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Looking at this question :

Point C head loss is 0 according to the author Bottom right Can’t understand why , any good explanation for this claim ?

Look at page 33 at the top enter image description here

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  • $\begingroup$ The only way for that to happen is : 0 velocity at the top submerged pipe zero pressure At the top submerged pipe $\endgroup$ – Mather Apr 16 at 10:05
  • $\begingroup$ are you sure they mean the area of the outlet of pipe ( C' ) or maybe it's about the reservoir ( C )in general? $\endgroup$ – SF. Apr 16 at 11:46
  • $\begingroup$ C in general because C’ is for another question relating to sudden cut of the pipe $\endgroup$ – Mather Apr 17 at 8:08
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The symbol $H_{\mathsf{C}}$ here doesn't represent a head loss, it represents an "absolute" head at point $\mathsf{C}$. Assuming that the fluid velocity in the region vertically above $\mathsf{C}$ is negligible, so that the pressure variation in that region is hydrostatic, that absolute head is equal to the vertical co-ordinate of the free surface above $\mathsf{C}$. The origin of co-ordinates is defined to be on that free surface, so the absolute head at $\mathsf{C}$ is zero.

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