Rainwater Drainage Pump
Float switch-equipped drainage pumps that automatically discharge rainwater accumulated in basements, parking ramp sumps, and garden pits — with selection recommendations.
Products (1)
Brands: Winpo
What is a rainwater drainage pump used for?
During heavy rainfall, basements, garage and parking ramps, courtyard drains, and low-lying garden areas can fill with water rapidly. Rainwater drainage pumps automatically remove the water collected in a sump at these locations, discharging it to the sewer, a stormwater drain, or the garden. A correctly selected pump reduces the risk of flooding and drains the water before damage occurs to the building.
How to choose
- Flow rate: Determined by the volume of rainwater entering the sump; larger roof and ground areas require a higher flow rate.
- Head: The height of the discharge point relative to the sump and the pipe length must be taken into account.
- Automatic operation: Float switch models ensure the pump runs only when water is present.
- Solids: For sumps where leaves and soil may enter, choose a pump with a wide-passage impeller.
Vertical float switch models take up less space in narrow sumps, making installation easier in small collection chambers.
Installation recommendations
The collection sump must be wide enough for the pump's float switch to move freely. The top of the sump should be covered with a grate to reduce the entry of leaves and debris. A check valve in the discharge line prevents water from flowing back when the pump stops. Testing the pump manually before heavy rain seasons ensures it works when needed. For large areas, a twin-pump system ensures drainage continues even if one pump fails.
Frequently asked questions
Does a rainwater pump work in dirty water?
It is suitable for rainwater containing small amounts of soil and fine particles. For heavy mud or wastewater, dirty water or sewage submersible pumps should be selected.
Does the pump work during a power outage?
It runs on mains power and will stop during an outage. For critical locations, backup via a generator or uninterruptible power supply can be planned.
Where can I find other drainage pumps?
You can browse the drainage submersible pumps category for different flow rate and casing options.
How often should the pump be checked?
Before the rainy season and after major storms, clean the sump, run the pump manually, and test the float switch. Also check that the check valve in the discharge line closes properly.
Where should the pump outlet be connected?
Depending on local regulations, it is connected to a stormwater drain, the garden, or an appropriate discharge point. Check your municipality's rules before discharging rainwater into a wastewater sewer.