$\mathrm{.}1$A pipeline $2\mathrm{.}5$ km long $($L$)$ and $150$ mm diameter $($D$)$ supplies water from a reservoir to a small town storage tank. Calculate the discharge $($Q$)$ when the pipe outlet is freely discharging into the tank and the difference in level between the reservoir and the outlet is $15$ m$.$ Assume the frictionfactor f$=0\mathrm{.}04.$