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A reservoir is a node with a fixed water level (hydraulic grade line), exactly like a tank. However, the elevation of the node is designated as the elevation of the free water surface; i.e. the node elevation and elevation of the water surface coincide. The pressure at such a node is zero. Although the program is not constrained so, it is easy to think of a reservoir as a water supply reservoir, and a tank as an elevated storage (distribution) tank. (For steady state analysis, there is no real mathematical difference between a tank and a reservoir. There is, however, a distinction in time simulation and tank size optimization, where reservoirs are regarded as infinitely large sources or sinks).