OSD Storage Volume (SSR) Quick Estimator

Storm Manager Module

A rough, Swinburne-method-style estimate of your Site Storage Requirement — for budgeting and product shortlisting only. Your NSW-registered hydraulic engineer must confirm the final design figure for DA submission.

This tool applies a simplified equivalent-impervious-area calculation (roof x 1.0 + paved x 0.9 + grassed x 0.75) against illustrative rainfall/PSD bands. It is not a substitute for a full Swinburne Method / ARR hydraulic calculation, and councils will not accept this output as a design certificate. Use it to shortlist a module configuration before requesting a formal quote.

Roof area (m²)

Paved / driveway area (m²)

Grassed / landscaped area (m²)

Design rainfall intensity band

Assumed PSD factor (L/s per m² EIA)

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Estimated Site Storage Requirement (litres) — order-of-magnitude only

Get an engineer-grade figure and module configuration: Request a Project Quote →