Changes

**Wherever possible, pipes should be ≥ 200 mm internal diameter.  

**Wherever possible, pipes should be ≥ 200 mm internal diameter.  

**Smooth interior facilitates inspection and maintenance activities; internal corrugations can cause cameras or hydrojetting apparatus to become snagged.     

**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 <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>.

**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>.

*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]]. 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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