A perc test is used to measure the what of soil?

A perc test, also known as a percolation test, is specifically designed to measure the absorption rate of soil. This test helps determine how quickly water will be absorbed into the ground, which is crucial for evaluating the suitability of the soil for a septic system or drainage field. The rate of absorption is vital because it affects the design and function of septic systems; if the soil absorbs water too quickly or too slowly, it could lead to malfunctioning systems or environmental contamination.

The perc test involves digging a hole in the soil and filling it with water. Observations are then made regarding how quickly the water level drops, providing essential data about the soil's capacity to absorb water. This absorption rate directly influences the design and capacity planning for on-site wastewater treatment systems, ensuring they function effectively without causing harm to the surrounding environment.

Understanding this concept is important for builders and developers, as it impacts decisions on site selection, septic system design, and compliance with local regulations. The other choices provided do not relate to the specific function of a perc test, as it does not measure soil strength, moisture content, or pH levels directly.