Drainage
An important part of the plumbing system is drainage, whereby waste or used water is encouraged to flow through a waste, or drainage pipe to a waste treatment location.The drainage system can only function properly when it has sufficient capacity and pitch, with tightly sealed joints, and proper venting which will eliminate air or gas pressure build up in the pipes causing unpleasant odours.
A proper drainage system employs gravity to draw waste water away. The drainage pipes need to be wide enough in diameter and smooth enough from the inside to allow the free flow of liquid and solid waste through it without catching while preventing the accumulation of waste at any point in the system.
Drainage Lines and Fixtures
Drainage lines must be pitched towards the sewer. The regulation for the proper installation of plumbing is covered in the building codes which is the jurisdiction of each municipality.
Septic Systems
Septic tank systems are the best individual sewage systems, used where city sewage systems likely unavailable.
Cleanouts
To prevent and maintain drainage systems which can become clogged, a plumbing drainage system uses access points known as clean out plugs whereby the system is accessible to clean out a clog or blockage. Typically some form of "snake" or wire device is used to perform the clean out function. Plumbing stoppages occur due to an accumulation of hair, grease or foreign objects or substances which become caught in a drainage line causing a blockage.
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