Otto Graf GmbH
Plastic Products
Tel. +49 7641 589-0
Fax +49 7641 589-50
export@graf.info
www.graf-water.com
Carl-Zeiss-Straße 2-6
DE-79331 Teningen, Germany

Carat S retention cistern

The GRAF Retention cistern combines rain retention with rainwater harvesting.


Sizing form/
Tender file
Carat S retention cistern

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 and the retention or harvest volumes. In the event of heavy rainfall, the water level in the cistern rises above the max. water level (short term) 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. This rainwater can then be harvested.

We also construct and supply individual, special solutions.
Sizes between 3,750 – 100,000 l with corresponding retention volumes are possible.

This special type of rainwater harvesting is prescribed or subsidised in many communities. 

  • For rainwater retention
  • For rainwater harvesting in the house and garden
  • For frost-proof installation in the ground
  • The entire tank volume can be used for rainwater retention
  • "USA Patent 7854338"

3,750 l

order no.Length (mm)Width (mm)Height (mm)Inner Ø dome shaft (mm)add to enquiry
370519228017552200650
Total volume (l)Retention volume (l)Useable volume (l)
375015002250

4,800 l

order no.Length (mm)Width (mm)Height (mm)Inner Ø dome shaft (mm)add to enquiry
370520228019852430650
Weight (kg)Total volume (l)Retention volume (l)Useable volume (l)
185480020002800

6,500 l

order no.Length (mm)Width (mm)Height (mm)Inner Ø dome shaft (mm)add to enquiry
370521239021902710650
Weight (kg)Total volume (l)Retention volume (l)Useable volume (l)
220650030003500

Technical details

max. earth covering (mm) (without groundwater, vehicle loading)max. axle load (t)max. vehicle weight (t)
200083,5 / 12
Earth covering with loading capacity (mm)Earth covering with groundwater installation (mm)
800 - 2000800 - 1800

Enquiry (0)


https://www.graf-water.com/retention/retention-cisterns/carat-s-retention-cistern.html

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