Point "A" on the water supply graph represents the static pressure. Static pressure is the pressure in the water supply system when no water is flowing. It is typically the highest pressure reading on the graph, measured before any hydrants are opened for testing or fire suppression activities. Understanding static pressure is crucial for designing fire protection systems and ensuring adequate water supply and pressure is maintained throughout the fire suppression operation as outlined in NFPA 13, Standard for the Installation of Sprinkler Systems.
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