Author: Brian Ashworth March 13, 2013

Thanks to SaveH2O, of Supadiverta

This diagram indicates a charged drainage system. These are sometimes called either a “wet” or a “pressure” system.

With this type of system a section of the pipe always remains full unlike a Conventional System.

As the pipes are under pressure it is essential all the joints in above ground and underground pipework are fully watertight

Advantages

• A neater appearance than having pipes above ground.
• Allows you to discharge water at a height above the ground level at the down pipe.

Disadvantages

• It is more likely to block as the flow through the pipes can be fairly slow and the low points can collect silt. Silt will get deposited at flow rates below 0.6m/sec which will be the situation for most rainfall events.
• It is also more difficult to unblock.
• Can cost more with excavation and additional inspection fittings .
• Potential for mosquito  breeding  in water unless appropriate screes are installed.

 

Also see Underground Pipes