If the inner ring water level drops 1.5 cm over 10 minutes:

The evaluation of BR properties is crucial for:

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 .