Super Free Slope Drain
A precast open drainage element for controlled surface-water movement along slopes, road edges and landscaped infrastructure.
Water begins above the drain
Map the contributing area, design rainfall, overland flow path and inlet points before sizing the channel.
- Catchment boundary
- Design storm input
- Concentration points
- Upstream debris risk
Slope changes hydraulic behaviour
Steeper alignments can produce higher velocity. Capacity, freeboard, surface condition and permissible velocity require project hydraulic review.
- Longitudinal gradient
- Flow depth
- Velocity
- Freeboard
The drain follows the ground
Bedding and anchorage need to remain stable on the slope without creating steps, rocking units or uncontrolled underflow.
- Formation stability
- Continuous support
- Joint alignment
- Anchorage where required
Inlets and outlets are critical
Connect collection points and downstream systems without abrupt geometry that causes bypass, scour or sediment deposition.
- Inlet capture
- Bends and drops
- Downstream connection
- Maintenance access
Finish with erosion control
The outfall may need an apron, stilling arrangement, riprap or other engineered energy dissipation suited to the velocity and receiving ground.
- Outlet condition
- Energy dissipation
- Scour protection
- Safe flow path
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Applications
Where this product is considered.
Application cards describe typical use contexts, not automatic suitability. The project team must confirm geometry, loading, exposure, standards and interfaces for the actual location.
Roadside and embankment slopes
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Cut-slope surface drainage
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Landscape and campus runoff
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Median and verge discharge routes
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Industrial site grade changes
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Outfalls to larger drainage systems
Coordinate the product with adjoining construction, access, drainage, safety and the approved project details.
Design inputs
Information to freeze before manufacture.
A free-slope drain carries runoff down or along sloping ground while keeping the flow path visible and maintainable. Hydraulic demand, velocity, bed stability, inlet collection, outlet erosion and transitions to other drains must be designed as a continuous system. The six inputs alongside form a practical pre-production checklist.
Catchment area and design rainfall
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Longitudinal slope and flow velocity
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Required hydraulic capacity and freeboard
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Bedding, anchorage and slope stability
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Inlet capture and transition geometry
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Outlet energy dissipation and erosion control
Record the requirement on the current approved drawing or schedule and coordinate it with affected disciplines.
Project workflow
From site information to installed unit.
Precast gains programme certainty when survey, design, production, logistics and erection are treated as one connected workflow rather than separate purchases.
Confirm catchment, levels and discharge point
Convert survey and technical inputs into an agreed basis.
Complete hydraulic and erosion review
Freeze the product geometry, interfaces and required checks.
Prepare stable graded alignment and bedding
Complete factory production and documented inspection.
Place units from controlled set-out points
Coordinate safe delivery, lifting, line and level on site.
Connect inlet and protect the final outfall
Close interfaces and retain the required handover records.
System value
Why factory-made geometry matters.
Controlled moulds and curing improve repeatability, while site teams concentrate on preparation, lifting, interfaces and safe completion. Final performance still depends on the complete engineered system.
Open factory-formed flow profile
A catalogue-backed characteristic to evaluate against the project programme, design basis and installation method.
Repeatable modular units
A catalogue-backed characteristic to evaluate against the project programme, design basis and installation method.
Visible route for inspection and cleaning
A catalogue-backed characteristic to evaluate against the project programme, design basis and installation method.
Reduced site shuttering on sloping alignments
A catalogue-backed characteristic to evaluate against the project programme, design basis and installation method.
Frequently asked questions
Super Free Slope Drain technical FAQs.
Twelve practical questions covering selection, engineering, production, handling, installation and documentation.
How is a free-slope drain sized?
Sizing follows catchment, design rainfall, longitudinal slope, roughness, permissible flow depth, freeboard and downstream capacity.
Why is outlet protection important?
Concentrated or high-velocity discharge can erode the receiving ground. The project hydraulic design should provide suitable energy dissipation and scour protection.
Can units be placed directly on soil?
Only where the approved design provides a stable, graded and adequately supported formation. Bedding or anchorage requirements depend on the slope and ground.
How are bends or drops handled?
Use project-specific transition, bend, drop or junction details so flow remains contained and maintainable.
Can dimensions or details be customised?
Project-specific dimensions and interfaces can be reviewed before manufacture, subject to engineering, mould and production feasibility.
What is required for a technical quotation?
Share the latest drawings, quantities, application, levels, loading or hydraulic inputs, site location and required programme.
Is project engineering still required?
Yes. The GLB and catalogue explain the product; they do not replace the consultant-approved structural, geotechnical, hydraulic or electrical design.
Can production and dispatch be phased?
Yes, after the unit schedule and technical scope are frozen, manufacture and dispatch can be coordinated to the agreed workfront sequence.
How are units lifted and stored?
Use only approved lifting points, unit weights, equipment and method statements. Stable dunnage, stack height and ground conditions must be planned.
What quality records can be requested?
Applicable drawings, material records and inspection documentation can be discussed for the confirmed product and project scope.
Can existing infrastructure be connected?
Existing levels, dimensions, utilities and tolerances must be surveyed and incorporated into the approved interface details before manufacture.
Can the 3D model be used as a fabrication drawing?
No. The interactive model is for product understanding. Only the latest approved production and project drawings govern manufacture and installation.
Planning a project with Super Free Slope Drain?
Share the drawings, quantities, site, loading or hydraulic inputs and programme for a product-specific technical discussion.