Question

the standard slope for a drainage pope carrying water is 1/4 inch of vertical drop per foot of horizontal distance. How many inches of vertical drop would an 18-ft drainage pipe require?

Answer 1

Given:

The length of the drainage pipe, l=18 ft.

The slope of the drainage pope is 1/4 inch of vertical drop per foot of horizontal distance.

Hence, the slope is m=1/4 in/ft.

Now, the vertical drop can be calculated by multipying the slope 1/4 in/ft by the length of pipe.

Thus, the vertical drop needed for a 18 ft pipe is,

$\begin{gathered} x=m\times l \\ =\frac{1}{4}\frac{in}{ft}\times18\text{ ft} \\ =4.5\text{ in} \end{gathered}$

Therefore, the vertical drop needed for a 18 ft pipe is 4.5 in.