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Soakaway Crate Volume & Quantity Calculator

Estimate required storage, crate count and excavation footprint for a StormGrid modular soakaway.

1. Sizing basis

Impermeable area (rule of thumb)

Known storage volume

2. Impermeable area draining to soakaway

Roofs, drives and paving in m². Applies the English rule of thumb of ~1 m³ of soakaway per 50 m² of impermeable area — a preliminary figure only.

3. Crate module

Both modules carry a 95% void ratio, so ~95% of the box volume becomes live storage.

Enter your figures and press Calculate to size the soakaway.