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→Calculations
[[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]]
[[File:Bill's double ring.jpg|thumb|Double ring infiltrometer in use]]
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[[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 [[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.
##The saturated hydraulic conductivity (K) is approximated by dividing A by 2/3, where A is the slope of the linear part of the graph. i.e when infiltration rate has stabilized.
##The saturated hydraulic conductivity (K) is approximated by dividing A by 2/3, where A is the slope of the linear part of the graph. i.e when infiltration rate has stabilized.
==To review==
==External references==
https://www.astm.org/Standards/D3385.htm
* https://www.astm.org/Standards/D3385.htm an alternative method which uses Mariotte tubes to maintain a constant water level during testing.