The pressure at a sprinkler can be calculated using the formula P=Q²/K², where P is the pressure in psi, Q is the flow rate in gpm, and K is the K-factor of the sprinkler. Substituting the given values (Q=33 gpm, K=5.6) yields a pressure of approximately 22.3 psi.
References: Basic hydraulic principles applied in the design and analysis of sprinkler systems as outlined in NFPA 13.
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