EN 1610:2015
Current
The latest, up-to-date edition.
Construction and testing of drains and sewers
02-09-2015
European foreword
1 Scope
2 Normative references
3 Terms and definitions
4 General
5 Construction components and materials
6 Construction of trench
7 General principles of embedment and support
8 Installation
9 Connection to pipes and manholes
10 Testing during construction
11 Backfilling
12 Final inspection and/or testing of pipelines and
manholes after backfilling
13 Procedures and requirements for testing gravity pipelines
14 Testing of pressure pipelines
15 Qualifications
Annex A (informative) - Dewatering
Annex B (informative) - Abstract from DIRECTIVE
2014/25/EU OF THE EUROPEAN PARLIAMENT AND
OF THE COUNCIL of 26 February 2014 on
procurement by entities operating in the water, energy,
transport and postal services sectors and repealing
Directive 2004/17/EC (Text with EEA relevance)
Annex C (informative) - Manufacturer's Instructions
Annex D (informative) - Additional national public documents
Bibliography
This European Standard is applicable to the construction and related testing of drains and sewers usually buried in the ground and usually operating under gravity but up to 0,5 kPa when surcharged.The construction of pipelines operating under pressure is covered by this European Standard together with EN 805 as appropriate (e.g. for testing).This European Standard is applicable to drains and sewers installed in trenches, under embankments or above ground. For trenchless construction EN 12889 applies. Additionally, other local or national regulations may apply, e.g. concerning health and safety, pavement reinstatement and requirements for tightness testing.NOTEFurther information is given by reference to national documents listed in Annex D.
Committee |
CEN/TC 165
|
DevelopmentNote |
Supersedes PREN 1610. (09/2015)
|
DocumentType |
Standard
|
PublisherName |
Comite Europeen de Normalisation
|
Status |
Current
|
Supersedes |
Standards | Relationship |
DIN EN 1610:2015-12 | Identical |
UNI EN 1610:2015 | Identical |
NS EN 1610 : 1997 | Identical |
NBN EN 1610 : 2015 | Identical |
PN EN 1610 : 2015 | Identical |
BS EN 1610:2015 | Identical |
UNE-EN 1610:2016 | Identical |
NF EN 1610 : 1997 | Identical |
UNI EN 1610 : 1999 | Identical |
NEN EN 1610 : 2015 | Identical |
SN EN 1610 : 2015 | Identical |
I.S. EN 1610:2015 | Identical |
BS EN 16506:2014 | Systems for renovation of drains and sewers. Lining with a rigidly anchored plastics inner layer (RAPL) |
I.S. CEN TS 1852-3:2003 | PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - POLYPROPYLENE (PP) - PART 3: GUIDANCE FOR INSTALLATION |
DIN EN 16506:2014-12 | SYSTEMS FOR RENOVATION OF DRAINS AND SEWERS - LINING WITH A RIGIDLY ANCHORED PLASTICS INNER LAYER (RAPL) |
BS EN 16323:2014 | Glossary of wastewater engineering terms |
S.R. CEN/TS 15223:2017 | PLASTICS PIPING SYSTEMS - VALIDATED DESIGN PARAMETERS OF BURIED THERMOPLASTICS PIPING SYSTEMS |
17/30358329 DC : 0 | BS EN 1295-1 - STRUCTURAL DESIGN OF BURIED PIPELINES UNDER VARIOUS CONDITIONS OF LOADING - PART 1: GENERAL REQUIREMENTS |
