The Functional Principle

Phase I — Dry weather
In dry weather the storm tank is empty.

Phase II — Stormwater
When it rains the circular attenuation tank is filled. The float which is positioned in the receiving sump signals the flushing unit to lock the closure mechanism of the reservoir. The flushing container is filled via the flap valve proportionate to the water level in the attenuation tank. Even with partial filling there is enough flushing water
in the container to provide a reasonable cleaning wave.
Alternatively the storm tank fills to a level that fully charges the reservoir.

Phase III — After stormwater
After a storm event the tank empties, leaving the flushing water retained in the reservoir container. The sloping wall of the reservoir creates an upward force due to the shape of the outer wall. When the flushing sump is emptied, the float falls and unlocks the reservoir container.

Phase IV — Flushing
Once unlocked, the force of water against the outer reservoir wall raises the whole container upwards releasing the water in a powerful flushing wave. The water flows over the whole tank floor re-mobilising the settled debris and transports it to the receiving sump leaving the floor clean.

The Advantages

• automatic filling, even with partial inflow
• float technology with no external power so no operating costs 
• electro-hydraulic control optional
• optimal cleaning results even with heavier deposits
• no additional con-struction technology necessary
• durable
• manual flushing possible
• flexible fitting

Cost effectivenes

• very inexpensive
• operation without external power 
• retrofit possible –
• even through small manholes
• low maintenance
• operationally safe