When can the simplified method of water sizing be applied?

The simplified method of water sizing can be applied specifically in one or two dwelling units. This approach is designed for smaller residential settings where the demand for water usage can be estimated more straightforwardly. It allows for a more efficient and less complex sizing process, making it practical for homes or small duplexes, where the plumbing needs are typically lower than in larger or commercial buildings.

In larger buildings, such as commercial or high-rise structures, the water usage and flow demands become much more variable and complicated due to a greater number of fixtures and diverse usage patterns. Therefore, the simplified method may not yield accurate or reliable results in those scenarios, where a more comprehensive analysis is required. Understanding the context of the building type and the expected water demands helps clarify why this simplified method is limited to one or two dwelling units.