A tank element in HAMMER CONNECT is modeled as a bottom feed tank. Some tanks, however, are fed from the top, which is different hydraulically and should be modeled as such.

To model a top feed tank, start by placing a pressure sustaining valve (PSV) at the end of the tank inlet pipe. Set the elevation of the PSV to the elevation of the inlet to the tank. The pressure setting of the PSV should be set to zero to simulate the pressure at the outfall of the pipe.

Next, connect the downstream end of the PSV to the tank with a short, smooth, large diameter pipe. The pipe must have these properties so that the headloss through it will be minimal.

The tank attributes can be entered normally using the actual diameter and water elevations.

The outlet of the tank can then proceed to the distribution system.