To ensure your engineering calculations, geotechnical reports, or environmental assessments are legally compliant and technically accurate, you should utilize the official publication. You can purchase, view, or download the full directly from the official ASTM Store.

The standard emphasizes that while highly effective, the double-ring method is not universally applicable to all soil profiles. Ideal Soil Conditions

The test procedure outlined in the involves several distinct steps:

ASTM D3385-18, the "Standard Test Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer," outlines a field procedure using a 12-inch inner and 24-inch outer ring to determine soil permeability. The constant-head method is suitable for measuring liquid infiltration in various soils, excluding those with high gravel content or excessive shrinkage. The full standard can be purchased directly from the ASTM Store .

If you want, I can: provide a one‑page printable cheat sheet for performing a D3385 test in the field, or produce the sample calculation and an example infiltration‑vs‑time plot from realistic measurement data. Which would you prefer?