The GRAF Retention cistern combines rain retention with rainwater harvesting.

 

 

The GRAF retention cistern is a combination of rainwater retention and rainwater harvesting. The detention can be larger if required. In this case, part of the rainwater can also be used in addition to the required detention volume. For example, rainwater can be used for the following applications:

• Watering gardens

• Flushing toilets

• Washing machines

• Cleaning

The use of rainwater means that up to 50 % of drinking water can be saved, and up to 85 % for commercial properties.

The retention cistern is designed such that the rainwater first fills the useage volume. When the useful volume is full, the throttled outflow is activated and the detention volume also becomes available for temporary storage. The detention mechanism with throttled outflow in turn corresponds to a conventional retention system. Following the rainfall event, the position of the outflow prevents the detention cistern from being completely emptied, while the useage volume remains in the tank!

 

 

 

Advantages Carat XXL retention cistern:

  • Suitable for HGV loading up to 40 t
  • Can be mounted in groundwater
  • Dome opening with stainless steel profile for precision fit and secure mounting
  • Lower weight than concrete and steel
  • Various connection surfaces DN 100 (4")/150 (6")/200 (8")
  • Available with DN 300 (12") connection as an option
  • Available with a second tank dome as an option
  • 102,000 l Volume possible
  • Investment security thanks to a 15 year warranty

Sizing

Volume [l]Length [mm]Width [mm]Height [mm]Weight [kg]order no.add to enquiry
12200028600250031604900380541
11600027330250031604610380540
11200026360250031604510380539
10600025090250031604220380538
10200024120250031604120380537
9600022850250031603830380536
9200021880250031603730380535
8600020610250031603440380534
8200019640250031603330380533
7600018370250031603040380532
7200017400250025502940380531
6600016130250031602650380530
6200015160250031602550380529
5600013890250031602260380528
5200012920250031602160380527
4600011650250031601870380526
4200010680250031601770380525
360009410250031601480380524
320008440250031601380380523
260007200250031601100380522
220006230250031601000380521
16000459025003160750380520

calculated size Request for information

Technical details

Installation

max. earth covering [mm] (without groundwater, vehicle loading) 1500

Accessibility

Earth covering with loading capacity [mm] 800 - 1500
max. axle load [t] 8
max. vehicle weight [t] 40

Groundwater installation

Earth covering with groundwater installation [mm] 800 - 1500
Eintauchtiefe ins Grundwasser bis Tankmitte

General

Warranty period (years) 30

Accessory