Resource Centre | Drain Resources
Blockages
Blockages occur in two ways. They are:
- Instantaneous; resulting from an event such as vandalism or an inappropriate item being discharged into the drainage system, and
- Build-up over time; resulting from constant build-up of undesirable material in the drainage system, eventually causing blockage.
Build-up can occur for many reasons:
- High concentrations of grease in waste water
- Improper/inadequate grease interceptor maintenance
- Improperly sized or installed grease interceptor
- Lack of grease interceptors (typical in residential)
- Use of chemicals or emulsifying agents that temporarily "liquefy" grease and allow it to re-solidify downstream
- High discharge concentrations of hair
- Insufficient/wrong slope in drain piping
- Improper drain piping connections, such as poor or cracked grouting in clay piping (caused by installation deficiencies or developments over time)
- Intrusion into the drainage system (such as roots)
- Porous or rusted drainage piping (i.e. cast iron, or clay - usually older)
- Use of food grinders or "pulpers"
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