UNI CEN/TS 14807 : 2014 | PLASTICS PIPING SYSTEMS - GLASS-REINFORCED THERMOSETTING PLASTICS (GRP) BASED ON UNSATURATED POLYESTER RESIN (UP) - GUIDANCE FOR THE STRUCTURAL ANALYSIS OF BURIED GRP-UP PIPELINES |
BS EN 1636-6:2001 | Plastics piping systems for non-pressure drainage and sewerage. Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) Practices for installation |
UNE-CEN/TR 1295-3:2011 IN | Structural design of buried pipelines under various conditions of loading - Part 3: Common method |
BS EN 295-1:2013 | Vitrified clay pipe systems for drains and sewers Requirements for pipes, fittings and joints |
CEN/TS 14578:2013 | Plastics piping systems for water supply or drainage and sewerage - Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) - Recommended practice for installation |
CEN/TR 1295-3:2007 | Structural design of buried pipelines under various conditions of loading - Part 3: Common method |
EN 16932-2:2018 | Drain and sewer systems outside buildings - Pumping systems - Part 2: Positive pressure systems |
CEN/TS 14807:2013 | Plastics piping systems - Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP) - Guidance for the structural analysis of buried GRP-UP pipelines |
VDI 6022 Blatt 1.2:2014-06 | Ventilation and indoor-air quality - Hygiene requirements for ventilation and air-conditioning systems and units - Requirements for underground components (VDI Ventilation Code of Practice) |
ENV 1401-3:2001 | Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride) (PVC-U) - Part 3: Guidance for installation |
03/117538 DC : DRAFT NOV 2003 | EN 14801 - CONDITIONS FOR PRESSURE CLASSIFICATION OF PRODUCTS FOR WATER AND WASTE WATER PIPELINES |
DIN EN 14654-2:2013-03 | Management and control of operational activities in drain and sewer systems outside buildings - Part 2: Rehabilitation |
15/30327642 DC : 0 | BS EN 13476-1 - PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - STRUCTURED-WALL PIPING SYSTEMS OF UNPLASTICIZED POLY(VINYL CHLORIDE) (PVC-U), POLYPROPYLENE (PP) AND POLYETHYLENE (PE) - PART 1: GENERAL REQUIREMENTS AND PERFORMANCE CHARACTERISTICS |
05/30131069 DC : DRAFT MAR 2005 | EN 598:2005 - DUCTILE IRON PIPES, FITTINGS, ACCESSORIES AND THEIR JOINTS FOR SEWERAGE APPLICATIONS - REQUIREMENTS AND TEST METHODS |
S.R. CEN/TR 17179:2018 | THERMOPLASTICS PIPING AND DUCTING SYSTEMS - RAINWATER INFILTRATION AND STORAGE ATTENUATION SYSTEMS - PRACTICES FOR UNDERGROUND INSTALLATION |
I.S. EN 13566-1:2003 | PLASTICS PIPING SYSTEMS FOR RENOVATION OF UNDERGROUND NON-PRESSURE DRAINAGE AND SEWERAGE NETWORKS - PART 1: GENERAL |
08/30173998 DC : DRAFT JUNE 2008 | BS ISO 11296-1 - PLASTICS PIPING SYSTEMS FOR RENOVATION OF UNDERGROUND NON-PRESSURE DRAINAGE AND SEWERAGE NETWORKS - PART 1: GENERAL |
PD CEN/TR 1295-4:2015 | Structural design of buried pipelines under various conditions of loading Parameters for reliability of the design |
I.S. EN 16932-1:2018 | DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PUMPING SYSTEMS - PART 1: GENERAL REQUIREMENTS |
PREN 1295-1 : DRAFT 2017 | STRUCTURAL DESIGN OF BURIED PIPELINES UNDER VARIOUS CONDITIONS OF LOADING - PART 1: GENERAL REQUIREMENTS |
I.S. EN 16323:2014 | GLOSSARY OF WASTEWATER ENGINEERING TERMS |
