Which factor will NOT affect hydrant effectiveness?

The factor that will not affect hydrant effectiveness is whether it is a wet or dry hydrant. A wet hydrant is typically always filled with water from the water main, making it ready for immediate use during firefighting operations. In contrast, a dry hydrant is usually used to connect to a static water source, such as a pond or reservoir, and relies on external factors like gravity or a pump to bring water to the hydrant.

While the design (wet or dry) influences how quickly water can be accessed, both types of hydrants can ultimately serve their purpose in providing water for firefighting. The effectiveness of a hydrant in practice is more influenced by factors such as water flow rate, hydrant location, and the size of the hydrant, which directly affect the volume of usable water and the efficiency with which it can be delivered to a fire.