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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]]
[[File:Double ring.JPG|thumb|Double ring]]
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==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==
===Packing list===
===Packing list===
* Small ring (28 – 32 cm)
* Small ring (28 – 32 cm)
* Wooden block to distribute force when driving rings into ground
* Wooden block to distribute force when driving rings into ground
* Level
* Level
* Two metal rulers with clips to secure
* Two metal rulers with clips or tape to secure
* Container for water (will water need transporting to site? take more than you think you'll need)
* Container for water (will water need transporting to site? take more than you think you'll need)
* Screwdriver or similar implement to dislodge rocks
* Screwdriver or similar implement to dislodge rocks
==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.