Estimate the nominal tank capacity needed to buffer water treatment product water demand while accounting for emergency reserve, usable tank volume, and a design safety factor.
The main result is a planning estimate for required nominal storage. Review the secondary values to verify that the implied flow, volume, or cost basis matches the intended operating case.
Planning estimate only. Site conditions, feedwater quality, permits, equipment curves, redundancy, and applicable engineering standards may change the final design.
For 500 m³/day, 1 buffer day, 1 reserve day, 90% usable volume, and 10% safety, nominal storage is 1,222.2 m³.
Yes. The reserve-days input is added to the normal operating buffer before the safety factor is applied.
Use the demand rate that the tank must actually cover. Peak-day demand is safer when downstream use varies substantially.
Enter the usable-volume percentage. The calculator divides required usable water by that fraction to estimate nominal tank size.
Yes. Divide the nominal capacity by the number of equal tanks, while allowing for any tank that must be offline during maintenance.
No. It is a planning estimate; verify turnover, pressure, fire code, seismic, and process requirements with the project engineer.
| Variable | Unit | Use |
|---|---|---|
| Product water demand | m³/day | Expected downstream water demand. |
| Operating buffer | days | Normal storage coverage. |
| Emergency reserve | days | Additional contingency coverage. |
| Usable tank volume | % | Fraction of nominal volume that can be used. |
| Design safety factor | % | Extra allowance for uncertainty. |