What do color codes on the bonnet of a hydrant indicate?

The correct answer highlights that color codes on the bonnet of a fire hydrant indicate the available flow from the hydrant. This system is part of the National Fire Protection Association (NFPA) standards, which establish a color coding system to provide valuable information for firefighters regarding the hydrant's capabilities.

Colors ranging from red to light blue signify the flow rates, with each color corresponding to specific flow ranges measured in gallons per minute (GPM). For example, a hydrant painted in light blue may indicate a flow capacity of over 1500 GPM, while red might indicate a lower capacity, such as under 500 GPM.

Understanding the flow capacity is crucial for firefighters as it helps them assess whether a particular hydrant can supply sufficient water for firefighting operations in a given situation. This information can influence tactical decisions during an emergency response.