Line 1: |
Line 1: |
− | [[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.]] | | [[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]] |
| + | {{TOClimit|2}} |
| + | ==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) |
Line 8: |
Line 14: |
| * 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 |
Line 27: |
Line 33: |
| | | |
| ==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}} |
| | | |
− | Using the DRI (double ring infiltrometer) spreadsheet
| |
| ===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. |
Line 54: |
Line 61: |
| ##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. |