Groundwater rises
Water pressure builds up beneath the sealed basin. Without relief, this pressure can lift the geomembrane.
ENIG in-house development
Reliably relieving groundwater pressure.
An automatically operating solution that protects membrane-lined basins from damage caused by rising groundwater.
The Problem
Pressure from below threatens the sealing system.
If the groundwater rises beneath an empty or only partially filled retention basin, it pushes against the geomembrane from below. The membrane can bulge, shift, or be damaged at connection points.
The groundwater pressure relief valve developed by ENIG solves this problem directly at the sealing layer. It reacts automatically to the pressure difference and relieves the structure only when necessary.
Step by step
How pressure relief works.
The valve opens
As soon as the pressure reaches the specified opening value, the valve body lifts automatically—entirely without power or control systems.
Pressure is relieved
Water can enter the basin in a controlled manner. This equalizes the pressure conditions, and the sealing system remains protected.
Secure closing
When the external pressure drops, the valve closes under its own weight. Basin water cannot flow back into the subsoil in an uncontrolled manner.
Applications
For sealed basins and structures.
Retention and stormwater basins
Firefighting water basins
Industrial and WHG-compliant facilities
New construction and suitable retrofitting
Advantages
Simple principle. Lasting safety.
- Automatic function without external power supply
- Protection against uplift and mechanical damage to the geomembrane
- Non-return principle prevents uncontrolled backflow
- Robust and low-maintenance design
- Planning, fabrication, and professional installation from a single source
In-house development by ENIG GmbH