Dig a channel or trench to a depth of about 18 to 24 inches and depending on the size of the drainage pipe 6 to 12 inches wide.
French drain around patio.
Use stakes to indicate the drain s path.
To build a french drain choose a spot with a slight downhill slope then dig a trench that is about 6 inches wide and 18 to 24 inches deep.
Fill the trench with topsoil and compact to completely cover the entire french drain system.
Fold over excess fabric lining fold excess fabric over gravel creating an overlap.
Place drain pipe atop fabric lining then add gravel covering pipe completely.
When filling the area around the inlet grate temporarily cover the grate to prevent any stones or soil from falling in.
Make sure the corrugated pipe has slots so it can drain properly.
The french drain should run from the patio area where the water pools to a lower spot on your property.
If you re installing a french drain around your foundation to prevent basement moisture take care to position the pipe below slab or finished floor level.
Leave approximately 5 between top of gravel and ground surface.
The old way of installing french drains is to do it without the gravel and the fabric.
Corrugated pipe is usually easier to work with than pvc pipe as it is more flexible and bendable.
If you need a french drain that can snake around trees or landscaping use corrugated pipe.
Without the gravel and the fabric however the drain can clog up with sand and soil over time.
The most reliable way to eliminate undesirable free standing water is to install french drains with slotted pipes filter fabric and gravel.