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DRAINAGE SYSTEM - Coggle Diagram
DRAINAGE SYSTEM
3 DRAINAGE SYSTEM
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- Partially separate system
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- determined by the local water authority's established sewer arrangements.
- Use a single drain to convey both foul water from sanitary appliances
- rainwater from the roofs and other surfaces to a shared sewer.
- economical to install, but the processing costs at the sewage treatment plant are high.
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ii. Rain water from the roofs and other durfaces is conveyed in a surface water drain into a surface water sewer or a soakaway.
- Relatively expensive to install, particularly if the ground has poor drainage qualities and soakaway cannot be used.
- Benefit is reduced volume and treatment costs at the processing plant.
- PARTIALLY SEPARATE SYSTEM
- Most of teh rainwater is conveyed by the surface water drain into the surface water sewer.
- Convenience and reduce costs, the local water authority may permit an isolated rainwater inlet to be connected to the foul water drain.
- 2 sewer which are rainwater sewer and combined sewer.