How to Calculate Excavation
Bank Volume: L x W x D / 27 = cubic yards (in-place)
Loose Volume: Bank volume x Swell factor
Compacted Volume: Bank volume x 0.85 (shrinkage)
Swell Factors by Soil Type
- Sand/Gravel: 10-15% swell
- Common Earth: 20-30% swell
- Clay: 30-40% swell
- Rock: 40-65% swell