Due to the structure of a french drain the backfill will include smaller gravel size stones towards the top of the trench.
Gravel size for french drain.
Options for the bottom of drains.
Areas that will see especially heavy flow may need larger gravel.
If aggregate of different sizes is used smaller pieces usually go closer to the pipe while larger pieces sit closer to and on the surface.
The drain is rather simple in design and construction and consists of a trench filled with rock or gravel.
What size gravel should i use for a french drain.
The size of the gravel used can vary from pea gravel to larger pieces of river rock.
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A french drain offers a gravity assisted means of keeping the yard free from excess moisture.
Size and type of gravel for a french drain.
A french drain sometimes called a dry well allows surface water to drain into the ground to alleviate water problems.
While several sizes and types of gravel may be used for the drain your best option may depend upon the slope of the yard and whether you use a perforated pipe to help whisk the water away.
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Depending on the size of your yard and the scale of your drainage issue you can purchase the pipes and equipment to create a french drain yourself.
French drain pipe length.
For example a french drain without perforated pipe needs 1 inch gravel.
In general you want to aim for inch to 1 inch gravel for drainage.
These should be similar in size shape and density to river gravel.
Using pea gravel modern french drains have perforated plastic piping as a significant part of the design.
A ditch is dug protected piping laid in the ditch and the pipe covered.
A french drain is a trench filled with a perforated pipe and gravel that allows water to drain naturally from your yard.
This is covered above and really depends on a project s specific.
Or projects without drainage pipes may also need larger gravel.
As you move towards the bottom of the trench larger course stones should be used to compliment the natural filtration of water.