Changes

[[File:Double ring.jpg|thumb|Schematic diagram of double ring infiltrometer illustrating the infiltration of water both vertically, and laterally particularly from the outer ring.]]

[[File:Double ring.jpg|thumb|Schematic diagram of double ring infiltrometer illustrating the infiltration of water both vertically, and laterally particularly from the outer ring.]]

[[File:Bill's double ring.jpg|thumb|Double ring infiltrometer in use (Photo Source:  Bill Trenouth, 2009]]

[[File:Bill's double ring.jpg|thumb|Double ring infiltrometer in use (Photo Source:  Bill Trenouth, 2009)]]

[[File:Double ring.JPG|thumb|Double ring]]

[[File:Double ring.JPG|thumb|Double ring]]

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==External references==

==External references==

* https://www.astm.org/Standards/D3385.htm an alternative method which uses Mariotte tubes to maintain a constant water level during testing.

* See most recent version of ASTM D3385 for standard test method.<ref> ASTM International. 2018. ASTM D3385-18 Standard Test Method For Infiltration Rate of Soils in Field Using Double-Ring Infiltrometer.</ref> [https://www.astm.org/Standards/D3385.htm]