: Used for evaluating liquid waste disposal sites, septic-tank fields, irrigation requirements, and potential leakage in canals or reservoirs. Scope and Soil Applicability
In the mid-20th century, civil and geotechnical engineers faced a quiet but critical problem: how to measure the rate at which water could move through soil on-site, without digging it up and bringing it to a lab. Soils behave differently when disturbed. A lab test on a remolded sample might miss the cracks, roots, or layers that actually control water flow in the ground. astm d338518 pdf