Pump Stations for Basement Car Parks: What to Buy and What It Costs
With basement car park drainage, the ramp is the problem. It always is.
A basement carpark drainage pump should almost always be a dual station: two pumps, a control panel and a high level alarm, so one failure does not flood the cars. For most small to mid sized basements, that means a Kwikflo Dual Stormwater Pump Station, which runs from $5,296.78 to $8,794.20 depending on tank and pump. One pump in a pit is fine for a house. It is a bad bet under somebody else's BMW.
The tank size and pump come from one number: how much water reaches the low point in a storm. That is a job for the hydraulic designer, but the sums below show what drives it.
Short on time? See the Kwikflo dual stormwater stations, browse packaged pump stations, or send us your drawings for a supply quote.
Best pump stations for basement car parks
The Kwikflo dual 1200L with AL1500 pumps is our starting point for a typical apartment or small commercial basement, at $7,093.07. It gives more storage than the 900L and more pump than the 240V model. The other options suit smaller or larger catchments. Prices are current as of November 2026.
| Station | Pumps | Power | Best for | Price |
|---|---|---|---|---|
| Kwikflo Dual 900L | 2 x AL750 drainage | 240V | Small basements without three phase power | $5,296.78 |
| Kwikflo Dual 900L | 2 x AL1500 drainage | 415V | Small tank footprint, higher head | $6,260.65 |
| Kwikflo Dual 1200L | 2 x AL1500 drainage | 415V | Typical apartment or small commercial basement | $7,093.07 |
| Kwikflo Dual 2000L | 2 x AL1500 drainage | 415V | Larger ramps, more storage | $8,794.20 |
| Kwikflo 1200L Stormwater, single pump | 1 x AL1500-1A | 240V | Private garage where a failure hurts nobody else | $5,199 |
Prices current as of November 2026, AUD including GST. Freight is quoted per project.
Each dual package comes pre-assembled with two pumps in duty and standby, a control panel and float set, ball and non-return valves, barrel unions, PVC pipework and a poly lid. Class B and Class D cover options are available. The site work is connecting the inlet, the discharge and the power.
Why a basement car park needs two pumps
A basement car park needs two pumps because the water keeps coming when a pump fails, and it usually fails at the worst time. Storms bring the peak inflow, debris and tripped circuits together. With duty and standby, the second pump takes over or joins in when the level keeps rising.
The panel alternates the pumps, so both stay exercised and a seized standby does not surprise you in February. Our dual pump station guide explains when a backup is genuinely worth paying for. In a shared basement, it nearly always is.
How much water a car park ramp collects
A car park ramp collects roughly 1.7 L/min for every square metre of ramp at a rainfall intensity of 100 mm an hour. The sum is simple: 100 mm an hour on 1 square metre is 100 litres an hour. Sealed concrete sheds nearly all of it.
| Ramp and open area | At 100 mm/h | At 200 mm/h |
|---|---|---|
| 30 m² | 50 L/min | 100 L/min |
| 60 m² | 100 L/min | 200 L/min |
| 120 m² | 200 L/min | 400 L/min |
Those intensities are examples only, not design values. The design storm depends on your location and the consent conditions, and the designer sets it. Short, intense bursts are what catch basements out, which is why storage matters as well as pump size.
Add any other inflow to that figure: subsoil seepage through the walls, fire sprinkler test water, and hose down water. Then check the flow at your actual head. Maximum figures do not help. The AL1500-1A in the Kwikflo stormwater packages lists 500 L/min maximum flow and 17 metres maximum head, and it does not deliver both at once. Our guide to calculating head height covers the sum, and stormwater pit sizing covers storage.
Keep ramp water and sewage in separate stations
Ramp stormwater and basement sewage belong in separate pump stations, because they discharge to different systems. Stormwater generally goes to the stormwater system. Toilets and basement bathrooms go to sewer through a station with a cutter or grinder pump. Do not assume the same pit can take both, even though the tanks look identical.
For the sewage side, see the Kwikflo dual sewer pump station and our stormwater vs sewer guide. Car wash bays and floor wastes can be a third case. Oily water may need trade waste consent and an oil water separator before it goes anywhere, and your licensed plumber confirms that with the local authority.
What happens in a blackout
A basement car park pump station stops in a blackout unless it has backup power, and tank storage is all that stands between the rain and the cars. Summer storms take the grid down at exactly the wrong moment, so raise it early with the designer. The options are more storage, a generator connection, or a backup supply, and we quote those per project.
At the very least, the high level alarm should reach a person. A strobe in an empty basement at 2am tells nobody anything. Our pump station alarm guide explains what each alarm means.
Mistakes we see on basement jobs
The most expensive basement mistake is sizing the pump on the floor area instead of the ramp and open catchment. A covered floor collects almost no rain. A short open ramp collects plenty.
- A grate that is too small. The ramp grate must catch the water, or it runs straight past into the bays.
- No silt plan. Car parks shed grit, leaves and rubbish. Keep a strainer or pit that can be cleaned, and service it.
- A lid rated for the wrong traffic. A pit in a trafficable bay needs the right access cover class, not the poly lid from the box.
- Forgetting the discharge. The rising main must loop above the flood level where the designer requires it, and needs a working non-return valve.
For a single car garage or a house, this is overkill. A REEFE stormwater pit and pump from $799 handles light residential drainage. It is not built for a shared basement.
Frequently asked questions
What pump do I need for a basement car park in Australia?
A basement car park usually needs a dual stormwater pump station with two drainage pumps, a control panel and a high level alarm. Kwikflo dual stormwater stations run from $5,296.78 to $8,794.20 as of November 2026. The final size comes from the hydraulic design.
How much does a basement car park pump station cost?
A packaged dual pump station for a basement car park costs about $5,300 to $8,800 for the equipment in Australia, as of November 2026. Excavation, plumbing, electrical work, covers and freight are extra, and they often cost more than the station.
Do basement car parks need a backup pump?
Yes, a shared basement car park should have a backup pump, because a single failure during a storm can flood every vehicle. Your hydraulic designer, consent conditions and local authority set the actual requirement for the site.
Can a basement car park drain to sewer?
Rainwater from a car park ramp generally should not go to sewer, and water authorities restrict this. Floor wastes and wash bays can be treated differently and may need trade waste consent. Ask your licensed plumber to confirm with the local water authority.
How often should a car park pump station be serviced?
A car park pump station should be inspected on a regular schedule, and the pit cleaned of silt and rubbish before storm season. Test both pumps, the floats and the alarm at each visit. Our maintenance schedule is a good starting point.
Need a basement car park station priced?
Send us the plans, the ramp and open area, the depth, the discharge point and your power supply, and we will return a supply quote, usually within 24 to 48 hours. Send us your drawings, contact us here, or call 1300 930 847. For a quick first pass, try the pump station sizing calculator.
This guide is general information for Australian conditions and is not a substitute for advice from a hydraulic designer or licensed plumber. Pump station installation is regulated work, and requirements differ between states, councils and water authorities. Flow figures are worked examples, not design values. Electrical work must be done by a licensed electrician.