What test is performed to determine the drainage capacity of a soil?

The percolation test is used to determine the drainage capacity of soil by measuring the rate at which water moves through the soil. This is critical information when designing septic systems or drainage solutions, as it helps to assess how well the soil can absorb and drain water.

During the test, holes are dug in the soil, and water is added to observe how quickly it drains. The results indicate the soil's ability to manage water, helping engineers and contractors make informed decisions regarding construction and land use.

While the compaction test evaluates how well soil particles are packed together, and the soil absorption test measures how quickly a specific type of soil absorbs water, neither focuses primarily on drainage capacity in the same comprehensive manner as the percolation test. The drainage efficiency test, while relevant, is not a standard term commonly used in soil testing like the percolation test is, making the latter the most accurate choice for determining drainage capacity.