Soakaway Crate Volume & Quantity Estimator

Enter the contributing paved or roof area and a design rainfall intensity to get a quick storage-volume estimate and an indicative crate count at Storm Manage’s 95% void ratio (1000×500×500mm module). This is a planning estimate — final sizing must follow a site-specific BRE Digest 365 percolation test.

Contributing Area (m²)

Total roof or paved area draining to this soakaway.

Design Rainfall Intensity

Use the design intensity specified by your local drainage authority.

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Required Storage Volume (m³)

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Indicative Crate Count

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Approx. Module Layer Footprint (m²)

Formula: Storage Volume = Area × (Rainfall Intensity ÷ 3000). Crate count = Storage Volume ÷ 0.2375m³ effective storage per module (95% void ratio). This estimate assumes a single-layer or stacked configuration typical of residential/light-commercial projects — final layer configuration, cover depth and load class depend on your percolation test result and site constraints. Request a design review & formal quote →