French Drain Calculator - Calculate Drainage System Materials
Free calculator to determine pipe length, gravel volume, and material costs for effective drainage system installation and water management
Updated: December 2024 • Free Tool
French Drain Calculator
Results
Gravel Volume
0 cu yd
Pipe Length 0 ft
Trench Area 0 sq ft
Fabric Area 0 sq ft
Pipe Cost $0
Gravel Cost $0
Fabric Cost $0
Total Cost $0
Frequently Asked Questions (FAQ)
Q: What is the typical trench width for a French drain?
A: A typical French drain trench is 6-12 inches wide. The width should be at least 3 inches wider than the pipe diameter on each side for proper gravel placement.
Q: How deep should the gravel layer be in a French drain?
A: The gravel layer should be at least 3-6 inches deep above the pipe and extend 6-12 inches below the pipe for proper drainage and protection.
Q: What type of pipe is best for French drains?
A: Perforated PVC pipe (4-inch diameter) is most commonly used for French drains due to its durability, affordability, and excellent drainage properties.
Q: Do I need landscape fabric for a French drain?
A: Yes, landscape fabric is essential to prevent soil from clogging the gravel and pipe perforations, ensuring long-term drainage effectiveness.