Changes

[[File:Mariotte Guelph.jpg|thumb]]

[[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 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.  

==Using a permeameter==  

==Using a permeameter==  

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===Packing list===

===Packing list===

*Permeameter

*Permeameter