Define bund dimensions and calculate areas instantly here. Export results, share plans, reduce waste fast. Build safer containment zones using practical field inputs easily.
| Scenario | Shape | Inputs | Key output |
|---|---|---|---|
| Fuel tank bund | Rectangular | L=8 m, W=6 m, Depth=0.6 m, Freeboard=0.1 m | Area=48 m², Effective volume=24 m³ |
| Chemical tote pad | Circular | Diameter=5 m, Overlap=10%, Waste=5% | Area=19.635 m², Liner area≈22.8 m² |
| Irregular berm | Custom area | Area=120 m², Depth=0.45 m | Gross volume=54 m³ |
A containment area limits the spread of fuels, chemicals, and sediment-laden water during storage, maintenance, and refueling activities. Proper sizing reduces cleanup time, protects drainage systems, and supports site environmental controls. When bunds or berms are used, the internal plan area is the effective capture zone, not the outside wall dimension.
Rectangular layouts suit pads and tank farms because they match slab geometry and simplify setting out. Circular layouts fit around vessels or ring bunds, giving consistent setbacks from the source. Trapezoidal plans are useful where boundaries taper or where a channel-like containment is formed. For irregular boundaries, measured area from survey or drawings provides reliable inputs and avoids repeated field measurements.
Liner takeoff should include seam overlap, edge turns, and trimming losses. A safety factor accounts for detailing, wrinkles, and field tolerances that reduce usable coverage. Overlap and waste allowances are applied as multipliers to the base area, creating a practical order quantity. If your design includes vertical returns or anchor trenches, add those surfaces separately, then apply the same allowance logic to maintain consistency.
Area alone is not enough when storage volume must be retained. Gross volume is area multiplied by depth, while effective volume subtracts freeboard to keep the liquid level below the crest. Freeboard also provides tolerance for wave action, pump surge, and uneven settlement. Entering depth and freeboard helps compare alternative wall heights and quickly identify whether a layout can meet target retention.
Outdoor containment often needs additional allowance for rainfall captured within the bund. A simple approach adds rain depth multiplied by plan area to the required volume, then compares it to the effective volume. This supports seasonal planning, inspection routines, and dewatering strategy. Pair the output with clear signage, regular housekeeping, and documented inspection intervals to demonstrate diligence and keep containment fully functional under changing site conditions.
Base area is the plan footprint. Liner area includes overlap, waste, and safety multipliers so you order enough material for seams, trimming, and field tolerances.
Enter them when you must verify liquid retention. Depth gives gross capacity, and freeboard reserves height below the crest for overtopping tolerance and operational safety.
Rain allowance is calculated as rain depth times plan area. It is added to container-based requirements, then compared against effective volume to check if the containment remains adequate outdoors.
A common planning approach is 110% of the largest container volume, but site rules may vary. Adjust the factor to match your project requirements and operational risk level.
Yes. Custom area is ideal for irregular footprints from survey, CAD, or GIS. Perimeter is not calculated, but liner allowances and volume checks still work reliably.
A shallow depth, large freeboard, significant rainfall allowance, or a big container requirement can exceed effective volume. Increase wall height, adjust layout, or add dedicated sump capacity.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.