A $12-$in$-$diameter pipe $(f=0\mathrm{.}028)450$ ft long runs from

one reservoir to another, both ends of the pipe being under

water $($Fig$.$ P$8\mathrm{.}60).$ The intake is square$-$edged. The

difference between the water surface levels of the two

reservoirs is $150$ ft$.$ Find $($a$)$ the flow rate, and $($b$)$ the

pressure in the pipe at a point $320$ ft from the intake, where

the elevation is $135$ ft lower than the surface of the water in

the upper reservoir.

Figure P$8\mathrm{.}60$