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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.]]
| + | {{TOClimit|2}} |
− | [[File:Bill's double ring.jpg|thumb|Double ring infiltrometer in use]] | + | ==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== |
| ===Packing list=== | | ===Packing list=== |
− | • Small ring (28 – 32 cm)
| + | * Small ring (28 – 32 cm) |
− | • Large ring (53 – 57 cm)
| + | * Large ring (53 – 57 cm) |
− | • Sledge hammer for driving rings into ground
| + | * Sledge hammer for driving rings into ground |
− | • 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
| + | * 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 |
| + | ** Tarpaulin for working/sitting on? |
| + | ** Sunscreen and/or umbrella! |
| ===Installation=== | | ===Installation=== |
| # Choose or create clear, level ground at the desired test location. | | # Choose or create clear, level ground at the desired test location. |
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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. |
| + | |
| + | {{#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] |