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Drainage & Piped Services Standard Specification
Version 2014-1

Below Ground Combined Gravity Drainage Pipeline System

System Performance: Design of below ground gravity drainage pipeline systems type B.
System manufacturer: Polypipe Terrain or equal and approved
Surface water collectors: Concrete one piece gullies;
Plastics one piece gullies;
Polypropylene one piece gullies;
Vitrified clay one piece gullies;
Polypropylene composite gullies;
Vitrified clay composite gullies;
Drainage channels with gratings;
Filtration drainage channels;
Silt buckets;
Vitrified clay silt traps;
and Concrete silt traps.
Pipelines:

Pipes, bends and junctions: PVC-U solid wall below ground drainage pipelines for flexible
jointing type A;
PVC-U solid wall below ground drainage pipelines for flexible jointing type B;
PVC-U structured wall below ground drainage pipelines for flexible jointing type A;
PVC-U structured wall below ground drainage pipelines for flexible jointing type B;
Vitrified clay plain wall below ground drainage pipelines for flexible jointing type A;
and Vitrified clay plain wall below ground drainage pipelines for flexible jointing type B.
Pipeline accessories: Plastics rodding eyes;
Vitrified clay rodding eyes;
Adaptors for above ground pipe connections to plastics drainage pipelines;
Saddle connectors to below ground drainage pipelines;
Flexible couplings between below ground drainage pipelines;
Rat barrier pipes;
and Warning marker tapes buried services.
Pipeline beddings and surrounds:
Pipe bedding and surround classes: To be confirmed following site investigation report
Pipe bedding and surround materials:

Blinding: Designated concretes for drainage applications type Q.
Lower bedding: Submit proposals.

System Performance

Design of below ground gravity drainage pipeline systems type B

Design: Complete the design of the below ground drainage system in accordance with BS EN 752, BS EN
1295-1 and BS EN 1610.
Assumed ground conditions:
Performance criteria:

Vehicle load capacity (minimum):
Permanent construction:
Temporary construction: Trench bridging as necessary to prevent construction traffic
damaging pipes after backfilling.

Stormwater run-off capacity:
Requirement: Submit proposals including detailed design drawings, technical information, calculations and
manufacturers’ literature.

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