Excavation Footprint: Crate vs Concrete vs Gravel

Excavation volume is typically the largest line-item cost driver on an underground stormwater project. Enter your required storage volume to compare the excavation footprint of three common system types, using the multipliers from the decision matrix above.

Required Storage Volume (m³)

Modular Crate1.05× multiplier

—

Gravel Infiltration~1.5× multiplier

—

Precast Concrete2.63× multiplier

—

Request a site-specific excavation take-off →

Basis: 1.05× / ~1.5× / 2.63× are the excavation-to-storage-volume multipliers published in the decision matrix above — industry benchmark figures, not a project-specific take-off. This compares relative excavation footprint only, not dollar cost, since excavation rates vary by region. Precast concrete’s longer 75+ year design life is a separate trade-off — see the comparison discussion above.