Engineered thermoplastic piping for municipal stormwater collection, highway surface runoff, airport apron drainage, and regional flood mitigation infrastructure across Saudi Arabia.
Direct pricing from the Jeddah plant, with technical submittal support.
In Saudi Arabia's arid environment, stormwater events are infrequent but characterized by intense flash flooding with high sediment and debris loads. ALFA AL-ARABIA manufactures heavy-wall solid and perforated uPVC pipes (110 mm to 500 mm OD) designed for rapid stormwater conveyance. With a mirror-smooth Manning's roughness coefficient of n=0.009 and absolute immunity to aggressive sabkha soil chemistry, ALFA stormwater pipelines prevent siltation, maintain maximum hydraulic flow, and eliminate structural crown degradation for 50+ years.
| Material | uPVC (PVC-U) Solid-Wall & Perforated |
|---|---|
| Standards | DIN 19534, EN 1401, SASO 14/15, MOT Specs |
| Stiffness Classes | SN 4 & SN 8 (Heavy Highway Loading) |
| Diameter Range | 110 mm to 500 mm OD |
| Roughness Coefficient | Manning's n = 0.009 (40% higher flow than concrete) |
| Jointing | Integrated EPDM Elastomeric Rubber Ring Push-Fit |
| Key Projects | Jeddah Stormwater Masterplan, Riyadh Stormwater Trunk Mains |
Flash flooding in Saudi Arabian cities (particularly Jeddah, Riyadh, Makkah, and Tabuk) presents unique civil engineering challenges. Rainfall is characterized by short-duration, high-intensity cloudburst events where hundreds of millimeters of rain can fall within a few hours. The surrounding desert topography produces high runoff coefficients with heavy suspended sand and gravel loads.
Traditional concrete culverts and pipes suffer severe invert abrasion from high-velocity sediment transport and chemical attack from hypersaline groundwater. In contrast, uPVC piping provides exceptional abrasion resistance per DIN 19534 standards, enduring sand-slurry flows without wall loss.
Furthermore, uPVC's high flow efficiency allows municipal engineers to design shallower trench gradients while achieving the required self-cleansing velocities (>0.9 m/s for sand transport), drastically reducing rock excavation costs in mountainous or dense urban environments.
| Nominal Size | OD (mm) | SN 8 Wall (mm) | Capacity @ 0.5% (L/s) | Capacity @ 1.0% (L/s) | Max Catchment Area (m²)* |
|---|---|---|---|---|---|
| DN 160 | 160 | 4.7 | 15.8 | 22.4 | 1,500 |
| DN 200 | 200 | 5.9 | 28.5 | 40.3 | 2,800 |
| DN 250 | 250 | 7.3 | 51.2 | 72.4 | 5,200 |
| DN 315 | 315 | 9.2 | 91.0 | 128.7 | 9,500 |
| DN 400 | 400 | 11.7 | 170.5 | 241.1 | 18,000 |
| DN 500 | 500 | 14.6 | 298.0 | 421.4 | 32,000 |
For highway and arterial road crossings, ALFA specifies **SN 8 ring stiffness** pipe encased in Class B or Class S granular bedding per ASTM D2321. The flexible pipe-soil interaction mechanism allows the compacted granular backfill to support up to 95% of vertical wheel loads (including AASHTO H-20 and Saudi Ministry of Transport 60-ton truck wheel loads).
Joint flexibility is vital: each EPDM rubber-ring push-fit socket accommodates up to 3° of angular deflection, ensuring zero joint dislodgement or water leakage during regional soil settlement or seismic events.
Concrete pipes in Saudi Arabia are vulnerable to sulfate attack from sabkha soils and invert erosion from sand-laden flash floods. uPVC is 100% corrosion-proof, has a 40% higher hydraulic capacity (n=0.009 vs 0.013), weighs 80% less for rapid installation, and provides watertight push-fit joints.
SN 8 (stiffness ≥ 8 kN/m²) is mandatory under public roads, parking lots, and industrial vehicle corridors per Ministry of Transport (MOT) and Municipalities (MOMRA) regulations.
Yes. ALFA manufactures factory-welded sweep bends, catch basin lateral tees, and puddle flanges for cast-in-place concrete manhole connections.
Contact our Jeddah engineering desk for instant project-specific pricing, technical submittals, and Material Approval Request (MAR) support.
