| Error | Consequence | Prevention | |-------|-------------|------------| | | Overestimates infiltration | Ensure outer ring water level equals inner ring level at all times. | | Ring driving smearing | Reduces vertical permeability | Drive rings smoothly, avoid over-hammering. Use sharpened ring edges. | | Temperature variation | Changes water viscosity | Record water temp; apply viscosity correction (provided in the standard). | | Trapped air | Hinders infiltration | Pre-saturate surface or use de-aired water. | | Insufficient test duration | Reads transient, not steady-state rate | Continue until rate stabilizes (can take hours in clays). |
The standard provides the field procedure for measuring the infiltration rate of soils using a double-ring infiltrometer . This method is primarily used for fine-grained soils to assess drainage for irrigation, waste disposal, or reservoir leakage. Core Test Principles astm d338518 pdf
Summary
The ASTM D3385-18 PDF report provides a detailed methodology for conducting infiltration tests using a double-ring infiltrometer. The test method involves driving two concentric rings into the soil surface, with the inner ring serving as the test area and the outer ring acting as a buffer zone to minimize lateral flow. | | Temperature variation | Changes water viscosity
Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer1 | The standard provides the field procedure for
The foundational mechanics rely on separating vertical and horizontal flow vectors. When water is introduced to a single ring driven into the ground, lateral capillary forces cause the liquid to diverge outward, artificially inflating the calculated vertical velocity.
Understanding the limitations of ASTM D3385-18 is critical for proper application: