BS EN 12056-3:2000

Foreword
1 Scope
2 Normative references
3 Definitions and symbols
  3.1 Definitions
  3.2 Symbols
4 Runoff calculations
  4.1 Quantity of rainwater runoff
  4.2 Rainfall intensity, r
  4.3 Effective roof area, A
5 Hydraulic design
  5.1 Eaves gutters
  5.2 Valley and parapet gutters
  5.3 Gutter outlets
  5.4 Flat roof outlets
6 Rainwater pipes
  6.1 Part filled (non-siphonic systems)
  6.2 Siphonic systems
  6.3 Drains
  6.4 Connection to sanitary pipework
7 Layout
  7.1 General
  7.2 Gutters
  7.3 Outlets
  7.4 Emergency outlets
  7.5 Access
  7.6 Pipework
  7.7 Trace heating
  7.8 Change of building use
ANNEX A (NORMATIVE) TESTING OF GUTTERS AND OUTLETS
      A.1 Capacity of gutter and outlet in combination
      A.2 Capacity of gutter
      A.3 Capacity of gutter outlet
ANNEX B (INFORMATIVE) NATIONAL AND LOCAL REGULATIONS AND
                      PRACTICE
ANNEX C (INFORMATIVE) CAPACITY OF DRAINS
ANNEX D (INFORMATIVE) LOGIC DIAGRAMS
NATIONAL ANNEX NA (INFORMATIVE) MATERIALS AND COMPONENTS FOR
                  RAINWATER GOODS
NATIONAL ANNEX NB (INFORMATIVE) METEOROLOGICAL ASPECTS
NATIONAL ANNEX NC (INFORMATIVE) EFFECTIVE CATCHMENT AREA
NATIONAL ANNEX ND (INFORMATIVE) HYDRAULIC DESIGN
NATIONAL ANNEX NE (INFORMATIVE) LAYOUT, INSTALLATION,
                  INSPECTION, TESTING AND MAINTENANCE

Recommends design methods for roof and paved area drainage based on modern hydraulics and meteorological knowledge. Also deals with the choice of materials and with site-work, including inspection, testing and maintenance.

This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and commercial, institutional and industrial buildings.

This third part of this European Standard describes a method of calculating the hydraulic adequacy of non-siphonic roof drainage systems and gives performance requirements for siphonic roof drainage systems. It also sets standards for the layout and installation of roof drainage insofar as they affect flow capacity.

This part of this European Standard applies to all roof drainage systems where the outlets are large enough not to limit the flow capacity of the gutter (i.e. free discharge conditions). It applies to all materials used for roof drainage systems.

Detailed information additional to that contained in this Standard may be obtained by referring to the technical documents listed in Annex B.