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| + | [[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]] |
− | [[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.]]
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− | [[File:Bill's double ring.jpg|thumb|Double ring infiltrometer in use]]
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− | {TOClimit|2} | |
| ==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]]. |
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| ==Measurements== | | ==Measurements== |
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| ==Calculations== | | ==Calculations== |
− | [[File:DRI.xlsx]]
| + | Download a copy of our DRI (double ring infiltrometer) spreadsheet for this process. Directions are provided below. |
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| + | {{#l:DRI.xlsx|Double ring to K}} |
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− | Using the DRI (double ring infiltrometer) spreadsheet:
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| ===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. |
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| ##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. |
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− | ==To review== | + | ==External references== |
− | https://www.astm.org/Standards/D3385.htm | + | * 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] |