Each city has a set of infrastructure that no-one mentions at dinner parties. Manholes. The unassuming, circular, sometimes jarring road access hole in car parks, roads and drainage systems all over Dubai, Abu Dhabi and the UAE. They keep the underground utilities of the fastest growing cities in the world intact — and the code they follow is BS EN 1917.
Whether you are a civil engineer, project manager, drainage contractor or consultant on an infrastructure project in the UAE, this guide will cover all aspects of precast concrete manhole specifications in UAE, what the BS EN 1917 standard actually entails and its relationship with the regulatory framework in the UAE at the moment.
No padding. No random statistics. The precise needs of engineers and procurers involved in real projects in the UAE.
What Is BS EN 1917 Precast Concrete Manhole Specifications UAE ?
British and European Standard for concrete manholes and inspection chambers — unreinforced concrete units, steel fibre concrete units and reinforced concrete units are included in BS EN 1917:2002. It was published in October 2002 and replaced the previous national standard BS 5911-20:1994 and earlier national standards throughout Europe.
The standard contains requirements for the performance and test methods of precast concrete units, including joints (elastomeric, plastomeric or other sealing materials, either integrated in the unit or supplied separately), for inspection chambers of inverts not exceeding 2 metres deep, and manholes of circular, rectangular or elliptical internal shape with a nominal bore not exceeding DN 1250 or a nominal length not exceeding LN 1250.
In simple terms, it’s what you’ll see in the most common manholes in any construction project in the UAE, including stormwater, sewerage, telecom ducting and utility access.
In the field, BS 5911-3, a complementary national specification, is used and provides additional coverage for larger manholes (DN 1250 – DN 3000). Both are commonly used on UAE projects.
The UAE is a country with a diverse population and culture.The UAE is a multicultural society
The construction industry operating in UAE is a combination of international codes. Dubai Municipality has implemented the Dubai Building Code (DBC), based on international standards and best practices, such as European Norms (ENs) and British Standards (BSs). In UAE projects, precast concrete manhole specifications frequently refer to BS EN 1917 as this is the specification used in the majority of projects, particularly those from the private sector and public infrastructure works supplied by precast companies based in Dubai, Abu Dhabi and Sharjah.
Manholes in the UAE should meet the standards issued by the Dubai Municipality, the Abu Dhabi Sewerage Services, UAE Fire and Safety Codes, and ISO 9001:2015 quality standards. BS EN 1917 falls easily into these terms as it covers the same set of performance criteria that those regulators are concerned with: structural strength, watertightness, joint integrity, and durability under load.
It is also important to note that the UAE concrete industry has adopted the BS EN 206, BS 8500 and Dubai Municipality approved, ready mix concrete specifications, applicable to extreme hot weather conditions. These standards are used to inform the actual mix design requirements that are used to support any BS EN 1917 compliant manhole manufactured or installed in the UAE.
Key requirements of BS EN 1917 explained Precast Concrete Manhole Specifications UAE
That’s where the practical part of the specification comes in. By understanding the technical content of the standard, you can benefit in writing compliant project specifications, auditing supplier submissions and prevent expensive non-conformances at site.
Materials and Concrete
This standard applies to three categories of units: unreinforced concrete, steel fibre concrete and conventionally reinforced concrete. Reinforced concrete units are key in UAE applications, particularly in high-traffic areas such as road crossings, car parks, and industrial areas, where loading requirements can be high.
The minimum compressive strength required of the concrete made in a BS EN 1917 compliant manhole depends on the type and application of its units. For the UAE context, the typical concrete requirement for underground civil structures is in line with the requirements in the UAE, which include the use of C35/45 to C50/60 grades, with a maximum water/cement ratio of around 0.42 and a minimum cementitious content of between 380 and 450 kg/m³, which are not only required for strength but also for the high concentration of sulphates and chlorides present throughout much of the Emirates.
The size and dimensions of the items.The dimensions and names of the items
Manholes, circular, rectangular and elliptical, are covered by BS EN 1917. The standard is applicable for nominal diameter (DN) up to DN 1250 for circular bore units. Typical drainage manhole diameters used on Dubai Municipality drainage projects are 900mm to 1800mm ID with the most common diameters as per Dubai Municipality drainage details based on pipe diameter and depth being 1000mm, 1200mm and 1500mm ID.
For Dubai Municipality sewerage manhole standard drawings, the manhole opening of the upper shaft must be 1000mm while the base manhole is specified based on the pipe diameters in and out of the manhole. The principles of this dimensional logic are the same as those defined at the product level in BS EN 1917.
Crushing Strength
Chapter A: Crushing strength test for chamber and shaft units is one of the most important tests in the standard. This test is used to determine the structural strength of the manhole ring when subjected to the compressive load. The standard specifies one strength class per nominal size (as opposed to the situation with pipes where you may specify different strengths) The standard defines the strength class, so it is not specified by the engineer.
Watertightness
The requirement of watertightness in BS EN 1917 is a key requirement and crucial performance criterion in UAE drainage and sewer applications. According to the standard, watertightness is the capability of resisting a head of water of 5 metres for 15 minutes. This is a temporary surcharge condition and NOT a permanent head pressure test. This performance is provided by the manhole system’s joint profiles, rubber gaskets, and wall thicknesses.
