1. Mark the Trench: Use stakes and string to mark the path of the trench according to your planned design. Ensure that the trench follows the desired slope and avoids underground utilities.
2. Excavate the Trench: Dig the trench to the required depth and width. The depth will depend on the water table’s depth, the pipe’s slope, and the desired location for the drainage outlet.
3. Add Gravel or Rock: Place a layer of gravel or rock at the bottom of the trench, ensuring it’s level and evenly distributed. The depth of the gravel layer will vary based on the soil conditions and the size of the gravel used.
4. Lay the Perforated Pipe: Position the perforated pipe on top of the gravel layer, following the desired slope. Connect multiple sections of pipe using appropriate connectors or couplings.
5. Cover with Gravel or Rock: Fill the trench with additional gravel or rock, ensuring the pipe is surrounded. The depth of the gravel fill will depend on the desired cover and the size of the gravel used.
6. Install Geotextile Fabric: If desired, place a layer of geotextile fabric on top of the gravel or rock fill to prevent soil or debris from entering the system. Trim the fabric to fit the dimensions of the trench.
7. Backfill and Compact: Fill the remaining space in the trench with soil, ensuring proper compaction to prevent settling. Use a tamper or compactor to compact the soil in layers, ensuring stability and proper drainage.
8. Test the System: Once the French drain is installed, test the system by pouring water into the trench or using a hose to simulate rainfall. Observe the flow of water and check for any leaks or blockages.