A Class 3 operator isn't just checking one pipe or one tank — they're responsible for how multiple pressure zones, storage facilities, and demand types interact across an entire system. The math at this level shifts from a single chained calculation to combining several pieces of system data into one operational answer: total system demand across zones with different usage patterns, a full accounting of where produced water actually goes (the water audit), and whether the system can simultaneously meet everyday demand and a fire event. These are the calculations that show up in capital planning, regulatory reporting, and day-to-day operational decisions about pump staging and storage drawdown.
Multi-Zone System Demand
A distribution system is rarely served by a single uniform demand pattern. Different pressure zones — separated by elevation, PRVs, or physically distinct sources —