A site drain gradient of 2% corresponds to approximately how many inches per foot?

A site drain gradient of 2% indicates that for every 100 units of horizontal distance, the elevation changes by 2 units. To convert a percentage gradient to inches per foot, one can understand that 2% translates to a rise of 2 inches over a run of 100 inches (which is equivalent to 8.33 feet since there are 12 inches in a foot).

When converting this to a per-foot basis, you take the 2 inches of rise and consider it over 1 foot of horizontal run, as 1 foot equals 12 inches. Therefore, for 1 foot, the rise would be calculated as follows:

2 inches over 100 inches is 2/100 = 0.02.

To find how many inches that would mean in terms of feet, you can relate that calculation back to feet. Thus, the conversion of 2% per foot leads to a rise of approximately 1/4 of an inch per foot when you consider that 12 inches make up a foot; 0.02 foot equates to roughly 1/4 inch (since 0.25 feet equals 3 inches).

Therefore, amidst the conversion and ratios, the correct representation of a 2%