1、STD.BSI BS EN 12056-3-ENGL 2000 111 Lb24bb9 0874078 T4 b BRITISH STANDARD Gravity drainage systems inside buildings - Part 3: Roof drainage, layout and calculation The European Standard EN 1205Kk2 has the status of a British Standard ICs 91.060.20; 91.140.80 NO COPYING WITHOUT BSI PERMISSION EXCEPT
2、AS PERMTED BY COPYRIGHT LAW BS EN 1205 6-3 :2000 STD-BSI BS EN L205b-3-ENGL 2000 II Lb24bb9 0874079 830 H BS EN 12066-3:2000 AmdNo. on 15 September 2000 National foreword Date Comments ”his British Standad is the official Engiish ianguage version of EN 1205W.2000. It supersedes BS 6367:1983 which is
3、 withdrawn. The UK participation in its preparation was entrusted by Technid Committee B/505, Wastewater engineering, to Subcommittee B/505/21, Roof drainage and sanita pipework, which has the responsibility to: - aid enquirers to understand the te% - present to the responsible European committee an
4、y enquiries on the - monitor related intedonai and European developments and promuigate A list of orgmimtions represented on this subcommittee can be obtained on request to its secrehy. The national annexes are an informative element of this standard and contain infonnation provided to support easie
5、r implementation of EN 1205Zk2000 in the United Kingdom, within the hework envisaged by the scope of that standard They therefore constitute a revision of those parts of BS 63671983 that are not otherwise superseded by BS EN 12056-32000. However, users are reminded that only the nonnative elements o
6、f the adopted European Standard set out the provisions to which it is necessary to conform in order to form part of a trade description when citing this British Standard by number or when compliance with it is claimed Cross-references “he British Standards which implement intemationai or European pu
7、blications referred to in this document may be found in the MI Standards Catalogue under the section entitled “Intedonai Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include ali the necessary provis
8、ions of a contract. Usem of British Standards are responsible for their correct application. Additional information It is recognized that Fgure 2, Figure 3, Figure 4 and Figure 11, dong with the logic diagrams contained in annex D, are of poor e. This has been reported to CEN in a proposal to correc
9、t them in the Engish language version of EN 1205632000. Until the standard is corrected, which BSI is not authorized to do, it is strongly recommended that these gures be used with care. Textual errors The textual errors set out below were discovered when the English language version of EN 1205Zk200
10、0 was adopted as the nationai standard. “hey have been reported to CEN in a proposal to mend the text of the European Standard. interpretation, or proposals for change, and keep the UK interests informed; them in the UK - Note 1 to Figure 8 should refer to Table 8, 91.140.80 English version Gravity
11、drainage systems inside buildings - Part 3: Roof drainage, layout and calculation Rseaux dvacuation gravitaire lintrieur des btiments - Partie 3: Systme dvacuation des eaux pluviales, conception et calculs Schwerkratentwsserungsanlagen innerhalb von Gebuden - Teil 3: Dachentwsserung, Planung und Bem
12、essung This European Standard was approved by CEN on 27 October 1999. CEN members are bound to comply with the CENICENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographi
13、cal references concerning sich national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by trmslation under the responsibility of a CEN m
14、ember into its own language and notified to the Central Secretariat has the same status as he official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway. Port
15、ugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITEE FOR STANDARDIZATION COMIT EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide fo
16、r CEN national Members. Ref. No. EN 12056-32000 E STD.BS1 BS EN 12056-3-ENGL 2000 I1624669 0874083 499 9 Page 2 EN 12056-312000 Contents Page 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 Rainf
17、all 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
18、.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.l A.2 Capacity of gutter A.3 Capacity of gutter outlet ANNEX B (INFORMATIVE) NATIONAL AND LOCAL REGULATIONS AND PRACTICE ANNEX C (INF
