Water flows from a storage tank through a horizontal, $15$ cm diameter pipe $($cast

iron$)$ and discharges water $(20C)$ into the atmosphere at the end. The pipe is $80$ m

long, contains $30$ cm $-$radius bend $(60$ m from the pipe inlet$)$ and a fully open gate

valve $(120$ m from the pipe inlet$),$ and the entrance is square edged. Calculate the

flow rate if the depth of water in the storage tank is $21$ m above the inlet of the pipe.

Sketch the HGL and the EGL.