S.R. CEN/TS 14578:2013 | PLASTICS PIPING SYSTEMS FOR WATER SUPPLY OR DRAINAGE AND SEWERAGE - GLASS-REINFORCED THERMOSETTING PLASTICS (GRP) BASED ON UNSATURATED POLYESTER RESIN (UP) - RECOMMENDED PRACTICE FOR INSTALLATION |
I.S. EN 16932-2:2018 | DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PUMPING SYSTEMS - PART 2: GENERAL REQUIREMENTS |
I.S. EN 14654-2:2013 | MANAGEMENT AND CONTROL OF OPERATIONAL ACTIVITIES IN DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PART 2: REHABILITATION |
PREN 295-1 : DRAFT 2010 | VITRIFIED CLAY PIPE SYSTEMS FOR DRAINS AND SEWERS - PART 1: REQUIREMENTS FOR PIPES, FITTINGS AND JOINTS |
DIN EN ISO 11296-1:2011-07 | PLASTICS PIPING SYSTEMS FOR RENOVATION OF UNDERGROUND NON-PRESSURE DRAINAGE AND SEWERAGE NETWORKS - PART 1: GENERAL |
PREN 752 : DRAFT 2015 | DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - SEWER SYSTEM MANAGEMENT |
DIN EN 598:2009-10 | Ductile iron pipes, fittings, accessories and their joints for sewerage applications - Requirements and test methods (includes Amendment A1:2009) |
BS EN 598 : 2007 | DUCTILE IRON PIPES, FITTINGS, ACCESSORIES AND THEIR JOINTS FOR SEWERAGE APPLICATIONS - REQUIREMENTS AND TEST METHODS |
BS EN 13380:2001 | General requirements for components used for renovation and repair of drain and sewer systems outside buildings |
DIN EN 752:2015-10 (Draft) | DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - SEWER SYSTEM MANAGEMENT |
I.S. EN 598:2007 | DUCTILE IRON PIPES, FITTINGS, ACCESSORIES AND THEIR JOINTS FOR SEWERAGE APPLICATIONS - REQUIREMENTS AND TEST METHODS |
I.S. EN 13508-1:2012 | INVESTIGATION AND ASSESSMENT OF DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PART 1: GENERAL REQUIREMENTS |
EN 14654-2:2013 | Management and control of operational activities in drain and sewer systems outside buildings - Part 2: Rehabilitation |
S.R. CEN TR 1295-3:2007 | STRUCTURAL DESIGN OF BURIED PIPELINES UNDER VARIOUS CONDITIONS OF LOADING - PART 3: COMMON METHOD |
I.S. EN 295-1:2013 | VITRIFIED CLAY PIPE SYSTEMS FOR DRAINS AND SEWERS - PART 1: REQUIREMENTS FOR PIPES, FITTINGS AND JOINTS |
VDI 3810 Blatt 2:2010-05 | Operation and maintenance of building installations - Sanitary systems |
VDI 2070:2013-03 | Service water management for buildings and estates |
DIN V 4034-1:2004-08 | PREFABRICATED CONCRETE MANHOLES, UNREINFORCED, STEEL FIBRE AND REINFORCED FOR DRAINS AND SEWERS - TYPE 1 AND TYPE 2 - PART 1: REQUIREMENTS, TEST METHODS AND EVALUATION OF CONFORMITY |
11/30250267 DC : 0 | BS EN 16323 - GLOSSARY OF WASTEWATER ENGINEERING TERMS |
DD CEN/TS 14578:2003 | Plastics piping systems for water supply or drainage and sewerage. Glass-reinforced thermosetting plastics (GPR) based on unsaturated polyester resin (UP). Recommended practice for installation |
DD CEN/TS 14758-3:2006 | Plastics piping systems for non-pressure underground drainage and sewerage. Polypropylene with mineral modifier(s)(PP-MD) Guidance for installation |
DD CEN/TS 1852-3:2003 | Plastics piping systems for non-pressure underground drainage and sewerage. Polypropylene (PP) Guidance for installation |
CEN/TR 17179:2018 | Thermoplastics piping and ducting systems - Rainwater infiltration and storage attenuation systems - Practices for underground installation |
