D-Raintank

The problem.
Sealing the ground, and the consequences of this.

High population density and strong growth mean more and more housing and traffic areas. Building homes and traffic routes and the development of commercial areas are the main causes for the increased surface sealing. No end to urbanisation and population movement to the countryside can yet be foreseen. In the last 50 years in many places, twice as much surface has been sealed as in the whole of settlement history before that.
A far reaching, serious impairment of the natural circulation of water, with rain, seepage, outflow and evaporation, is the consequence. It is essential to counteract the constant expansion of sealing. This will avoid the subsequent ecological and economic damage.

Nature
In natural conditions, the proportion which soaks away is 95%, the amount of surface water run-off is 5 %.

Countryside.
In the countryside, the proportion which soaks away is 70%, the amount of surface water run-off is 30 %. Changes to the soil structure and sealing due to agricultural use, house building and infrastructure.

Town.
The proportion which soaks away with low-density building is 30%, the amount of surface water run-off is 70 %. Continued sealing and thus an increase in the amount of water running off (roof, factory, traffic and parking surfaces).

Urban.
In the core areas, the proportion which soaks away is only 5%, the amount of surface water run-off is 95 %. Sealing of the ground virtually across the board, complete run-off of the rainwater into the drainage system.

The consequence.

Distorting the circulation of water by sealing the surface brings with it a whole range of negative consequences:

         • The filtration effect of the soil is lost.
         • Extremely restricted rainwater seepage.
         • The lowering of the water table and with it the associated lack of water and drying out of the           soil.       
         • More difficulty in the extraction of drinking water.
         • Increased flood damage.
         • Overloading of the sewer network and the sewage treatment plants by floodwater.
         • Contamination of rainwater.


Result:
Instead of the conventional, widespread collection and central diversion of surface water, a sensible cost saving management of rainwater must be brought in. The solution lies in the seepage or slow trickling of water on the spot by suitable systems:D-Raintank^®.

The costs

Constant investment in expansion and maintenance of the sewer network are driving up the costs of getting rid of rainwater. Additional costs are incurred for rain water retention construction work and new buildings with larger sewage pipe diameters. This is because ever-greater quantities of rainwater have to be managed. The growing expenditure is reflected in steadily increasing drainage and sealing charges.

The prospects

New regulations give the seepage or slow trickling of rainwater on site priority over the conventional diversion into the sewer network. The aim is to keep intervention into the natural water circulation as small as possible. The spread of soak-away systems for rainwater will in future take the load off the sewer networks and protect these. Thus, charges and other costs will come out lower.

Bringing about close-to-nature rainwater management.:

         • Avoidance / reduction of sealed surfaces.
         • Rainwater soak-away / seepage on site.
         • Regulated diversion of rainwater.
         • Rainwater utilisation, cleaning and storage.

The solution.
Local soak-away with the D-Raintank^®

The D-Raintank^® was specially developed for the requirements of rainwater soak-away on site.

• The D-Raintank^® is intended for underground use and consists of specially developed plastic elements with a high storage capacity of 95 %. In comparison to this, a normal gravel or ballast drainage ditch only achieves 30 % to 35 %. The elements are simply put together, allowing storage volumes of varied sizes to be made up. The stored rainwater is gradually given up into the soil.

• The compact build and variable arrangement even allows installation in the tightest space or in other difficult installation conditions. Here its light weight is an advantage, as is its stability.

• Because of its large storage capacity the D-Raintank^® system needs considerably less room than other installations. The D-Raintank is ideal for retro fitting.

• When it comes to economy the D-Raintank^® is clearly ahead of the field: its use means not only considerable savings in material, installation and excavation costs compared with other systems but also public subsidies, a possible tax write-off for a rainwater soak-away on site and also more favourable decisions on charges - with a regional differences

The D-Raintank^®
The forward looking system for rainwater soak-away on site

The D-Raintank^® manages two important tasks; retention of water below the ground and soaking it away.
The D-Raintank^® combines an extremely high storage capacity with great stability for underground use.
The D-Raintank^® is a double box element, put together from statically calculated grid plates, and is completely wrapped in a geo-textile. The geo-textile is water permeable and the water flow can go through it from either side (outside / inside). The individual tanks can be laid in various ways depending on the space situation. When they are combined, they form underground rainwater storage compartments in which the rainwater is first taken up and then soaked away or taken elsewhere.

The D-Raintank^® is light.

Internal construction: 5 head plates bring enormous stability. The geo-textile with which the D-Raintank^® is wrapped consists of polypropylene (PP), which is particularly suitable due to its high water permeability (140 l / sec / m 2). Sediments (sand etc) are prevented from washing in.

The D-Raintank^® is made of polypropylene, a very resistant high quality plastic (neutral to groundwater, resistant to acidic and alkaline fluids, stable in form and completely recyclable).

Installation.
Simple - fast - flexible - inexpensive.

Simple
The excavation (1) can be managed with simple equipment and small machines. The advantage when retro-fitting: careful treatment of the green areas and plants on the site. The excavation can be refilled directly after assembly. No more earth needs to be excavated than is absolutely necessary - so only a small amount of superfluous earth remains behind and can be used for other garden work.

