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Yard Drainage

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Most yard drainage problems are levels problems wearing a disguise. A homeowner sees standing water and assumes the answer is a pipe, so a contractor sells a pipe, and the water keeps arriving because nothing changed about where the ground sends it. The fix in a great many Australian backyards is not more drainage but different finished levels.

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The building rules say as much. The ABCB Housing Provisions on earthworks require that where filling is carried out, surface water is diverted away from any existing structure on the property and on adjoining allotments. Levels, in other words, are treated as the primary control on surface water, and the pipework is what deals with the water once the ground has directed it somewhere useful. Filling also has to be placed and mechanically compacted in layers of not more than a hundred and fifty millimetres, which is why loosely backfilled trenches and garden beds settle into new low points a season later.

The distinction that makes yard drainage diagnosable is timing. Water that appears during rain and disappears soon after is surface water, and it is a levels and grading problem. Water that appears hours or days after rain, or never quite leaves, is subsurface water moving through the soil, and it needs interception. Treat the first with pipe and the second with grading and you will have paid for a system that solves neither.

Reading the symptoms before anyone quotes

  • Water standing during the storm and gone within the hour: a surface and levels problem.
  • Ground still soft and squelching days later: subsurface water, which pipe on the surface will not touch.
  • A lawn that dies in the same patch every wet season: water sitting in a hollow with nowhere to go.
  • Silt fanned out across a path or lawn: overland flow crossing your yard from somewhere upslope.
  • Damp at the base of a wall, or efflorescence on brickwork: ground levels too high or falls running the wrong way.
  • Mossy, permanently shaded ground: as often a sunlight and evaporation problem as a drainage one.
  • Water only in one corner after the neighbour's renovation: the catchment reaching your yard has changed.

The tools available, and what each one is actually for

  • Regrading and reshaping the ground, which is the first and cheapest option and the one most often skipped.
  • Spoon drains and shallow swales, which carry surface water across a yard without a trench.
  • Channel and strip drains, which intercept sheet flow at a threshold, a garage apron or the bottom of a driveway.
  • Surface pits and grates, which collect water at a low point once it has been directed there.
  • Subsoil or agricultural drains, a perforated pipe in aggregate with a filter fabric, which intercept water moving through the soil.
  • Absorption and detention systems, which hold or soak water where it cannot simply be piped away.
  • Retaining and level changes, which are sometimes the only way to give the water somewhere to go on a tight site.

How a drainage job should be diagnosed and built

  • Watch the yard during actual rain, or have the contractor do it, rather than inferring from a dry-day inspection.
  • Take levels across the problem area so the falls are known rather than eyeballed.
  • Identify where the catchment starts, including roof water, neighbouring land and paved areas.
  • Confirm where the water is allowed to be discharged before any trench is dug.
  • Set finished levels first, and design the pipework to suit them rather than the other way around.
  • Compact all backfill in layers, since a loose trench becomes the next low point.
  • Test the completed system with a hose or, better, watch it work through the first real storm.

Where the water is not allowed to go

The ABCB Housing Provisions require that surface water be diverted away from existing structures on the property and on adjoining allotments, and that is the principle that governs the whole subject. Solving your drainage by sending water over the boundary is not a solution, it is a transfer of the problem, and it is the single most common cause of neighbour disputes arising out of landscaping work.

In practice that means three things. Do not regrade a yard so water runs towards a neighbour's fence or building. Do not discharge a subsoil drain at the boundary and leave it. And do not increase the hard surface area of a block without asking what the extra run-off does downstream, because paving converts absorbent ground into a surface that sheds everything that lands on it.

Why drainage work fails to fix the problem

  • The wrong diagnosis: a subsoil drain installed where the water was never going into the ground in the first place.
  • A pit installed at a point that is not the low point, so water never reaches it.
  • Inconsistent falls in the pipe, leaving sections where water stands and silt accumulates.
  • No silt pit or no access, so the system cannot be cleaned and blocks permanently within a few years.
  • Aggregate laid without a filter fabric, so fines wash in and the drain silts up from the inside.
  • Backfill dumped rather than compacted in layers, so the trench line becomes a new depression.
  • The outlet placed where it discharges against a structure or onto adjoining land.

