Engineered perforation slotting for foundation dewatering, highway sub-base drainage, and date farm soil salinity leaching.
Direct pricing from the Jeddah plant, with technical submittal support.
Product photos from ALFA assets and supporting catalogue imagery for this family — for visual reference during specification and RFQ.
ALFA manufactures slotted and perforated PVC pipes conforming to DIN 1187 and ASTM F758. Designed for sub-base groundwater collection, structural foundation dewatering in high water-table coastal zones, and commercial agricultural subsurface salinity leaching.
Slotted & Drilled Subsurface Dewatering (110mm - 315mm)
View Detailed Sizing & Specs →| Nominal Size (DN) | Slot Width (mm) | Slot Length (mm) | Perforation Pattern | Water Inlet Area (cm²/m) | Recommended Soil Application |
|---|---|---|---|---|---|
| DN 110 | 1.5 mm | 15 mm | 220° Semi-Perforated | > 50 cm²/m | Building basement foundation dewatering |
| DN 160 | 2.0 mm | 20 mm | 360° Fully Perforated | > 80 cm²/m | Highway sub-base & airport runway drainage |
| DN 200 | 2.5 mm | 25 mm | 360° Fully Perforated | > 100 cm²/m | Agricultural date farm soil salinity leaching |
| DN 250 | 3.0 mm | 30 mm | 120° Crown Infiltration | > 60 cm²/m | High-volume landfill & civil stormwater trenches |
Our Perforated Subsurface Drainage Pipes are manufactured using 100% virgin lead-free resin under strict ISO 9001 and Saudi Aramco Vendor #10116102 quality standards, delivering superior burst strength, thermal stability, and corrosion immunity.
Depending on the exact specification, systems comply with DIN 1187, ASTM F758, BS 4962.
Available in sizes from 110 mm to 315 mm, supporting Non-pressure Gravity Infiltration (SN 4 / SN 8).
Thermoplastic piping provides 100% galvanic corrosion immunity, making it impervious to high sulfate and chloride sabkha soils found in coastal Saudi regions.
Every order is accompanied by factory mill test certificates (MTC), dimensional compliance sheets, and third-party laboratory burst test reports.
Yes, our Jeddah fabrication plant manufactures matching sweep bends, tees, and flange adaptors fully rated for system working pressures.
Western Province: 24h; Central/Riyadh: 24-48h; Eastern/Northern/Southern: 48-72h.
Upload your tender BOQ schedule using the upload modal on this page or email sales@alfaalarabia.co for immediate factory-direct pricing.
Subsurface groundwater enters the pipe through precision slots along the crown or perimeter, where it flows by gravity along the unperforated pipe invert to a discharge sump, relieving hydrostatic uplift on basement slabs.
Smooth-bore rigid PVC maintains a consistent gradient without sagging or silt traps, offers up to 40% higher water velocity (n = 0.009 vs 0.015 for corrugated), and allows easy mechanical rodding and jet cleaning.
Non-woven needle-punched polypropylene geotextile wrap (apparent opening size AOS 100–150 μm) prevents sand and fine silt infiltration into the pipe slots while allowing unrestricted groundwater flow.
In 220° slotted pipes, the solid unperforated bottom invert (140° arc) retains collected water, preventing collected groundwater from leaking back out into drier soil further down the trench gradient.
Deep agricultural perforated lines create a continuous leaching pathway, collecting saline irrigation runoff before it can evaporate and deposit toxic salt crystals in the date palm feeder root zone.
ALFA's computerized precision slotting geometry preserves circumferential structural integrity, maintaining ring stiffness compliant with SN 4 and SN 8 to withstand heavy backfill and traffic surcharge.
