Storm drain lift stations pump rainwater from low areas where gravity drainage cannot move runoff to the required discharge point. These systems are commonly used in underground parking structures, loading areas, commercial properties, below-grade courtyards, and other locations where drains sit lower than the municipal storm system.
Because the system depends on pumps, controls, and power, routine inspection is important. A failed storm-water lift station may not be noticed until heavy rain causes rapid flooding.
How a Storm Drain Lift Station Works
Rainwater enters a collection basin or sump. When the water reaches a predetermined level, floats or sensors activate one or more pumps.
The pumps move water through discharge piping to a higher drainage point.
Typical components include:
- Storm-water pumps
- Floats or level sensors
- Check valves
- Isolation valves
- Control panels
- High-water alarms
- Discharge piping
- Collection basins
