💧 Drainage Calculator
Calculate gravel, pipe, and fabric for French drains and drainage systems.
Enter Trench Dimensions
Drainage Guide
📏 Trench Sizing
- 6-9" wide - Standard residential
- 12" wide - Heavy clay soil
- 18"+ wide - Large water volume
✅ Installation Steps
- Call for utility locate
- Mark trench path with slope
- Excavate to depth
- Line with fabric
- Add 2" gravel base
- Lay perforated pipe
- Cover with 6-12" gravel
- Wrap fabric and backfill
⚠️ Common Mistakes
- No slope (must be 1/4"/ft)
- Using wrong gravel
- No fabric separator
- Forgetting outlet