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.
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
