Question $2$

Water at $15C$ is flowing through a $300-mm-$diameter welded$-$steel pipe $)=(0\mathrm{.}046mm$ long that drains a reservoir under a head of $50m.$ The speed of the water in the pipe under these conditions is $3\mathrm{.}07\frac{m}{s}.$ The pipe wall has a thickness of $8\mathrm{.}5mm.$

a$)$ If a valve at the end of the pipe is completely closed in $10s,$ approximately what waterhammer pressure will be developed?

b$)$ If the steady$-$state flow is instantaneously reduced to one$-$half its original value, what waterhammer pressure rronld vou expect?