5.3.6 Groundwater drainage
Groundwater drainage shall convey excess groundwater to a suitable outfall. Issues to be taken into account include:
- layout of pipes
- pipe construction.
5.3.6.1 Layout of pipes
Where groundwater drainage is required, depending on the site contours and ground conditions, it may be designed as:
- a natural system
- a herringbone system
- a grid system
- a fan-shaped system
- a moat system.
5.3.6.2 Pipe construction
Pipe perforations should be holes or slots to suit the nature of the ground.
Groundwater drain systems connected to foul, surface water or combined drains should discharge into the drain through a catchpit. Where suitable, groundwater drainage may discharge into a soakaway, preferably through a catchpit or into a watercourse.
Last updated: 2nd January 2025