What is an elevating water tower system designed for?

An elevating water tower system is primarily designed for the deployment of elevated master streams. This system allows firefighters to deliver water from a height, enabling them to reach fires that may be difficult to attack from ground level. By employing elevated master streams, firefighters can project a large volume of water over rooftops or other obstacles, effectively suppressing fires that pose a significant challenge.

While the capability to deliver water for firefighting is certainly a function of such systems, the unique design feature of elevating water towers specifically targets the need for height in water delivery, making option C the best choice. Similarly, supporting the aerial apparatus and monitoring water quality, while important components of firefighting operations and infrastructure, do not encapsulate the primary function of elevating water towers as directly tied to the effective deployment of water streams during firefighting efforts.