Why is my Farnborough garden always waterlogged?

Usually heavy clay subsoil that water cannot pass through, often combined with compaction and no lower point for water to escape to. Land drains to a properly sized soakaway are the normal remedy.

How big does a soakaway need to be on clay?

Larger than most people expect. Sizing depends on the area of hard surface draining into it and how quickly the subsoil accepts water, which we establish with a percolation test rather than a guess.

Can I drain my new driveway into the road?

No. Surface water from a private driveway must be managed within your own boundary, either through a permeable surface or a soakaway. We design every drive to comply.

Do you fix patios that flood or hold water?

Yes. We re-set the falls across the affected area and add a channel or slot drain where the water needs to leave, then take it to a soakaway or existing drainage.

Is drainage included in your driveway and patio quotes?

Always. Drainage is designed as part of the build and priced in the written quote, not raised as an extra once the ground is open.

Landscaping

Garden Drainage in Farnborough

Waterlogged lawns, puddled paving and water running towards the house — solved by working out where the water comes from and where it can legally go.

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Farnborough's ground is not consistent. Much of the town sits on free-draining Bagshot sands and gravels, but London Clay comes close to the surface in the lower ground around Cove Brook and parts of North Camp, and made ground is common near the older airfield estates. That mix is why one garden drains in an hour and the one two streets away holds water for days — and why we test rather than assume before designing any drainage.

Diagnosing the problem first

Before specifying anything we establish three things: where the water is coming from, what the subsoil will actually accept, and where the water is allowed to go. A percolation test on clay often shows that a soakaway needs to be considerably larger and deeper than a standard detail assumes.

Sometimes the answer is not a drain at all. Water running off a neighbouring roof, a blocked existing gully or a patio laid falling towards the house each need a different fix, and none of them is solved by digging a trench in the lawn.

Channel drainage installed with block paving in Farnborough, Hampshire

What we install

The right solution is usually a combination of two or three of these, sized to the area of hard surface draining into them.

Linear channel and slot drains across thresholds, garages and patio edges
Perforated land drains in gravel-filled trenches to dry out waterlogged lawns
Soakaway crates and rubble soakaways sized and sited to the subsoil
Gullies and connections into existing surface water drainage
Permeable paving build-ups that store and release water through the sub-base
Re-set falls and levels on paving that currently holds water

Waterlogged lawns

A lawn that squelches all winter usually has compacted subsoil, an impermeable clay layer, or nowhere lower for water to reach. Land drains in gravel trenches, laid to a fall and connected to a soakaway or existing outfall, are the standard remedy — often combined with deep aeration and a sand-rich topdressing.

Where a lawn sits in a genuine hollow with no outfall available, a rebuild of levels or a change to a free-draining surface may be more honest than a drain that has nowhere to discharge.

Drainage and new driveways

Rules on front garden surfacing mean a new impermeable driveway must either drain within your own boundary or have planning consent. We design that in as standard — permeable resin or block systems, or a channel drain to a properly sized soakaway.

Discharging surface water onto the highway or into a neighbour's garden is not an option we will design, however tempting it is as a shortcut.

Protecting the house

The most important drainage detail on any project is the one closest to the building. Paving must sit below the damp proof course, fall away from the wall, and where levels make that impossible, a slot or channel drain must take the water away.

We also check downpipes and gullies while we are on site. A cracked shoe or a gully discharging under a patio does more damage than any amount of surface water.

Recent work