Point Drainage

Surface water clearance

• Intercept performance only at gullies

Installation

• Excavation may be required from a minimum of 1.0m to 5.0m at the outfall of large sites, disturbing lower sub-soil layers which may require additional ground engineering consultation. Large quantities of spoil resulting from excavation, with consequent Landfill Tax costs
• Large quantities of pea gravel required as bedding and backfill
• More pipework, manholes, gullies and rodding points required
• Excavation support required in deep trenches, planking, strutting and shoring
• Complex final falls required to ensure effective clearance of surface water, each creating a dish to drain to gully

Aesthetic appearance and environmental performance

• Less comfortable/harder work to walk, drive or push wheeled vehicles, trolleys or wheelchairs across

Channel Drainage

Surface water clearance

• High intercept performance across total length of channel run; reduced occurrence of ponding or streaming across site; higher capacity than similar diameter pipes

Installation

• More concrete needed for bed and hauching
• No pea gravel required as bedding and backfill
• Excavation is seldom more than 500mm below the finished paving level. If the reduced formation level of the site is 500mm or lower, extra excavation may be needed
• Minimal interference with existing services due to shallow excavation
• Minimal spoil to cart away (Landfill Tax)
• Easy to achieve required levels / falls through following correct installation procedures
• No planking or strutting