A positive drainage slope away from a house foundation of 5% is equal to which of the following?

A 5% drainage slope means that for every 100 units of horizontal distance, there is a vertical drop of 5 units. This can be expressed as a ratio: a 5% slope translates to a drop of 5 inches for every 100 inches of run (which is equivalent to 10 feet).

To find the appropriate drop over the distance of 10 feet (120 inches) based on the 5% slope, you calculate:

[

\frac{5}{100} \times 120 = 6 \text{ inches}

]

Therefore, a positive drainage slope of 5% results in a 6-inch drop over 10 feet. This is essential for ensuring that water flows away from the foundation of a building, helping to prevent potential issues like flooding or moisture damage. The other options do not align with the calculation of a 5% slope, as they either represent different run distances or different drop amounts that do not accurately reflect a slope of 5%.