Excavation Volume Calculator Guide
Understanding Excavation
Excavation isn't just about digging a hole; it's about managing the dirt you remove. Soil expands when you dig it up ("swell") and shrinks when you pack it back down ("shrinkage").
The Swell Factor
When earth is in the ground, it is "Bank" volume. When you dig it up, it becomes "Loose" volume.
Bank Volume = Length × Width × Depth
Haul Volume = Bank Volume × (1 + Swell %)
Typical Swell: 20-30% for topsoil/clay.
This means if you dig a 10-yard hole, you might need a dump truck that can carry 13 yards to haul the dirt away!
Excavation Safety
Call Before You Dig
In the US, dial 811 a few days before digging.
- Free service to mark utility lines.
- Hitting a gas or power line can be fatal.
Trench Safety
Trenches deeper than 5 feet require protection.
- Slope: Angle the walls back.
- Shoring: Use supports to prevent collapse.