Quick Answer
For cistern overflow pipes, a preferred material is PVC (polyvinyl chloride), due to its durability, resistance to corrosion, and affordability. PVC pipes are also relatively easy to install and can withstand the water pressure in a cistern system. This makes them a popular choice for cistern overflow pipes.
Material Selection Criteria
When selecting a material for cistern overflow pipes, durability is a top priority. PVC pipes are resistant to chemicals and corrosion, making them suitable for underground applications. They also withstand the pressure of water flowing through the pipe, and are less prone to damage from roots or animal burrows.
Pipe Sizing and Installation
Proper pipe sizing is crucial to prevent clogging and ensure efficient water flow. A general rule of thumb is to use a pipe diameter of at least 1.5 inches for residential cistern systems. When installing the pipe, slope it at a minimum of 1/4 inch per foot to ensure gravity-driven flow and prevent back-siphoning. It’s also essential to use a backflow prevention device to prevent contaminated water from entering the cistern.
Pipe Connection and Support
Connecting the PVC pipe to the cistern and overflow discharge requires secure and watertight connections. Use a minimum of two 1/2-inch J-bends to create a smooth transition between the pipe and the cistern outlet. For buried cisterns, use a support system such as a PVC pipe bracket or a concrete anchor to secure the pipe and prevent sagging or damage.
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