Fast
After putting in the support layer (2) of ballast, gravel, sand etc, the fleece (3) is then rolled out, the light weight tanks are set up and arranged (4), the fleece wrapped round them, the connection made with blue HS pipes (5) and the trench refilled again. The D-Raintank^® system is now assembled and ready for use! The stable construction of the D-Raintank^® allows a small amount of coverage (minimum 40 centimetres for areas which are walked on). This too saves time and money.
Flexible
The D-Raintanks^® can be combined in many ways and thus can always be adapted to suit the local circumstances and the required storage capacity.

Inexpensive
No expensive manhole work. The high storage capacity guarantees an economical installation of the tanks. The low weight saves installation and storage costs. No additional materials are needed.

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Everything matches!
Quality products Made in Germany – convincing products for rainwater management.
All from a single source – utilise the benefits of a complete system

The required materials are co-ordinated with each other and together give an efficient soak away system, which can be used without problems.
From the down pipe right to the drainage sewer - tried-and-tested products which reliably fulfil their function.

Regulating manhole DN / OD 315

Cleaning manhole DN / OD 315
Up to 400 m² of roof surface.
Detail: leaf trap (interior view).

87° long bend.

HS^® moulded components DN / OD 110.

HS^® - R pipe DN / OD 110

D-Raintank^® connecting element

KS stand pipe DN / OD 110
Zinc grey / copper brown.

The D-Raintank^® flushing element.
With HS partial seepage pipe DN / OD 250

HS^® cleaning shaft with D-Raintank^® flushing element.
Up to 1500 m 2 of roof surface.

HS^® regulating manhole DN / OD 800.

HS^® cleaning manhole DN / OD 800

D-Raintank^®
Without geo-textile, 6 units per pallet.

D-Raintank^®
Type II and III with DN / OD 110 connection

The comparison
The D-Raintank^® was specially developed for the requirements of rainwater soak-away on site.
An advantage in storage capacity, ground excavation and installation time.

Comparison of the D-Raintank^® (1 m3)

The comparison

The D-Raintank^® was specially developed for the requirements of rainwater soak-away on site.
An advantage in storage capacity, ground excavation and installation time.

The D-Raintank^® - at the heart of the soak away system.

Important: even when planning a soak away system, care should be taken to ensure that the storage body is as long and as narrow as possible in design so that it presents as much wall area as possible in relation to the base.

Maintenance
Maintenance of the D-Raintank^® is limited to checking the process and cleaning the leaf trap in the cleaning manhole.

The geo-textile.
The geo-textile has the purpose of protecting the D-Raintank^® from the ingress of fine particles. At the same time, it should ensure a continual outflow of the stored water into the soil.

Private site in a residential area.

The Brillux Company, Cologne.

Aldi consumer market / Sendenhorst.

Franken company / Oberhausen.

Firma Siemens/Mühlheim

Siemens / Nuremberg

Westbury / UK

Eindhoven / Holland

Examples of applications with D-Raintank^®

D-Raintank^® set up in series, with a cleaning manhole upstream and a regulating manhole downstream.
Connection: HS^®-R pipes

D-Raintank^® as an overflow soak away for rain water reservoir with a cleaning manhole upstream.
Connection: HS^®-R pipes

Traffic areas flooded by heavy downpours of rain can be drained inexpensively and locally with D-Raintank^®

Town square and parking area drainage with D-Raintank^®

Commercial areas can be drained in the smallest space using D-Raintank^®.

Benefits for all!

Rainwater soak away as an indispensable part of the water cycle.
• Drainage charges fall to those causing them.
• Cost savings are achievable:
   - in the development of building areas
   - in the building and maintenance of drainage systems.
• No loss of surface area thanks to the underground installation.
• Rainwater can be sensibly utilised.
• The natural water circulation is maintained.
• Promotes the replenishment of groundwater.
• The local water management of the soil will be retained.
• Improvement in quality of the groundwater due to soil filtration.
• Effective relief of the load on the sewer network.
• District drains are reduced.
• Reduction in the quantity of water in sewage treatment plants.
• Lower development cost when building new sewers.
• Connection of new building areas to existing fully utilised drainage systems.
• A lower feed of rainwater into waterways giving a reduction in the local high water peaks.

Product benefits.
The D-Raintank^® shows the way to the future.

• Storage capacity up to 95% of the total volume.
• The high storage capacity means smaller installations = less excavation of earth.
• Lightweight tank elements = low transport costs and easy handling.
• Up to threefold space saving possible due to compact build.
• The water can flow through in three dimensions.
• Permeable surface structure of around 75% (water soaks away on all sides)
• Uncomplicated quick installation = saving of building costs.
• Low utilisation of time, labour and equipment.
• Flexible arrangement of the tank elements.
• Free arrangement of the inlets and outlets.
• Low maintenance requirement.
• Can take the load from lorries and cars of to a maximum of SLW 60 according to test
   certificate number 01 / 641 / LA from the ZEM laboratory.
• Wide range of uses (soak away, drainage, groundwater replenishment, watering trees,
   overflow from a rainwater utilisation plant etc.)
• Low installed height so can even be used with high water tables.
• Flexible in use (e.g. on site with a slope, soils with poor permeability, narrowest spaces,
  retro-fitting work etc.)
• Environmentally friendly plastic (PP, impact resistant, long working life, neutral in
 groundwater, recyclable)



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