Flat topography across Peterborough and the surrounding Fenland means surface water has limited natural fall. Heavy clay soils compound the problem by holding water rather than absorbing it. The result is soft, uneven ground that makes turf fail and paving sink. A site survey checks ground levels, soil condition, and where water is coming from before any drainage solution is specified, the fix depends on the cause, not a standard package.
French drains are the most common solution for gardens with a consistent low point to drain towards. A trench is excavated, a perforated pipe is laid in a gravel surround, and the trench is backfilled to the surface. Where no suitable outfall exists, a soakaway, a rubble-filled pit at sufficient depth to reach free-draining subsoil, disperses water into the ground. Inspection chambers are included where the drain run needs access for future maintenance.
Ground levelling and grading follow drainage installation. Subsoil is excavated and compacted, topsoil is reinstated to the correct finished level, and the surface is graded to direct any residual runoff away from the house and towards the drainage point. Getting this stage right before paving or turf is laid is the reason a finished garden stays stable, skipping it means the surface work has to be lifted and redone when the drainage problem reappears.