) is calculated using the volume of water consumed by the inner ring over a precise time increment:
Serves as the actual measurement zone. Because lateral flow is mitigated by the outer ring, the drop in water level (or volume added) in the inner ring accurately reflects true vertical infiltration. Technical Specifications and Equipment astm d338518 pdf
: Water is maintained at a fixed level in both the inner and outer rings. ) is calculated using the volume of water
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