Which of the following is NOT a type of water tank?

The concept of water tanks encompasses various designs utilized for the storage and distribution of water; each type serves specific purposes and is characterized by unique structural features. Among the options provided, the term "Cylinder Tank" does not represent a recognized category of water tanks.

Legged tanks, pedestal tanks, and standpipe tanks are all established types of water storage solutions. Legged tanks are elevated on legs, providing gravity-fed water pressure. Pedestal tanks are similar in that they are raised, often utilized for providing water pressure in distribution systems. Standpipe tanks typically consist of a vertical cylindrical structure used for maintaining water supply levels and pressures.

While the "Cylinder Tank" may describe a certain shape, it lacks the formal classification or specific design concepts associated with water tank types recognized in engineering and water management practices. Thus, identifying "Cylinder Tank" as not being a type underscores the understanding of the naming conventions and classifications within the water storage domain.