: The volume of liquid added to the inner ring to maintain a constant water level over time.
ASTM D3385-18 allows for two primary measurement methodologies: Method A: Constant Head Test (Preferred)
For tighter soils, intervals can be extended to every 30 to 60 minutes.
Soils with hydraulic conductivities less than
The ASTM D3385-18 pdf standard does not cover all safety issues related to its use; it is the user’s responsibility to follow proper safety protocols. Where to Obtain the ASTM D3385-18 PDF astm d338518 pdf
Evaluating potential septic-tank disposal fields and liquid waste disposal sites.
For highly permeable soils, intervals might be every 5 to 10 minutes.
Guide to ASTM D3385-18: Standard Test Method for Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer
: It provides definitions relevant to the standard, including terms like "apparent opening size" and "pore size distribution." : The volume of liquid added to the
Typically an open cylinder that is at least 300 mm (approx. 12 in.) in diameter and at least 500 mm (approx. 20 in.) long.
Data interpretation and reporting
Select a flat, undisturbed area. Gently clear away loose surface debris, heavy vegetation, and thatch. Avoid excavating or scraping deeply, as this alters the natural bulk density and structural porosity of the topsoil layer. Step 2: Driving the Rings
Acts as a buffer, ensuring the water in the inner ring moves vertically downwards rather than spreading horizontally. Where to Obtain the ASTM D3385-18 PDF Evaluating
Test principle and equipment
: The standard becomes unreliable in highly pervious or highly impervious zones. It is limited to soils with a hydraulic conductivity ranging between . For tighter soils (
The standard is the globally recognized benchmark for measuring the in-situ infiltration rate of liquids into soil . Managed by the ASTM Committee D18 on Soil and Rock , this specification establishes a uniform field protocol using a double-ring infiltrometer to capture accurate drainage properties. These measurements are critical for engineering civil infrastructure, stormwater management frameworks, and environmental containment designs.
Indicates the standard was approved or last revised in 2018.