Public Health
Cold Water Storage Tank Calculator
Estimate cold water storage tank capacity from daily demand, storage period and reserve allowance.
Use this calculator for early-stage cold water storage sizing where a project daily demand is known or has been estimated separately. It can be used to assess the required stored volume for a chosen storage period together with an additional reserve allowance.
Inputs
Effective volume factor allows for freeboard, dead volume and practical usable storage below nominal tank capacity.
Result
Method
Stored demand is estimated from the selected storage period as a proportion of the daily demand:
A reserve allowance is then added:
Nominal tank capacity is then adjusted for usable volume:
- Stored Demand = demand to be stored for the selected period (L)
- Reserve = additional reserve allowance (L)
- Required Stored Volume = total effective stored volume required (L)
- Tank Capacity = nominal tank volume allowing for usable volume factor (L)
- Calculated result = -
Reference
- This calculator provides an indicative cold water storage volume based on daily demand, storage period and reserve allowance.
- Storage strategy should be agreed with the project brief, incoming supply conditions, utility authority requirements and resilience expectations.
- Usable tank capacity is often less than nominal capacity because of freeboard, dead water level and practical outlet arrangements.
- Relevant guidance may include BS EN 806, the Water Supply (Water Fittings) Regulations and project-specific water authority or client criteria.