GRAF detention cisterns for rain detention and channel relief
To guarantee retention of rainwater, a delayed drain is fitted in the channel with 0.05 to 2.0 l/sec. depending on the customer’s specifications. In the event of heavy rainfall, the water level in the cistern rises above this level and is drained into the channel at delayed speed using a floating drain choke. This relieves the channel and the treatment works.
The water level can rise to the emergency overflow and sinks slowly back down again after the rain to the long-term max. water level.
We also construct and supply individual, special solutions.
Sizes between 2,500 – 100,000 l with corresponding retention volumes are possible.
- To retain rainwater and relieve the sewers
- For frost-proof installation in the ground
- "USA Patent 7854338"
|Volume [l]||Length [mm]||Width [mm]||Height [mm]||Weight [kg]||Retention volume [l]||order no.||add to enquiry|
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Mini telescopic dome shaft with lid, suitable for pedestrian loading
order no.: 371010
Maxi telescopic dome shaft with lid, suitable for pedestrian loading
order no.: 371011
Telescopic dome shaft with cast iron lid, suitable for vehicle loading
order no.: 371020
Telescopic dome shaft TRUCK
order no.: 371021
Telescopic dome shaft TRUCK for concrete rings
order no.: 371003
Choke drain package detention/retention
order no.: 369020
For underground tank Carat 0,05 - 2,0 l/s, DN 100 connection, 3 m hose