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→External references
[[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:Double ring.JPG|thumb|Double ring]]
[[File:Double ring.JPG|thumb|Double ring]]
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==Principle==
==Principle==
Using a double ring infiltrometer is a relatively simple (although slow) method of measuring soil the hydraulic conductivity or ''[[design infiltration rate]]'' of a given [[Soil groups|soil]].
==Measurements==
==Measurements==
==Calculations==
==Calculations==
Download a copy of our DRI (double ring infiltrometer) spreadsheet for this process. Directions are provided below.
{{#l:DRI.xlsx|Double ring to K}}
===The Solver add-in===
===The Solver add-in===
To use the calculation spreadsheet, an additional add-in must be enabled in your Excel program.
To use the calculation spreadsheet, an additional add-in must be enabled in your Excel program.
==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]