Keeping a yard drainage system working

  • Clear grates and surface inlets of leaf litter before the wet season, not during it.
  • Open and clean silt pits on a schedule, since that is what they exist for.
  • Watch the outlet during heavy rain to confirm water is actually leaving the system.
  • Keep mulch and garden beds from building up over strip drains and grates until they are buried.
  • Watch for new low points as backfill and garden soil settle, and top them up before they hold water.
  • Reassess after any building work on your block or next door, because the catchment will have changed.

Yard Drainage: frequently asked questions

How do I tell whether I need grading or a subsoil drain?

By when the water appears. If it arrives during rain and drains away soon after, it is surface water and the answer is finished levels, falls and surface collection. If the ground stays soft for days, or dampness shows up well after the rain stopped, the water is moving through the soil and needs interception by a subsoil drain. Installing the wrong one is the most common way people spend money on drainage and see no change.

Can I send my yard's water onto the neighbour's land?

No. The ABCB Housing Provisions require surface water to be diverted away from existing structures on your property and on adjoining allotments, and the practical and legal expectation everywhere in Australia is that you do not solve your drainage by transferring it over a boundary. Where the water goes needs to be established before a design is drawn, not discovered when the neighbour's shed floods.

Why does the ground keep sinking where the drain was installed?

Because the trench was backfilled loosely. The Housing Provisions require filling to be placed and mechanically compacted in layers of not more than a hundred and fifty millimetres, and a trench filled in one go with loose spoil will consolidate over the following seasons. The result is a shallow trough directly over the pipe, which then collects the very water the drain was meant to remove. It is a workmanship issue, not a design one.

Will drainage fix a damp wall on my house?

Sometimes, if the cause is ground levels too high against the wall or water running towards the building. Lowering the finished ground, getting the falls away from the structure and taking roof water to a proper discharge point often resolves it. Where the dampness comes from a failed damp-proof course, a leaking pipe or rising damp, drainage will not touch it, and the honest contractor will say so before quoting for a trench.

How much fall does a yard need?

Enough that water always has somewhere to go and never has a low point to sit in, which is a design question for the specific site rather than a single number. What matters more than the figure is consistency: a continuous fall towards a collection point works, while a yard that falls, flattens and falls again will hold water at every flat spot. Ask for levels to be taken and finished levels to be nominated, rather than accepting a visual assessment.

Sources

  1. NCC: ABCB Housing Provisions Part 3.2 Earthworks, filling and surface water diversion
  2. NSW Planning Portal: Exempt development

Written by the LokalMatch editorial team. Last reviewed 22 September 2026. How we write and check our guides

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What affects the cost of yard drainage

Prices depend on the details of your project. We only publish price ranges when they’re backed by real LokalMatch quote data or reliable sources. Until then, here’s what usually changes the price:

  • Size of the yard and the scope of the design
  • Grading, excavation and drainage work
  • Hardscape materials, such as stone, pavers or wood
  • Plants, sod and soil
  • Access for machinery
  • Removal of old materials, trees or stumps
  • How often visits are scheduled for ongoing services

How to compare drainage contractors before you hire

  • Choose a company that does the kind of work you need, since design, lawn care, tree work and hardscaping are different specialties.
  • For big projects, ask for a site plan or drawing before work starts.
  • Ask how they'll handle grading and drainage so water moves away from the house.
  • For tree removal or large pruning, look for a qualified arborist with liability insurance.
  • For ongoing services like lawn care or snow removal, get the visit schedule and what's included in writing.

Questions to ask drainage contractors before you hire

  • Can I see a plan or drawing before you start?
  • How will you handle drainage and grading?
  • Will you have underground utilities located before you dig?
  • Does any of this work need a permit, such as for a retaining wall, fence or tree removal?
  • What plants or materials do you recommend for our climate and my yard's sun and shade?
  • Do you guarantee plants or sod, and for what conditions?
  • Can you show me proof of liability insurance?

When to call a pro for yard drainage

  • Water that pools near the house or in the yard after rain
  • A tree that is leaning, cracked or has large dead branches over the house or a driveway
  • A retaining wall that is bulging, leaning or cracking

Yard drainage permits and local rules

Some yard drainage work needs a permit or has to meet local bylaws. Rules vary by municipality, so ask your pro whether a permit is needed and who will apply for it — and check with your city or town if you’re unsure.

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