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

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.