Astm D338518 Pdf Work May 2026

ASTM D3385-18 outlines the field procedure for measuring soil infiltration rates using a double-ring infiltrometer to evaluate liquid penetration, particularly for engineering and environmental applications. This standard test method maintains a constant hydraulic head in concentric rings to measure one-dimensional vertical flow in relatively uniform, fine-grained soils. Purchase the official standard and obtain the PDF from ASTM International. 

Apparatus: Detailed descriptions of the equipment needed for the test are provided, including sieves, a mechanical sieve shaker, and balances. astm d338518 pdf

Restrictions: This test cannot be performed if the soil surface is below the groundwater table. For extremely low infiltration rates, experts often refer to ASTM D5093 (sealed inner ring method) instead. The Double-Ring Method: How It Works ASTM D3385-18 outlines the field procedure for measuring

: The standard requires two open cylinders, typically with diameters of 300 mm (inner) and 600 mm (outer) and a height of approximately 500 mm. Constant Head Method Apparatus : Detailed descriptions of the equipment needed

2.2 The Principle of Lateral Flow Containment

A primary challenge in field infiltration testing is the divergence of flow lines. In a single-ring infiltrometer, water infiltrates vertically but also spreads laterally due to capillary forces and the geometry of the wetting front. This lateral spreading artificially inflates the measured infiltration rate because the wetted area increases with depth.