The foundational mechanics rely on separating vertical and horizontal flow vectors. When water is introduced to a single ring driven into the ground, lateral capillary forces cause the liquid to diverge outward, artificially inflating the calculated vertical velocity.

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: A typical setup uses a 12-inch (30 cm) inner ring and a 24-inch (60 cm) outer ring. Scope and Applicability

Users searching for this standard often use variations including:

The solves this problem by using two concentric rings:

You should rely solely on this standard in several scenarios:

ASTM D3385-18 represents the authoritative method for field measurement of soil infiltration rates using double-ring infiltrometers. The official PDF is available for purchase from ASTM International and authorized distributors. Users should always obtain the standard from official sources to ensure compliance with copyright law and to guarantee they have access to the complete, current version.

To comply with ASTM D3385-18, specific equipment dimensions and materials must be used. 1. The Rings