In sewer applications in the UAE, where usage of groundwater can lead to a significant increase in treatment costs and where the groundwater is often sulphate-rich, watertight joints cannot be compromised. Precast concrete manhole suppliers in the UAE produce rings that have rubber joint seals which are standard to meet this requirement.
Water Absorption
The water absorption test (BS EN 1917) is not a joint test; it is test of the permeability of the concrete itself. The UAE is a harsh groundwater environment and this is a critical consideration for long term durability, due to low water absorption. The test method is valid for chamber and shaft units, and the results contribute to the overall durability evaluation of the product. Typically, precast suppliers based in the UAE, which produce their precast products to this standard, have their concrete manufacturing processes involve using dense, low water-cement ratio concrete mixes to meet this requirement, which also aligns with the UAE’s concrete durability guidance for underground structures.
Joint Profiles and Sealing
The standard defines the specifications for the profile of the joints, which must be dimensioned and fitted properly when an elastomeric or plastomeric seal is used. Precast concrete manhole rings with spigot-and-socket, rubber-gasket joints are the typical method for precast manhole rings on UAE projects and provide both structural connection and watertightness without requiring sealant at each joint application.
Installed Steps
Manholes with a depth of more than about 1 metre are outside the scope of BS EN 1917, but installed steps within them are included. In UAE practice, it is specified for manholes having a depth of not more than 3.0 metres (from ground level to outlet pipe soffit), that step rungs are to be provided at regular intervals, according to the details specified by Dubai Municipality. Fixed ladders must be used for greater depths. Steps and ladders are required to meet their own applicable EN standards and in UAE projects, corrosion resistant materials such as galvanised mild steel or stainless steel are usually specified because of the humid climate and high chloride content in the region’s ground water.
Conformity Evaluation and Marking Precast Concrete Manhole Specifications UAE
BS EN 1917 includes requirements for manufacturers’ quality assurance systems. Either conform to the EN conformity requirements or maintain a system compliant to ISO 9001 are ways of gaining a Kitemark licence under this standard. In the UAE, ISO 9001:2015 certificate from the precast supplier is a basic requirement for the project and precast concrete suppliers in Dubai are usually certified with the same British / European Standards and ISO 9001:2015.
Marking shall include the nominal size, the standard number, the manufacturer’s identification and the strength class if applicable, for compliant products. Your Quality Engineer should be inspecting these markings on a well-run project in the UAE, before the first manhole ring is off the yard.
The UAE’s Climate Affects BS EN 1917 Compliance” has been released.The UAE’s Climate Affects BS EN 1917 Compliance” has just been published
Concrete does not like the climate of the UAE. The summer temperatures often exceed 45°C, local soils and ground waters contain high levels of sulphates and chloride levels are high near the coasts, creating more risk of chemical attack. A manhole that is able to pass the factory tests in a temperate European climate should be able to endure for decades underground in the Emirates.
This is why UAE precast concrete manhole specifications are more than just referring to BS EN 1917. In the drawings supplied by Dubai Municipality, epoxy paint is recommended for protection of internal surfaces of exposed concrete in new works, rubberised bitumen emulsion and waterproof tanking membranes are to be used for waterproofing, and GRP lining is recommended for rehabilitation of existing structures. These measures are not incompatible with BS EN 1917, they are complementary and additive and reflect the extra demands for durability in the local environment.
Precast suppliers within the UAE that are responsible will be using sulphate-resistant or blended cement mixes, keeping the ratio of water to cement to a minimum and adhere to the correct curing periods, such as extended periods of up to 14 days in hot weather to ensure the product performs as the specification and the standard demand.
This means that you need to understand what implications this has for your project specification
For any UAE specification being written or reviewed for precast concrete manhole, here is what good practice is. Use BS EN 1917:2002 as the product standard for manholes up to DN1250 and BS 5911-3 for manholes greater than DN1250. Only buy from ISO 9001 manufacturers and ask for concrete mill certificates or test reports for the concrete’s compressive strength and water absorption. Provide specific grades that fit the environmental conditions in UAE (usually XC4/XS1 for structures buried in Dubai and Abu Dhabi). Confirm joint type (rubber gasket spigot-and-socket) and evidence of watertightness. Ensure that your dimensional data include Dubai Municipality standard drainage drawings and requirement of the Abu Dhabi sewerage authority.
And — this is where people lose track — check the manhole cover and frame conform to the separate standard for manhole tops and gully tops (vehicular and pedestrian) which is EN 124. BS EN 1917 is for the manhole structure itself and not the cover. Both of the standards are used together and should be listed on your submittal register.
The Bottom Line
The foundation of precast concrete manhole specifications in UAE infrastructure projects is BS EN 1917. It sets the performance standards, test procedures and conformance to ensure the structural and hydraulic safety of underground access structures throughout the drainage, sewerage and utility systems of the region. Meeting the standard is not an option; it’s what good and compliant procurement means on the UAE’s civil projects.
Ensure the correct specification from the beginning, use ISO 9001 certified precast suppliers and ensure your concrete mix design is suitable for the aggressive ground conditions in the UAE. What people don’t mention at dinner parties are the manholes that are working flawlessly, beneath the surface, for the next 100 years.
