20

Catalogue EN 4.1

KESSEL AG

Everything specialists

need to know

What is backwater and what criteria must

be noted for the correct product choice?

Backwater level

Backwater level

Water drainage system without backwater protection

During heavy rain, the water level rises above the

so-called backwater level. This term is usually used

to mean street level. Rooms in the basement or cellar

quickly become flooded. The results are significant

damage and costs.

Water drainage system with backwater protection

Wastewater that flows with a slope to the sewer will

be protected by a backwater valve. In the event of

backwater, the flap closes so that no wastewater can

enter the building. If the public sewer is higher than

the drainage spot in the building, the wastewater

must be pumped above the backwater level, for

example via an Aqualift lifting station from KESSEL.