Installing a drain begins with planning the drainage path by identifying where water is collecting and choosing a route that slopes gently away from structures or low areas. Once the path is marked, a trench is dug, usually about six to twelve inches wide and eighteen to twenty four inches deep, with a consistent slope of approximately one percent to ensure proper water flow.
The trench is then lined with permeable landscape fabric to prevent soil from entering and clogging the system. A few inches of clean three quarter inch crushed rock are placed at the bottom to create a stable base. A perforated pipe is then laid on top of the gravel with the holes facing downward to allow water to enter the pipe.
More gravel is added to cover the pipe, stopping a few inches below ground level. The fabric is folded over the gravel to help keep debris out. Finally, the trench is filled with soil, sod, or decorative rock to restore the surface and complete the installation.