Managing runoff from Brisbane roofs, driveways, courtyards and landscaped areas.
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A stormwater pit collects surface runoff and directs it into underground drainage. When the pit is blocked, damaged, poorly positioned or connected to a failed pipe, water can pool across paving, overflow near the home or erode the surrounding ground.
We inspect stormwater pits as part of the complete drainage path—from the incoming surface water and downpipes to the outlet pipe and accessible discharge arrangement.
Call us on 1300 453 873
Blocked and overflowing pit clearing
Cracked or sunken pit repairs
New stormwater pit installation
Stormwater pipe camera inspections
High-pressure drain cleaning
Downpipe and surface drain connections
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A stormwater pit is an accessible collection or junction point in a rainwater drainage system. A grated inlet can capture runoff from the ground surface, while side entries may receive pipes from downpipes, channel drains or other pits. The outlet carries water into the downstream stormwater line.
Many pits include a sump below the outlet. Heavier sediment can settle in this lower section instead of immediately entering the pipe. This makes the pit easier to inspect and clean, but the accumulated silt must be removed before it reaches outlet level.
Pits can be positioned at low points where runoff naturally concentrates, but location alone does not guarantee effective drainage. Surface levels, grate height, catchment area, pipe fall, outlet depth and the downstream discharge path all affect performance.
| Location or purpose | What the pit may receive |
|---|---|
| Driveways and paved areas | Surface runoff directly through a grate or from a connected channel drain. |
| Courtyards and patios | Rain falling within enclosed outdoor areas where surface falls direct water to the inlet. |
| Yards and landscaping | Ground runoff, with consideration for sediment, mulch, leaves and surrounding finished levels. |
| Downpipe networks | Roof water from one or more downpipes entering a junction or collection pit. |
| Pipe junctions | Multiple stormwater lines joining or changing direction at an accessible point. |
Stormwater pits are available in different sizes, materials and inlet arrangements. The selected unit must suit its purpose, incoming pipe levels, outlet size, expected runoff and installation environment. A shallow domestic surface-water pit is not interchangeable with every junction or high-flow application.
The grate or lid must also suit its location. Pedestrian areas need a secure cover appropriate for foot traffic, while pits installed where vehicles may pass require components designed and supported for the applicable loads. A cracked, loose or unsuitable cover is both a drainage and safety concern.
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The visible pit may be the collection point, while the actual fault sits in the connected pipework or surrounding ground.
Surface debris can cover the grate or build up inside the sump until it reaches the outlet and begins entering the downstream pipe.
Silt, roots, debris or pipe damage downstream can stop water leaving even after the pit itself has been emptied.
Ground movement, poor support, impact or unsuitable loading can damage the walls, base or cover and allow surrounding soil to wash in.
A grate above the surrounding low point may not capture runoff. A pit set too low can collect excess sediment and create a trip hazard.
Incorrect levels, settlement or deformation can leave water sitting in the line and reduce the system’s ability to drain by gravity.
A full or restricted downstream system can push water back into the pit during heavy rain, even when the grate and sump are clean.
Emptying leaves from the top is useful maintenance, but recurring overflow needs a system-level assessment. We start with the pit, inlet and outlet, then follow the connected drainage where access and conditions allow.
We examine the grate, finished levels, sediment depth, pipe entries, outlet and visible damage. The surrounding flow path can show whether runoff reaches the pit or bypasses it.
Controlled testing can help show whether water leaves the pit, backs up from downstream or escapes through damaged components. Testing is adapted to site conditions and current weather.
When access permits, a camera can identify roots, displaced joints, cracks, deformation, debris and sections holding water. The camera shows internal condition but does not by itself calculate the capacity of the complete catchment.
Jetting can remove suitable silt, roots and debris from stormwater pipework. If the line is broken, collapsed or incorrectly graded, clearing may restore some flow without fixing the structural cause.
A repair may be appropriate for an isolated pipe penetration, connection, grate or localised surrounding issue when the body of the pit remains sound. Replacement may be more reliable when the pit is badly cracked, deformed, sinking, undersized for its role or fitted with an unsuitable cover.
The repair scope may also extend beyond the pit. A damaged outlet line, poor pipe fall, inadequate surface grading or failed downstream stormwater drain will continue to affect performance if only the collection box is replaced.
New pits can improve capture at a genuine low point, provide access at a pipe junction or receive a channel drain or downpipe network. Before installation, the intended catchment, finished surface levels, available pipe fall, underground services and approved discharge arrangement need consideration.
Depending on the property and extent of work, drainage design, council requirements, approvals, excavation, concrete or paving reinstatement and coordination with other trades may be required. We assess the plumbing scope and explain what is included before work begins.
Inspect grates and accessible pits before Brisbane’s wetter periods and after significant landscaping or building work. Remove loose surface debris and sump sediment safely before it reaches the outlet. Do not enter a pit or confined drainage space.
Arrange professional attention when the pit repeatedly fills above outlet level, overflows in ordinary rain, has a damaged lid, shows soil washing into it or appears to be sinking. Recurring blockages are a reason to inspect the connected pipe rather than repeatedly removing only the visible debris.
It is an accessible chamber that collects rainwater runoff, receives stormwater pipes or joins drainage lines before water continues through an outlet pipe.
Some pits have a sump below the outlet that intentionally retains some water and sediment. Water remaining above the outlet or backing up after rain can indicate a drainage problem.
Possible causes include a covered grate, full sump, blocked outlet, roots, broken pipe, poor fall, downstream surcharge, insufficient drainage capacity or more runoff reaching the pit than the system can convey.
Yes. We can remove accessible debris and assess the outlet and connected pipework. CCTV inspection or high-pressure jetting may be recommended when the blockage extends downstream.
Yes, subject to site assessment, available fall, underground services, access and the approved discharge arrangement. Larger drainage changes may require design or approvals.
Size depends on the pit’s purpose, incoming pipes, outlet, catchment, expected flow, sediment load, installation depth and access requirements. There is no single suitable size for every property.
A pit located where vehicles can load it needs a cover, frame and installation appropriate for that use. A light pedestrian grate should not be assumed suitable for a driveway.
Open penetrations, cracked walls, poor surrounds, erosion or ground movement can allow soil to enter. The source of the washout should be addressed, not only the sediment removed.
Roots more often enter damaged joints or cracks in the connected pipework, then trap debris and cause water to back up into the pit. A camera inspection can help locate root intrusion.
Stormwater and sanitary drainage are separate systems. A suspected cross-connection, sewage odour or wastewater entering a stormwater pit requires prompt professional investigation.
Yes. We service Brisbane City and surrounding northside, southside, eastern and western suburbs, subject to access and availability.
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49 Montpelier Rd
Bowen Hills, QLD 4006
14/475 Scottsdale Drive
Varsity Lakes QLD 4227
Suite 10&11, 81 Brisbane St
Ipswich, QLD 4305
Phone: 1300 453 873
Email: customerservice@jetsetplumbing.com.au
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