Example

A pipeline

is $15cm$ in diameter and it is

at an elevation of $100m$ at section

A$.$ At section $B$ it is at an elevation

of $107m$ and has diameter of $30$

$cm.$ When a discharge of $50$ lit. $\frac{?}{s}$ of

water is passed through this

pipeline, pressure at $A$ is $3\mathrm{.}5$kPa.

Calculate pressure at $B$ if

flow is from $A$ to $B.$