PREN 16506 : DRAFT 2012 | SYSTEMS FOR RENOVATION OF DRAINS AND SEWERS - LINING WITH A RIGIDLY ANCHORED PLASTICS INNER LAYER (RAPL) |
UNI EN 16506 : 2014 | SYSTEMS FOR RENOVATION OF DRAINS AND SEWERS - LINING WITH A RIGIDLY ANCHORED PLASTICS INNER LAYER (RAPL) |
BS EN 14654-2:2013 | Management and control of operational activities in drain and sewer systems outside buildings Rehabilitation |
CEN/TR 1046:2013 | Thermoplastics piping and ducting systems - Systems outside building structures for the conveyance of water or sewage - Practices for underground installation |
PD CEN/TS 14578:2013 | Plastics piping systems for water supply or drainage and sewerage. Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP). Recommended practice for installation |
UNI EN 16323 : 2014 | GLOSSARY OF WASTEWATER ENGINEERING TERMS |
BS EN 16932-2:2018 | Drain and sewer systems outside buildings. Pumping systems Positive pressure systems |
UNE-EN ISO 11296-1:2011 | Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 1: General (ISO 11296-1:2009) |
I.S. CEN TS 14758-3:2006 | PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - POLYPROPYLENE WITH MINERAL MODIFIER(S) (PP-MD) - PART 3: GUIDANCE FOR INSTALLATION |
I.S. CEN TS 14578:2003 | PLASTICS PIPING SYSTEMS FOR WATER SUPPLY OR DRAINAGE AND SEWERAGE - GLASS-REINFORCED THERMOSETTING PLASTICS (GPR) BASED ON UNSATURATED POLYESTER RESIN (UP) - RECOMMENDED PRACTICE FOR INSTALLATION |
NF EN ISO 11296-1 : 2011 | PLASTICS PIPING SYSTEMS FOR RENOVATION OF UNDERGROUND NON-PRESSURE DRAINAGE AND SEWERAGE NETWORKS - PART 1: GENERAL |
DIN EN 13476-1:2015-11 (Draft) | PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - STRUCTURED-WALL PIPING SYSTEMS OF UNPLASTICIZED POLY(VINYL CHLORIDE) (PVC-U), POLYPROPYLENE (PP) AND POLYETHYLENE (PE) - PART 1: GENERAL REQUIREMENTS AND PERFORMANCE CHARACTERISTICS |
EN 16932-1:2018 | Drain and sewer systems outside buildings - Pumping systems - Part 1: General requirements |
EN 16506:2014 | Systems for renovation of drains and sewers - Lining with a rigidly anchored plastics inner layer (RAPL) |
UNI EN 13508-1 : 2012 | INVESTIGATION AND ASSESSMENT OF DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PART 1: GENERAL REQUIREMENTS |
UNI EN 598 : 2009 | DUCTILE IRON PIPES, FITTINGS, ACCESSORIES AND THEIR JOINTS FOR SEWERAGE APPLICATIONS - REQUIREMENTS AND TEST METHODS |
DIN EN 16323:2014-07 | GLOSSARY OF WASTEWATER ENGINEERING TERMS |
I.S. EN 752:2017 | DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - SEWER SYSTEM MANAGEMENT |
12/30275810 DC : 0 | BS EN 16506 - SYSTEMS FOR RENOVATION OF DRAINS AND SEWERS - LINING WITH A RIGIDLY ANCHORED PLASTICS INNER LAYER (RAPL) |
DIN 1986-3:2004-11 | Drainage systems on private ground - Part 3: Specifications for service and maintenance |
15/30317327 DC : 0 | BS EN 16941-1 - ON-SITE NON-POTABLE WATER SYSTEMS - PART 1: SYSTEMS FOR THE USE OF RAINWATER |
PD CEN/TR 15128:2005 | Survey of European standards for rehabilitation of drain and sewer systems |
10/30231796 DC : 0 | BS EN 14654-2 - MANAGEMENT AND CONTROL OF CLEANING OPERATIONS IN DRAINS AND SEWERS - PART 2: REHABILITATION |
DD ENV 1401-3:2001 | Plastics piping systems for non-pressure underground drainage and sewerage. Unplasticized poly(vinylchloride) (PVC-U) Guidance for installation |
