or less from outer perimeter, you can practically (assuming you have a workable crawl space, dig a trench 6" deeper than the lowest point under your house, and straight out (under your foundation footing) to the front or rear of your property whichever is lower part of the topography. Then terminate that pipe in a basin.
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Posted by: stratmister@gmail.com
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