Drainage & Filtration

Confirm the design inputs: soil grading, filtration criteria, flow demand, confining loads, gradient, outlet levels and access for maintenance. The project designer sets the system arrangement and acceptance criteria.

Filter geotextiles, drainage composites and pipes are selected for their function within the drainage system. Cable ducting is not a drainage pipe. Confirm the exact product’s filtration, flow and structural data against the design.

Confirm interfaces, joints, connections and transitions on the drawings. Adjacent products must be compatible with the selected system; proposed substitutions require designer approval.

Use current manufacturer data for the exact grade and the relevant service conditions. Generic thicknesses, tensile ratings or service-life claims do not establish suitability for every project.

Before installation, confirm the product and grade, accept the work area and inspect delivered material. Establish storage, handling, layout and protection requirements using the approved method and manufacturer guidance.

Inspect the filter product, joints, connections, pipe or core orientation, bedding and outlet levels before covering. Verify continuity to the designed discharge point. Flow or other acceptance testing follows the agreed specification.

Record installation checks, test results where required, repairs and hold-point releases. Protect completed work until acceptance and compile the agreed traceability and handover records.

Sequence installation, covering and site access so completed work is protected. Changes to the agreed method or product are reviewed with the responsible designer and project team.