Astm D338518 Pdf [patched] Now

Two large reservoirs or carboys capable of maintaining a constant water level (head) inside both rings.

A single-ring infiltrometer often overestimates infiltration rates because water diverges laterally (sideways) once it passes the bottom edge of the ring. The double-ring design solves this issue:

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

= Time duration of the specific measurement interval (hours). Temperature Correction

The solves this problem by using two concentric rings: Two large reservoirs or carboys capable of maintaining

: It is best suited for relatively uniform fine-grained soils. It may be unreliable in very pervious soils (hydraulic conductivity is greater than 10 to the negative 2 power cm/s) or very impervious soils ( ASTM International Operational Requirements Astm D3385-18 | PDF | Liquids | Soil - Scribd

The volume of water added to the to maintain that constant head is recorded at specific time intervals (e.g., every 5, 10, 15, or 30 minutes). Soils behave differently when disturbed

Understanding ASTM D3385-18: The Standard Test Method for Infiltration Rate of Soils Using Double-Ring Infiltrometer

ASTM D3385-18 establishes a standard field procedure for measuring soil infiltration rates using a double-ring infiltrometer, essential for engineering applications like waste disposal and stormwater management. It is best suited for uniform, fine-grained soils where a constant head of liquid is maintained to measure downward vertical flow. For complete technical specifications, visit ASTM International .