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Drainage Layout

Basic Pipe Drainage Systems - Introduction
Pipe drainage systems are usually based on one of four main designs. Herringbone and Grid systems are the commonest, however, Fan and Natural systems also have a place within certain circumstances.
This system provides for a main central pipe, which runs down a slope, that has lateral pipes connecting to it at acute angles.
This type of design is typically used on areas that are irregular in shape and will include golf greens and large general amenity playing fields.
An advantage of a herringbone design is that less depth is needed for excavated drains to achieve the necessary falls.
However, the disadvantages are that the designs are more complicated and expensive to install than the Grid system. In addition if the pipe system is later upgraded with sand-gravel slits, then there will be a variable slit length before the slit discharges its water because of the angled layout of the herringbone design.
Grid (also called Gridiron or Parallel)
This system has a main pipe, or pipes, at the perimeter of an area with laterals joining the main pipe either at right angles or an acute angle.
The main pipe will either run along or near to the line of the fall of the land.
The lateral pipes will typically cross the fall of the land in a diagonal fashion.