19、ORMATIVE) CAPACITY OF DRAINS ANNEX D (INFORMATIVE) LOGIC DIAGRAMS Capacity of gutter and outlet in combination 3 4 5 6 6 7 8 8 9 10 11 11 14 19 21 26 26 27 28 28 29 29 29 29 29 29 29 30 30 31 31 32 32 33 38 39 Q BSI 09-2000 STD-BSI BS EN 12056-3-ENGL 2000 Lb24bb9 i2874082 325 W Page 3 EN 12056-31200
20、0 Foreword This European Standard has been prepared by Technical Committee CENTTC 165 “Waste water engineering“, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the late
21、st by December 2000, and conflicting national standards shall be withdrawn at the latest by June 2001. This part is the third in a series relating to the functional requirements of gravity drainage systems inside buildings. There will be five parts, as follows: Gravity drainage systems inside buildi
22、ngs Pari 1 : General and performance requirements Part 2: Sanitary pipework - Layout and calculation Part 3: Roof drainage - Layout and calculation Part 4: Waste water lifting plants - Layout and calculation Part 5: Installation and testing, instructions for operation, maintenance and use According
23、to the CENICENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Noway, Portugal, Spai
24、n, Sweden, Switzerland and the United Kingdom. O BSI 09-2000 sTD.BSI BS EN L205b-3-ENGL 2000 111 Lb24bb7 0874083 261 m Page 4 EN 12056-312000 1 Scope This European Standard applies to wastewater drainage systems, which operate under gravity. It is applicable for drainage systems inside dwellings and
25、 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 a
26、nd installation of roof drainage insofar as they affect flow capacity. This pari 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 (.e. free discharge conditions). It applies to all materials used for roof d
27、rainage systems. Detailed information additional to that contained in this Standard may be obtained by referring to the technical documents listed in Annex B. Q BSI 09-2000 2 STD.BS1 BS EN 12056-3-ENGL 2000 Lb24bb9 0874084 LTB Page 5 EN 12056-312000 Normative references This European Standard incorp
28、orates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Europ
29、ean Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 12056-1 Gravity drainage systems inside buildings Part 1 : General and performance requirements EN 12056-2: Gravity drainage systems inside buildin
30、gs Part 2: Sanitary pipework, layout and calculation EN 12056-5 Gravity drainage systems inside buildings Part 5: Installation and testing, instructions for operation, maintenance and use O BSI 09-2000 STD.8SI BS EN L205b-3-ENGL 2000 1b24bb 0874085 034 m Page 6 EN 12056-3:2000 3 Definitions and symb
31、ols 3.1 Definitions For the purposes of this European Standard, the following definitions apply: 3. I .I gutter angle deviation in gutter direction 3.1.2 design water depth maximum depth of water under design rainfall conditions 3.1.3 drainage length length of gutter from a stop end to an outlet or
32、half the distance between adjacent outlets, in millimetres 3.1.4 eaves gutter gutter where any spillover will discharge outside the building 3.1.5 flat sole sole of the gutter, which is horizontal in cross-section for at least the width of the outlet 3.1.6 freeboard total depth of gutter minus the d
33、esigned water depth 3.1.7 long gutter gutter whose drainage length is greater than 50 times its design water depth 3.1.8 roof drainage of buildings ali pipework and fittings outside and inside, fixed to or passing through the building structure, including drains below the building, to the point of c
34、onnection to the buried drain adjacent to the building, used to remove precipitation from a roof (See Scope of EN 12056-1.) 3.1.9 short gutter gutter whose drainage length is not greater than 50 times its design water depth 3.1.1 O siphonic drainage system drainage system in which the outlets and pi
35、pework enable the system to flow completely full under design conditions and make use of the total head available between the outlets and the discharge point 3.1 .I 1 spillover level level at which water will overflow the gutter Q BSI 09-2000 Page 7 EN 12056-3:2000 3.2 Symbols For the purposes of th
36、is European Standard, the following symbols have been used: ortion of cross-section of rainwater pipe filled with Q rate of flow of water I/s 4.1 Qd drain capacity I/s annex C QL design capacity of “short“ gutter, laid level I/s 5.1.2 QN nominal capacity of gutter I/s 5.1.2 Qo total flow to an outle
