THE DIAMETER OF THE OUTSIDE OF THE PIPE TIMES PI TIMES THE LENGTH OF THE PIPE or D x Pi x L = A
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to find the velocity of water in a pipe use the equation Q = VA where Q = the total volume of water running through the pipe in cubic feet per second V = the velocity of the water A = the cross sectional area of the pipe. (remember area = r^2*pi or D^2/4*pi). If you have the radius in inches find the area in inches and divide by 144 (1 square foot) this will yield the area in ft^2. you need to know how much water is running through the pipe (Q) - say 5 cfs and the area of the pipe (A) - say 1 ft^2 rearrange the previous equation V = Q/A and you get V = 5cfs/ 1 ft^2 = 5 fps