Difference between revisions of "Pipes"

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*Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material) with a minimum inside diameter of 100 mm.
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[[File:Perforations.png|thumb|Pipes are available with perforations on just one side, these should be situated on the lower half of the pipe. Pipes with 360° perforations should have a strip of geotextile or membrane placed over the pipe to reduce the migration of fines from overlying media.]]
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**Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.
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Perforated pipes are a common component of [[underdrains]], [[infiltration trenches]] and [[exfiltration trenches]].
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**Perforations should be 10 mm in diameter and distributed at least every 90 deg around the pipe.
 
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*All underdrains should be capped on the upstream end.
 
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*At least one vertical well per BMP is recommended, for inspection and monitoring water level.
 
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**Well(s), of 100 - 150 mm diameter perforated pipe, should extend to the bottom of the facility.  
 
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**Where a horizontal underdrain is being installed, an upstream and a downstream well should be coupled to the underdrain pipe. The pair of wells can then be used to flush out the length of underdrain if required.  
 
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**The exposed tops of all wells should be fitted with lockable caps.
 
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*Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
 
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**To function correctly, the capacity of the overflow pipes must be greater than the inlet(s).
 
  
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Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International.
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*Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material).
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**Wherever possible pipes should be ≥ 200 mm internal diameter to reduce clogging and to facilitate inspections and maintenance.
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**Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.   
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**A perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes <ref>Hazenberg, G., and U. S. Panu (1991), Theoretical analysis of flow rate into perforated drain tubes, Water Resour. Res., 27(7), 1411–1418, doi:10.1029/91WR00779.</ref>.
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*Non-perforated pipes should be used for conveyance to and away from the facility, including [[overflow]]. It is good practice to extend the non-perforated pipe approximately 300 mm within the reservoir or practice to reduce the chance of migration from native soils clogging the pipe at the interface.
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<gallery mode="packed" widths=200px heights=200px>
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Perforated Pipe 550x550.jpg|Pipe with slotted perforations
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Pipe with connector.jpg|Perforated pipes awaiting installation, note the 30 degree connector used to facilitate maintenance.
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</gallery>
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See also: [[flow through perforated pipe]]
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[[Category:Materials]]
 
[[Category:Materials]]

Revision as of 18:53, 15 March 2019

Pipes are available with perforations on just one side, these should be situated on the lower half of the pipe. Pipes with 360° perforations should have a strip of geotextile or membrane placed over the pipe to reduce the migration of fines from overlying media.

Perforated pipes are a common component of underdrains, infiltration trenches and exfiltration trenches.

Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International.

  • Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material).
    • Wherever possible pipes should be ≥ 200 mm internal diameter to reduce clogging and to facilitate inspections and maintenance.
    • Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.
    • A perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes [1].
  • Non-perforated pipes should be used for conveyance to and away from the facility, including overflow. It is good practice to extend the non-perforated pipe approximately 300 mm within the reservoir or practice to reduce the chance of migration from native soils clogging the pipe at the interface.

  • Pipe with slotted perforations

  • Perforated pipes awaiting installation, note the 30 degree connector used to facilitate maintenance.

See also: flow through perforated pipe

  1. ↑ Hazenberg, G., and U. S. Panu (1991), Theoretical analysis of flow rate into perforated drain tubes, Water Resour. Res., 27(7), 1411–1418, doi:10.1029/91WR00779.

Filter fabric that is installed to separate dissimilar soils and provide runoff filtration and contaminant removal benefits while maintaining a suitable rate of flow; may be used to prevent fine-textured soil from entering a coarse granular bed, or to prevent coarse granular from being compressed into underlying finer-textured soils.

Soil particles with a diameter less than 0.050 mm.

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