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The ASTM D3385-18 standard mandates the .

Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer1

is the recognized international standard for determining the infiltration rate of soils in the field using a double-ring infiltrometer . This method is essential for geotechnical and environmental engineering, providing data for septic tank design, irrigation planning, and groundwater recharge studies. Core Objectives of ASTM D3385-18

Usually 12 inches (300 mm) in diameter. This is where the measurement takes place.

Evaluating the suitability of sites for liquid waste or septic systems.