A pump storage facility takes water from a river at night when demand is low and pumps it to a hilltop

reservoir $500ft$ above the river. The water is returned through turbines in the daytime to help meet peak

demand. For two $30-$in pipes, each $2500ft$ long and carrying $20000ga\frac{l}{m}in,($a$)$ what is the velocity of

water? And $($b$)$ what pumping power is needed if the pump efficiency is $85$ percent? The friction loss is

estimated to be $15.(20$p$,$ a: $10$p$,$ b: $10$p$)$

Answer:

$($a$)$ :

$f\frac{t}{s}$

$($b$)$: $($

$ft*olb*1b$