Question 584216
I have a tunnel 20ft. in diameter, it has the capacity to store 38 million gallons of water and delivering flow by gravity to an existing water treatment plant.
 How long is the tunnel
:
The volume of a cylinder: {{{V = pi*r^2*h}}}, radius is 10'
Find how many cubic ft in 38 million gallons. (7.481 gal in 1 cu/ft)
{{{38000000/7.481}}} = 5079535 
:
{{{pi*10^2*h}}} = 5079535
314.16h = 5079535
h = {{{5079535/314.16}}}
h = 16,169 ~ 16,170 ft long