What is a valid method to assess soil percolation when test results are unavailable?

• A. Recent rainfall
• B. Interpret soil texture and structure indicators and, if available, review percolation test results
• C. Groundwater depth only
• D. Plant species present

Answer: (B)

Assessing percolation without a formal test relies on how the soil handles water, which is controlled by texture and structure. Texture tells you the size of the soil's pores: sandy soils have larger pores and drain water quickly, while clayey soils have tiny pores and infiltrate slowly. Structure shows how those pores are arranged and connected; well-formed granular or crumbly structure with stable pore networks allows faster infiltration, whereas compacted or massive structures restrict movement of water. If any prior percolation test results exist, reviewing them helps anchor your judgment. Relying on recent rainfall or groundwater depth doesn’t provide a reliable, longer-term measure of infiltration capacity, and plant species alone doesn’t quantify how quickly soil water percolates.