Head loss by pipe friction

I have discussed with my friend about the head loss issue. Assume you have a water tank with full water inside (height = H). Then, connect a pipeline (with length = L) at the side of tank (at bottom level). This connecting pipe has no slope (0%). Once, when we open the valve, the flow start. I know that flow velocity will be varied with the distance from starting point (say, x) and time (t).

So, if we can say V is function of flow distance and time or V(x,t).

The pipe friction loss formula = (fL/D)(V^{2}/2g)

In this case, can we say there will be a distance L that the flow can stop due to the balance between the pressure head (tank) and total head loss in the pipeline.Please advise. Thank you.

Sorry if my English is not clear.

Re: Head loss by pipe friction

I am met37818's friend whom he discussed with, I would like to clarify more detail that the water tank is not closed roof. It is open roof or let say it is the water reservoir.

The quantity of water is more than enough, then the water level may assume constant through time. Then we wonder the certain distance of pipe length is the water full flow within the pipe can be determined by head loss. Beyond that length the water flow may change to open channel type. Finally the water flow can not overcome the friction of inner skin of the pipe. Water stop flowing at certain distance, if we can determined.

Hope we can have a clue. Thanks a lot.

Akus