15/30325882 DC : 0 | BS EN 16932-1 - DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PUMPING SYSTEMS - PART 1: GENERAL REQUIREMENTS |
BS EN 13476-1:2007 | Plastics piping systems for non-pressure underground drainage and sewerage. Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) General requirements and performance characteristics |
PREN 13476-1 : DRAFT 2015 | PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - STRUCTURED-WALL PIPING SYSTEMS OF UNPLASTICIZED POLY(VINYLSEWERAGE - STRUCTURED-WALL PIPING SYSTEMS OF UNPLASTICIZED POLY(VINYL - PART 1: GENERAL REQUIREMENTS AND PERFORMANCE CHARACTERISTICS |
CEN/TS 15223:2017 | Plastics piping systems - Validated design parameters of buried thermoplastics piping systems |
ISO 21138-1:2007 | Plastics piping systems for non-pressure underground drainage and sewerage Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) Part 1: Material specifications and performance criteria for pipes, fittings and system |
EN 13476-1:2018 | Plastics piping systems for non-pressure underground drainage and sewerage - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 1:General requirements and performance characteristics |
DIN EN 295-1:2013-05 | VITRIFIED CLAY PIPE SYSTEMS FOR DRAINS AND SEWERS - PART 1: REQUIREMENTS FOR PIPES, FITTINGS AND JOINTS |
UNE-EN 13508-1:2014 | Investigation and assessment of drain and sewer systems outside buildings - Part 1: General Requirements |
BS EN 14801:2006 | Conditions for pressure classification of products for water and wastewater pipelines |
BS EN 12056-2:2000 | Gravity drainage systems inside buildings Sanitary pipework, layout and calculation |
EN 14801:2006 | Conditions for pressure classification of products for water and wastewater pipelines |
EN 752:2017 | Drain and sewer systems outside buildings - Sewer system management |
EN 598:2007+A1:2009 | Ductile iron pipes, fittings, accessories and their joints for sewerage applications - Requirements and test methods |
EN 295-1:2013 | Vitrified clay pipe systems for drains and sewers - Part 1: Requirements for pipes, fittings and joints |
EN 16323:2014 | Glossary of wastewater engineering terms |
10/30216984 DC : 0 | BS EN 295-1 - VITRIFIED CLAY PIPE SYSTEMS FOR DRAINS AND SEWERS - PART 1: REQUIREMENTS FOR PIPES, FITTINGS AND JOINTS |
PD CEN/TS 14807:2013 | Plastics piping systems. Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP). Guidance for the structural analysis of buried GRP-UP pipelines |
I.S. EN 13476-1:2007 | PLASTICS PIPING SYSTEMS FOR NON-PRESSURE UNDERGROUND DRAINAGE AND SEWERAGE - STRUCTURED-WALL PIPING SYSTEMS OF UNPLASTICIZED POLY (VINYL CHLORIDE) (PVC-U), POLYPROPYLENE (PP) AND POLYETHYLENE (PE) - PART 1: GENERAL REQUIREMENTS AND PERFORMANCE CHARACTERISTICS |
CEN/TR 1295-4:2015 | Structural design of buried pipelines under various conditions of loading - Part 4: Parameters for reliability of the design |
UNE-EN 16506:2015 | Systems for renovation of drains and sewers - Lining with a rigidly anchored plastics inner layer (RAPL) |
17/30362689 DC : 0 | BS EN 16941-2 - ON-SITE NON-POTABLE WATER SYSTEMS - PART 2: SYSTEMS FOR THE USE OF TREATED GREYWATER |
