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🛢️ Secondary Containment (Rétention) Calculator

Enter the containers stored on one retention — get the required capacity per the French rule (référence also used in Morocco): the greater of 100% of the largest container or 50% of total volume; for containers ≤ 250 L: 20% of total (50% for flammables), min. 800 L if total exceeds 800 L.

Containers on the retention

ProductContainer volume (L)CountSubtotal (L)

Good practice checks: chemical compatibility of grouped products (acids ≠ bases ≠ oxidizers), retention material resistant to the product, no rainwater accumulation (roof or drain valve normally closed), regular integrity inspection. Sources: arrêté 02/02/1998 art. 10 & arrêtés types ICPE (FR); GBP stockage produits chimiques INRS ED 6015.