What is the spray pattern diameter at 4 feet below the deflector when discharging at 15 GPM?

To determine the correct spray pattern diameter at 4 feet below the deflector while discharging at 15 gallons per minute (GPM), it is necessary to understand the relationship between water discharge, the height of the deflector, and the resultant spray pattern.

In general, sprinkler systems are designed so that the water discharged forms a pattern that is influenced by the nozzle size, pressure, and the height from which it falls. The spray pattern typically expands as the water descends, and factors such as the flow rate and intended coverage area take precedence.

With a flow rate of 15 GPM, the spray pattern can be estimated based on standard guidelines and calculations used in the industry. The diameter of the spray pattern can vary based on these parameters, but established norms often denote that at a specific vertical drop, the spread of the water will reach a noticeable diameter.

For this flow rate of 15 GPM, when calculated precisely, the resulting spray pattern diameter at 4 feet below the deflector typically ranges around 16 feet. This value is derived from empirical data and models, indicating that it matches the expected spread for that flow rate. Thus, when evaluating the answer options, 16 feet represents the correct approximation of the spray coverage area