Calculates the materials needed for a French drain, including gravel, drainage pipe, and geotextile fabric.
Start with your values, or try a preset.
Enter Drain Length, Drain Width, Drain Depth, Gravel Void Ratio, Drainage Pipe Diameter, and Geotextile Fabric Overlap in the units shown.
Read Geotextile Fabric Length, Geotextile Fabric Width, Drainage Pipe Length, Gravel Volume Needed, Geotextile Fabric Area Needed, and Gravel Volume Needed (Cubic Yards) in the results panel. Results update as you change the inputs.
Choose a preset to load an example, then adjust the values for your situation.
See the inputs and their calculated results.
Drain Length: 10 feet; Drain Width: 1 feet; Drain Depth: 1 feet; Gravel Void Ratio: 0.35; Drainage Pipe Diameter: 4 inches inches; Geotextile Fabric Overlap: 0.5 feet
Geotextile Fabric Length: 10.5 feet; Geotextile Fabric Width: 4 feet; Drainage Pipe Length: 10 feet; Gravel Volume Needed: 10 cubic feet; Geotextile Fabric Area Needed: 42 square feet; Gravel Volume Needed (Cubic Yards): 0.3703703704 cubic yards
Drain Length: 25 feet; Drain Width: 1 feet; Drain Depth: 1 feet; Gravel Void Ratio: 0.35; Drainage Pipe Diameter: 4 inches inches; Geotextile Fabric Overlap: 0.5 feet
Geotextile Fabric Length: 25.5 feet; Geotextile Fabric Width: 4 feet; Drainage Pipe Length: 25 feet; Gravel Volume Needed: 25 cubic feet; Geotextile Fabric Area Needed: 102 square feet; Gravel Volume Needed (Cubic Yards): 0.9259259259 cubic yards
Drain Length: 50 feet; Drain Width: 1 feet; Drain Depth: 1 feet; Gravel Void Ratio: 0.35; Drainage Pipe Diameter: 6 inches inches; Geotextile Fabric Overlap: 0.5 feet
Geotextile Fabric Length: 50.5 feet; Geotextile Fabric Width: 4 feet; Drainage Pipe Length: 50 feet; Gravel Volume Needed: 50 cubic feet; Geotextile Fabric Area Needed: 202 square feet; Gravel Volume Needed (Cubic Yards): 1.851851852 cubic yards
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