PPD Practice Exam - Area Drain vs Perforated Piping

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Carmen Chee

May 19, 2024 16:26

Hi all, looking on some further explanation on why perforated piping is the correct choice opposed to an area drain? Is it because a perforated pipe would collect more water over a larger area? 

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  Juan Andres Espinoza Onofre May 24, 2024 20:12

  The area drain is usually connected to a stormwater pipe, this will require some excavation and possible regrading to direct water to the drain; however, the subsurface perforated piping is not necessarily going to the stormwater system and instead it is just preventing ponding by forcing a quicker flow into the subsoil. 

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  Jackson Wall May 30, 2024 19:46

  Another thought here is that an area drain will have a grate, which could be problematic for children running around on a playground.  In this instance, the subservice pipe carries water while not causing any tripping hazards

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  Eugene O'Callaghan May 30, 2024 19:58

  The question says "open grass area" - an area drain is for surface runoff so it requires a non-permeable surface pitched towards the grate inlet.

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