French Drain Calculator
Calculate French drain dimensions, gravel volume, pipe requirements, and drainage capacity with our comprehensive calculator. Plan your drainage system for optimal water management and foundation protection.
Step 1: Drain Specifications
100 mm
Standard Drain Specifications
Typrench French drains: 30-60cm depth, 30-45cm width. Pipe diameter: 100-150mm. Slope: 1-2% gradient for proper drainage.
Step 2: Material Specifications
2%
Optimal Drain Design
Maintain 1-2% slope for proper water flow. Gravel should surround pipe completely. Filter fabric prevents soil clogging. Depth depends on frost line and drainage needs.
French Drain Calculation Results
Summary
Cross-Section
Material Comparison
Total Gravel Required
1.8 m³
10m drain × 30cm width × 60cm depth
Pipe Length
10.0 m
Gravel Volume
1.8 m³
Fabric Area
6.5 m²
Drainage Capacity
Good
Drain Cross-Section Visualization
Pipe Placement
Bottom 1/3
Water Flow
Optimal
Clog Resistance
High
Frost Protection
Adequate
Gravel Type Comparison
| Gravel Type | Drainage Rate | Cost per m³ | Best For |
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