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Drainage & Piped Services Standard Specification
Version 2014-1

Precast Concrete Silt Trap and Flow Control Chamber System for Below Ground Drainage

System Performance: Design of access chambers for below ground drainage type The chamber is to be
suitably sized and accessible to be used a sampling point.

System manufacturer: Milton Pipes Ltd or equal and approved

Base slabs: Precast concrete manholes – base units type A.

Shafts:

Precast concrete sections: Precast concrete manholes – chamber sections type A.

Jointing and sealing: Manufacturers sealed rubber joints

Benchings and toppings:

Benching: Designated concretes for drainage applications type M.

Topping: Wearing screed

Flow control:

Devices: Orifice plate flow control units type B and Vortex flow control units type B.

Secondary outlet valves: Submit proposals.

Access components: Access chamber ladders type A.

Covers:

Cover slabs: Precast concrete manholes and soakaways – cover slabs type A.

Seating: Precast concrete access cover seatings type C.

Covers and frames: Access covers and frames type D.

Surround: Designated concretes for drainage applications type N.

Backfill: Submit proposals.

Execution: Installing precast concrete shallow access chambers for below ground drainage type A; Installing
vortex flow control units in access chambers for below ground drainage type B; Fixing steps in below
ground drainage monitoring and control systems type C; Jointing precast concrete below ground drainage
access chamber sections type A; Installing access covers and frames to chambers for below ground
drainage type F;
and Installing precast concrete access chambers and shafts for below ground drainage type A.
System Completion: Removal of debris and cleaning below ground drainage monitoring and control
systems type E; Water testing of manholes and inspection chambers for below ground drainage monitoring
and control systems type E; Testing of ancillary components in below ground drainage monitoring and
control systems type E; and Documentation type E.

System Performance

Design of access chambers for below ground drainage type The chamber is to be suitably sized and
accessible to be used a sampling point
Design: Complete the design of the access chamber system.
Standards: To BS EN 752 and in accordance with National Annex NA.

Products

Precast concrete manholes – base units type A
Manufacturer: Milton Pipes Ltd or equal and approved

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