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Line 48: − ===Preparing a well===+ − The Guelph Permeameter requires a smooth sided cylindrical hole containing water to function. This is prepared using a soil auger set. − #Firstly the well is dug to the approximate depth using a digging auger with pointed cutting bits. − #*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. − #*The well should be at least 30 cm deep from the surface. It may be much deeper depending on the apparatus available. − #The well should then be finished to more of a cylindrical shape using a sizing auger, − #Just one or two passes of a brush may be used to reduce any ‘sealing’ or ‘smearing’ of the walls of the well. − #Move any loosened soil from the edges of the hole to ensure that they do not fall in during testing. − #Assemble the tripod over the hole.
→Using a permeameter
[[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.]]
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==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.
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]].
==Measurements==
==Using a permeameter==
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===Packing list===
===Packing list===
*Permeameter
*Permeameter
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.
[[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]]
==External links==
==External links==