What does averaging perc test rates across a site not allow for?

Averaging perc test rates across a site does not allow for the identification of site variability because it masks the differences in the absorption rates of different areas within the site. Each location may have unique soil characteristics, moisture levels, or compaction, which can significantly influence the permeability rates. By averaging, you lose critical information regarding how each specific area performs, which is essential for understanding the overall site conditions. This lack of differentiation can lead to a misunderstanding of the land's capabilities for drainage and septic system effectiveness. Understanding site variability is crucial for making informed decisions about system design and ensuring that it meets the specific needs based on localized soil behavior.