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Drainage & Piped Services Standard Specification
Version 2014-1

Rainwater drainage gutter test
 Preparation: Temporarily block all outlets.
 Testing: Fill gutters to overflow level and after 5 minutes closely inspect for leakage.
 Records of tests: Submit.

Rainwater drainage system maintenance instructions type A
 Printed instructions: Submit at completion.
 Contents: Recommended procedures for maintenance of the rainwater installation, including full

details of recommended inspection, cleaning and repair procedures.

Rainwater drainage system pre-handover checks type A
 Construction rubbish, debris, swarf, temporary caps and fine dust which may enter the rainwater

system: Remove. Do not sweep or flush into the rainwater system.
 Access covers, rodding eyes, outlet gratings and the like: Secure complete with fixings.

Documentation type A
 Operating and maintenance instructions:
 Scope: Submit for the system giving optimum settings for controls.
 Product information: Include product description, date of purchase, performance characteristics,

application (suitability for use), method of operation and control, and cleaning and maintenance
requirements.
 Format: Paper copy.
 Number of copies: Two.
 Record drawings:
 Content: Location, size and route of drainage services and Location of outlets.
 Format: Electronic.
 Number of copies: Two
 Submittal date: At handover.

System Performance

Design of gravity rainwater drainage system type A
 Design: Complete the design of the rainwater drainage system.
 Standards: In accordance with E&W Building Regulations Approved Document H, H3, Section 1 and

To BS EN 12056-3, clauses 3–7, Annex A and National Annexes.
 Design parameters:

 Roof and gutter construction and finish:
 Design life of building: 50 years.
 Design rate category: Category 2 to BS EN 12056-3, NB.2.1 and Category 3 to BS EN 12056-
3, NB.2.1.
 Available capacity of existing below ground drainage (maximum):
 Requirement: Submit proposals including detailed design drawings, technical information,
calculations and manufacturers’ literature.

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