Difference between revisions of "Permeameters"

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[[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]]
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[[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.  
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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.  
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Sampling strategies for their use is found on [[Design infiltration rate]]
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Sampling strategies for their use is found on [[Design infiltration rate]].
  
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==Measurements==  
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==Using a permeameter==  
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{{float right|{{#widget:YouTube|id=0hkRTrm5uxs}}}}
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{{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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===Filling the permeameter===
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[[File:Infiltration_Testing_1.jpeg|thumb|Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario]]
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#Check that the three-part inner tube is firmly pressed down to its fullest extent, and that the indicator is at the bottom of the indicator scale on the top of the reservoir.
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#The permeameter must be secure and upright for filling. One way to achieve this is to place the permeameter into the well and stabilize by nesting the bushing into the tripod.
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==Guelph Permeameter Field Sheets==
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#*The disadvantage is that the permeameter must not jostle within the well and care must be taken not to pour water down the outside of the permeameter into the hole directly.
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Click below to download and print the Guelph Permeameter field sheet to be used to test your site(s)' infiltration rate
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#*The advantage is that the top of the reservoir can be easily seen and accessed.
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#At the base of the reservoir there is a knob with a notch in the side. Turn the know so that the notch is at 12 o’clock. This connects the inner and outer chamber within the reservoir.
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{{Clickable button|[[Media:Guelph Permeameter field sheet.xlsx|Download the Guelph Permeameter Field Sheet]]}}
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#On the top of the reservoir open the short hose and remove the rubber plug.
 
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#Water can then be poured into the reservoir using the recessed area in the top.  
 
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#When the reservoir appears full, tap the sides gently to dislodge any air bubbles, close off the hose and ensuring that a small excess of water is contained within the recess, replace the plug.
 
  
 
==External links==
 
==External links==
 
{{:disclaimer}}
 
{{:disclaimer}}
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*[http://www.sewagesolutions.ca/permeameters.htm the CSSi Permeameter]
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*[http://www.hoskin.ca/catalog/index.php?main_page=product_info&cPath=181_642_653&products_id=215 Guelph Permeameter]
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*[http://www.engtech.ca/products/pask-permeameter/ the ETC Pask Permeameter]
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*[http://www.engtech.ca/products/pask-permeameter/ ETC Pask Permeameter]
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*[http://www.hoskin.ca/catalog/index.php?main_page=product_info&cPath=181_642_653&products_id=215 the Guelph Permeameter]
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*[https://www.sewagesolutions.com/permeameters/ CSSi Permeameter]

Latest revision as of 19:29, 25 October 2022

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.

Principle[edit]

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 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. Sampling strategies for their use is found on Design infiltration rate.

Using a permeameter[edit]

Packing list[edit]

  • Permeameter
  • Auger kit
  • Water container (will water need transporting to the test site?)
  • Laptop with spreadsheet or field forms
  • Onsite repair kit:
    • Strong adhesive tape
    • Knife
    • Hose clamps
    • Screwdriver
    • Vacuum grease
  • Logistics:
    • Tarpaulin to kneel/work on
    • Seat?
    • Sunscreen and/or umbrella?
Permeameter.png

Permeameter assembly (Guelph permeameter)[edit]

There are three thin inner tubes (shown in dark red):

  • the central tube is the longest and sits within the reservoir assembly,
  • the bottommost tube has a washer/seal apparatus on the end which does not attach to the central tube,
  • the top tube is the shortest and has an open end where it does not attach to the central tube.

The reservoir assembly comprises two tubes of the same length:

  • the outer (shown in green) is unmarked,
  • and there is a mid-sized tube with graduations in millimeters,

There are two further mid-sized tubes (in orange):

  • the longer of these has a cup-shaped, filter-like ‘foot’ and should have a funnel shaped bushing threaded on (shown semi-transparent); this tube goes onto the base of the reservoir,
  • the shorter tube has graduations in millimeters and no other components attached; it slides onto the very top around the shortest thin tube.

At the top of the reservoir section there are three small but important components to note:

  • a short flexible hose to regulate air going into the reservoir; this should have a plastic ring associated to close it off,
  • a hole with a rubber plug; this is used to fill the reservoir with water (not shown),
  • a moveable ‘indicator’ on the inner tube; it is a small cylinder of plastic threaded onto the tube which come directly from the reservoir.

The order in which the parts are assembled will be dictated by which connectors can fit through which holes within the connecting plates. It is easiest to connect up the thinnest tubes first. Find a clear flat piece of ground (or a picnic table) and assemble all of the parts horizontally to reduce strain on the connectors.

Infiltration testing with a Guelph Permeameter at a site in Glen Williams, Ontario

Guelph Permeameter Field Sheets[edit]

Click below to download and print the Guelph Permeameter field sheet to be used to test your site(s)' infiltration rate

Download the Guelph Permeameter Field Sheet

External links[edit]

In our effort to make this guide as functional as possible, we have decided to include proprietary systems and links to manufacturers websites.
Inclusion of such links does not constitute endorsement by the Sustainable Technologies Evaluation Program.
Lists are ordered alphabetically; link updates are welcomed using the form below.

The rate at which stormwater percolates into the subsoil measured in inches per hour.

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