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− | [[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]] | + | [[File:Mariotte Guelph.jpg|thumb|The water level within the well is determined by the height of the air tube within the permeameter, only when bubbles pass can the water drop from the reservoir above.]] |
| {{TOClimit|2}} | | {{TOClimit|2}} |
| ==Principle== | | ==Principle== |
| A variety of field permeameters have been developed locally, and are readily available to purchase or to hire. | | A variety of field permeameters have been developed locally, and are readily available to purchase or to hire. |
| + | They speed up analysis (somewhat) and add some degree of accuracy to a simple [[percolation test]] by employing the [https://en.wikipedia.org/wiki/Mariotte%27s_bottle Mariotte bottle] principle to maintain a steady water level (fixed head condition) within the test well. |
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| They have relative benefits and limitations in their use, and as they are proprietary devices, they each have manufacturers specific recommendations for their use. | | They have relative benefits and limitations in their use, and as they are proprietary devices, they each have manufacturers specific recommendations for their use. |
− | Sampling strategies for their use is found on [[Design infiltration rate]] | + | Sampling strategies for their use is found on [[Design infiltration rate]]. |
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− | ==Measurements== | + | ==Using a permeameter== |
− | {{float right|{{#widget:YouTube|id=0hkRTrm5uxs}}}} | + | {{float right|{{#widget:YouTube|id=ugfUg4TeagU}}}} |
| ===Packing list=== | | ===Packing list=== |
| *Permeameter | | *Permeameter |
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| Find a clear flat piece of ground (or a picnic table) and assemble all of the parts horizontally to reduce strain on the connectors. | | Find a clear flat piece of ground (or a picnic table) and assemble all of the parts horizontally to reduce strain on the connectors. |
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− | ===Preparing a well===
| + | [[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]] |
− | The Guelph Permeameter requires a smooth sided cylindrical hole containing water to function. This is prepared using a soil auger set.
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− | #Firstly the well is dug to the approximate depth using a digging auger with pointed cutting bits.
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− | **Digging will require some pressure, but should not require heavy pressure which may adversely affect the soil beneath. If a rock or other feature is encountered that requires significant effort, the hole should be abandoned and a new boring begun nearby.
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− | **The well should be at least 30 cm deep from the surface. It may be much deeper depending on the apparatus available.
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− | #The well should then be finished to more of a cylindrical shape using a sizing auger,
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− | #Just one or two passes of a brush may be used to reduce any ‘sealing’ or ‘smearing’ of the walls of the well.
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| ==External links== | | ==External links== |