Detention cistern for rainwater detention and sewer relief
- A detention cistern retains the rainwater and drains it into the sewer at a delayed speed.
- GRAF cistern for rainwater detention and sewer relief.
- To guarantee retention of rainwater, a delayed drain is fitted in the sewer with a delay of 0.05 to 16 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 sewer at a delayed speed using a floating drain choke. This relieves the sewer and the treatment works. The water level can rise to the emergency overflow and sink slowly back down again after the rain.
- Sizes between 1,500 – 7,500 l with corresponding retention volumes are possible.
- We also construct and supply individual, special solutions.
Advantages
Thought-out in every detail
Low installation depth
Low installation depth
The minimal installation depth saves you time and money during installation.
Low weight
Low weight
Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.
Low installation depth
The minimal installation depth saves you time and money during installation.
Low weight
Tank installation made easy! The significantly lower weight of GRAF products compared to steel or concrete cisterns makes transport and installation easier.
Sizing
| Volume [l] | Length [mm] | Width [mm] | Height [mm] | Weight [kg] | order no. | add to enquiry |
|---|---|---|---|---|---|---|
| 7500 | 3600 | 2250 | 1565 | 360 | 390305 | |
| 5000 | 2890 | 2300 | 1315 | 240 | 390302 | |
| 3000 | 2450 | 2100 | 1050 | 170 | 390301 | |
| 1500 | 2100 | 1250 | 1015 | 80 | 390300 |
calculated size Request for information
Technical details
Accessibility
Earth covering with loading capacity [mm]
700 - 1000
max. axle load [t]
2.2
max. vehicle weight [t]
3.5
max. vehicle weight with reinforced concrete slab [t]
60
Groundwater installation
Earth covering with groundwater installation [mm]
700 - 1200
