Which type of tank is designed to convey water at a selected pressure range?

The correct answer is a hydro-pneumatic tank because it is specifically designed to maintain a constant pressure in a water supply system. These tanks use a combination of water and air pressure to regulate and stabilize the pressure of the water in the system, allowing for consistent flow and system performance. When water is drawn from the system, the tank releases the air pressure, pushing water out and helping to equalize pressure fluctuations that may occur during periods of high demand. This makes them particularly useful in applications where maintaining a specific pressure range is critical for the operation of pumps and other system components.

In contrast, ground-level storage tanks serve more for storage than pressure regulation; they rely on gravity for water distribution. Buried reservoirs, while also designed for storage, do not provide the pressure management features typical of hydro-pneumatic tanks. Elevated storage tanks are beneficial for water pressure generation due to their height, but they do not utilize the air-water interface mechanism that hydro-pneumatic tanks do to actively manage pressure levels in real-time.