Drainage systems across the UAE 

Scope of work

• Drainage layout review checking pipe gradients, stack positions and vent arrangements against floor finishes, beams and slab drops before cast-in sleeves are fixed.
• Soil and waste stacks in towers with offsets, access points and stack venting arranged so traps are not siphoned when many floors discharge together.
• Below-ground drainage with manholes, inspection chambers and connection to the municipal sewer or to a septic or treatment arrangement where no sewer exists.
• Basement sump pits with duty and standby submersible pumps, high-level alarms and non-return valves to handle car park wash-down and ingress water.
• Roof and podium rainwater outlets and downpipes sized for short, intense storms that occur during UAE winters.
• AC condensate drainage collected from AHUs and fan coils, routed with trapped connections and, where specified, reused for irrigation.
• Grease interceptors for kitchens and oil interceptors for car parks and workshops before discharge to the public system.
• Water and air testing of all drainage, CCTV survey of buried lines where specified, and municipality inspection.

Systems we install

• uPVC or HDPE soil, waste and vent pipework
• Cast iron or acoustic pipes for noise-sensitive stacks in hotels
• Submersible sump pumps with duty/standby control
• Grease and oil interceptors before sewer connection
• Roof drains, siphonic outlets and rainwater downpipes
• Condensate collection and reuse lines
• Manholes, inspection chambers and gully traps

Codes, standards and approvals

• Dubai Municipality, Sharjah Municipality or Abu Dhabi DMT drainage regulations governing sewer connection, interceptors and inspection.
• Master developer and Trakhees or DDA requirements in communities and free zones with their own infrastructure.
• Al Sa'fat and Estidama Pearl requirements that encourage condensate recovery and efficient water use.
• UAE Fire & Life Safety Code where fire-fighting water discharge and sprinkler drain points need disposal routes.
• Civil Defence requirements on drainage of sprinkler test valves and fire pump test lines to suitable drains.
• Etihad WE, SEWA or other local utility and municipality procedures in the northern emirates, where sewer availability varies and treatment or holding tanks may still be required on some plots.

UAE site and climate challenges

• Rain is infrequent but can be very heavy over short periods, so roof outlets and downpipes are sized for storm intensity, and overflows prevent water ponding on flat roofs and podiums.
• Condensate from large AHUs produces significant volumes of clean water every summer day, so it is collected and, where the design allows, reused for irrigation instead of being discharged to sewer.
• High groundwater and saline soils in coastal areas can cause basement water ingress and corrosion of buried fittings, so sump capacity and corrosion-resistant materials are considered.
• Long periods without use can dry out traps in unoccupied apartments, allowing odours, so trap primers or deep-seal traps are used where appropriate.
• Construction debris, cement slurry and sand easily enter open floor drains and stacks, causing blockages soon after occupation, so drains are capped during works and lines are flushed and inspected before handover.

Decisions to make early

• uPVC versus cast iron or acoustic pipes, trading cost against noise reduction in hotels and premium residential towers where stacks pass close to bedrooms.
• Gravity drainage versus pumped drainage for basements, where pumping adds energy use and maintenance but allows deeper basements and connection to a shallow municipal sewer.
• Condensate reuse, which saves irrigation water every summer day but needs collection pipework, storage, filtration and coordination with landscaping contractors and the irrigation programme.
• Siphonic versus conventional roof drainage for large malls and warehouses, where siphonic reduces pipe sizes and below-ground runs but requires precise design and installation.
• Single-stack versus separately vented drainage in towers, where single-stack saves shaft space but needs careful sizing and offsets, while separate venting is more forgiving but occupies more riser area.

What you receive at handover

• Water and air test records for all drainage stacks
• CCTV survey of buried drainage where specified
• Sump pump commissioning and alarm test records
• Municipality inspection approval for sewer connection
• As-built drainage drawings with invert levels
• Interceptor commissioning and maintenance guidance

Relevant Manolia projects

Frequently asked questions