S.R. CEN/TR 1046:2013 | THERMOPLASTICS PIPING AND DUCTING SYSTEMS - SYSTEMS OUTSIDE BUILDING STRUCTURES FOR THE CONVEYANCE OF WATER OR SEWAGE - PRACTICES FOR UNDERGROUND INSTALLATION |
S.R. CEN/TR 1295-4:2015 | STRUCTURAL DESIGN OF BURIED PIPELINES UNDER VARIOUS CONDITIONS OF LOADING - PART 4: PARAMETERS FOR RELIABILITY OF THE DESIGN |
I.S. EN 16506:2014 | SYSTEMS FOR RENOVATION OF DRAINS AND SEWERS - LINING WITH A RIGIDLY ANCHORED PLASTICS INNER LAYER (RAPL) |
S.R. CEN/TS 14807:2013 | PLASTICS PIPING SYSTEMS - GLASS-REINFORCED THERMOSETTING PLASTICS (GRP) BASED ON UNSATURATED POLYESTER RESIN (UP) - GUIDANCE FOR THE STRUCTURAL ANALYSIS OF BURIED GRP-UP PIPELINES |
UNI CEN/TS 14578 : 2014 | PLASTICS PIPING SYSTEMS FOR WATER SUPPLY OR DRAINAGE AND SEWERAGE - GLASS-REINFORCED THERMOSETTING PLASTICS (GRP) BASED ON UNSATURATED POLYESTER RESIN (UP) - RECOMMENDED PRACTICE FOR INSTALLATION |
UNE-EN 16323:2014 | Glossary of wastewater engineering terms |
I.S. CEN TR 15128:2005 | SURVEY OF EUROPEAN STANDARDS FOR REHABILITATION OF DRAIN AND SEWER SYSTEMS |
I.S. CEN TS 14807:2004 | PLASTICS PIPING SYSTEMS - GLASS-REINFORCED THERMOSETTING PLASTICS (GRP) BASED ON UNSATURATED POLYESTER RESIN (UP) - GUIDANCE FOR THE STRUCTURAL ANALYSIS OF BURIED GRP-UP PIPELINES |
DIN EN 13508-1:2013-01 | INVESTIGATION AND ASSESSMENT OF DRAIN AND SEWER SYSTEMS OUTSIDE BUILDINGS - PART 1: GENERAL REQUIREMENTS |
BS EN 13508-1:2012 | Investigation and assessment of drain and sewer systems outside buildings General Requirements |
UNE-EN 295-1:2013 | Vitrified clay pipe systems for drains and sewers - Part 1: Requirements for pipes, fittings and joints |
BS EN 13566-1:2002 | Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks General |
EN 13566-1:2002 | Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks - Part 1: General |
CEN/TR 15128:2005 | Survey of European Standards for rehabilitation of drain and sewer systems |
CEN/TS 14758-3:2006 | Plastics piping systems for non-pressure underground drainage and sewerage - Polypropylene with mineral modifier(s) (PP-MD) - Part 3: Guidance for installation |
DIN EN 14801:2006-09 | CONDITIONS FOR PRESSURE CLASSIFICATION OF PRODUCTS FOR WATER AND WASTEWATER PIPELINES |
EN 13380:2001 | General requirements for components used for renovation and repair of drain and sewer systems outside buildings |
EN 13508-1:2012 | Investigation and assessment of drain and sewer systems outside buildings - Part 1: General Requirements |
EN 1295-1:1997 | Structural design of buried pipelines under various conditions of loading - Part 1: General requirements |
EN 805:2000 | Water supply - Requirements for systems and components outside buildings |
EN 16323:2014 | Glossary of wastewater engineering terms |
EN 476:2011 | General requirements for components used in drains and sewers |
EN 12889:2000 | Trenchless construction and testing of drains and sewers |
EN 752:2017 | Drain and sewer systems outside buildings - Sewer system management |
EN 13508-2:2003+A1:2011 | Investigation and assessment of drain and sewer systems outside buildings - Part 2: Visual inspection coding system |
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