Difference between revisions of "Pipes"

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Pipes should have been manufactured in conformity with the latest standards by the Canadian Standards Association (CSA) or ASTM International.
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) with a minimum inside diameter of 100 mm.  
*Perforated pipes should be continuously perforated, smooth interior HDPE (or equivalent material) with a minimum inside diameter of 100 mm.
**Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.  
**Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.   
**Perforations should be made on all sides of the pipe and provide a ≥ 1 m<sup>2</sup> of open area per linear meter of pipe.
*Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.  
*All underdrains should be capped on the upstream end.
*Perforations should be made on all sides of the pipe and provide a ≥ 1 m<sup>2</sup> of open area per linear meter of pipe.
*At least one vertical well per BMP is recommended, for inspection and monitoring water level.
 
**Well(s), of 100 - 150 mm diameter perforated pipe, should extend to the bottom of the facility.
**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.
**The exposed tops of all wells should be fitted with lockable caps.
*Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
*Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
**To function correctly, the capacity of the overflow pipes must be greater than the inlet(s).
*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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[[Category:Materials]]
[[Category:Materials]]

Revision as of 23:26, 2 March 2018

Perforated Pipe 550x550.jpg
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.

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) with a minimum inside diameter of 100 mm.
    • Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.
  • Where freezing is a concern, horizontal underdrain pipes should be over-sized to a minimum 200 mm diameter.
  • Perforations should be made on all sides of the pipe and provide a ≥ 1 m2 of open area per linear meter of pipe.
  • Non-perforated pipes should be used for conveyance to and away from the facility, including overflow.
  • a perforated pipe with many rectangular slots has better drainage characteristics than a pipe with similar open area provided by fewer circular holes [1].
  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.

A perforated pipe used to assist the draining of soils.

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