37、t (calculated on area drained VS Table 7 multililied bv the rainfall intensitv Q BSI 09-2000 STD.BSI BS EN L205b-3-ENGL 2000 Lb24bb9 0674087 907 Page 8 EN 12056-3:2000 P wetted perimeter mm annex A v flow velocity m/S annex C W design water depth mm Figure 4 Z total depth of gutter to spillover leve
38、l, including mm Figure 4 V kinematic viscosity of water m/s annex C freeboard 4 Runoff ca I cu I at ions 4.1 Quantity of rainwater runoff The rate of flow of rainwater to be drained away from a roof under steady state conditions shall be calculated from equation 1: where Q r A C is the rate of flow
39、of water, in litres per second (Vs); is the rainfall intensity, in litres per second per square metre I/. mz); is the effective roof area, in square metres (mz); is a runoff coefficient (taken as 1 ,O unless national and local regulations and practice state otherwise), dimensionless. 0 BSI 09-2000 S
40、TD.BSI BS EN 12056-3-ENGL 2000 w Lb24669 0874088 843 Page 9 EN 12056-312000 4.2 Rainfall intensity, r 4.2.1 Where there is adequate statistical rainfall data related to the frequency of recurrence of storms of specific intensity and duration, the rainfall intensity, r, used in equation I shall be ch
41、osen with due regard to the nature and use of the building and appropriate to the degree of risk that can be accepted. Where statistical rainfall data is used, clause 4.2.2 shall not apply. Where statistical rainfall data does not exist, a minimum rainfall intensity used as a basis for design shall
42、be chosen from the intensities listed in Table 1, appropriate to the climate at the location of the building and in accordance with national and local regulations and practice. The minimum rainfall intensity shall be multiplied by a risk factor given in Table 2 to give the rainfall intensity, r, to
43、be used in equation I, unless national and local regulations and practice state otherwise. 4.2.2 Rainfall intensity I/(S . m2) 0,010 0,015 0,020 0,025 O, 030 0,040 0,050 0,060 .4 Table 1 - Rainfall intensity rates Table 2 - Risk factors Situation Risk factor Eaves gutters 1 ,o Eaves gutters where wa
44、ter overflowing would cause particular inconvenience, e.g. over entrances to public buildings 135 Non-eaves gutters and in all other circumstances where abnormally heavy rain or building For non-eaves gutters in buildings where an exceptional degree of protection is necessary, eng. blockage in the r
45、oof drainage system could cause water to spillover into the 2,o - hospital operating theatres - critical communications facilities - storage for substances that give off toxic or flammable fumes when wet buildings housing outstanding works of art - BSI 09-2000 STD-BSI BS EN L205b-3-ENtL 2000 LbZrlbb
46、9 0874089 7BT Page 10 EN 12056-3:2000 4.3 Effective roof area, A 4.3.1 No allowance shall be made for the effects of wind when calculating the effective roof area, unless national and local regulations and practice state otherwise. 4.3.2 Where no allowance is made for wind, the effective roof area s
47、hall be calculated from equation (2): where A LR BR is the effective roof area, in square metres (m); is the length of roof to be drained (see Figure I), in metres (m); is the width of roof from gutter to ridge (see Figure I), in metres (m). 4.3.3 Where allowance is made for wind, the effective roof
48、 area shall be calculated in accordance with a method selected from Table 3. 4.3.4 In areas where wind is taken into account in rainfall calculations, where rain driven against a wall by the wind can run down onto the roof or into a gutter, 50% of the area of the wall shall be added to the effective
49、 area of the roof. Table 3 - Effective impermeable roof area is the distance from gutter to ridge measured along the roof, in metres (m); is the effective impermeable roof area, in square metres (m). Figure 1 illustrates these dimensions. Q BSI 09-2000 STD.BSI BS EN L205b-3-ENGL 2000 Lb24bb 08iLiOO 4TL E Page 11 EN 12056-3:2000 5 Hydraulic design 5.1 Eaves gutters 5.1.1 Gutters may be laid level or to a gradient, unless stated otherwise by local or national regulation. A gutter laid to a nominal gradient of 3 mm/m or less (referred to as “nominal
