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Reduction of discharges: Exploiting the network's storage capacities



Limit CSO spills to the receiving environment and optimise implementation costs for the project owner. 

3D EAU Animation : spill reduction (in French)


1 – Dry weather

2 – Storage (moderate rain)

3 – Storage limit

4 – Spill (heavy rain)

5 – Back to normal

_vanne pivot  principe eaux

1. Installation in CSO chambers - Deomatic gate

The 3D EAU solution

Exploit the storage capacities of existing networks with the help of tilting gates developed and implemented by HYDRASS-3D EAU. 

The water level at which the Deomatic gate opens can be adjusted according to your needs. This allows to store water during low to moderate rainfalls and discharge during heavy rains.


Dry weather 
Gate closed,
no impact on the network


Low or moderate rain
Gate closed,
network storage


Heavy rain
Gate open,
e impact on the network

Example of a tilting gate positioned on the weir in a CSO chamber (in French):

2. Installation in a sewer - Stocko gate

In the absence of a CSO, the Stocko gate makes it possible  to store low to moderate rainfalls in the upstream manifold without limiting its hydraulic capacity for heavy rainfalls.

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Dry weather 
Gate closed, no impact on the network


Low to moderate rain
Gate closed, network storage


Heavy rain
Gate open, neglectable impact on the network

Network managers can test the hydraulic impact of the Deomatic and Stocko gates in their network models (such as SWMM, Infoworks...) using the 3D EAU tool.

In-line storage is an option to be considered in order to decrease discharges in the natural environment.

3DEAU, autosurveillance, modélisation 3D

General methodology

Step 1 - Feasibility study

Taking into account the existing environment of the structure.


Characterisation of the hydraulic behaviour of the future gate to guarantee a good integration in the existing environment.

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Step 2 - Design and implementation

Design, manufacture and assembly in the workshop.

Physical testing on our hydraulics bench.

Step 3 - Delivery

On-site delivery

Assistance with commissioning

Maintenance contract


Strong points

Charte graphique 3D EAU.bmp
  • Less costly than storage tanks

  • Mechanical system with no power requirement

  • Can be integrated into a hydraulic network model

  • Adapted to discharge measurement

  • A non-return valve can be fitted as needed

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