Aqua Cell 4

STORMWATER MANAGEMENT

Box Clever with AquaCell Systems

Intelligent Solutions for

Below Below Ground Ground Projects Projects

Stormwater Management Systems

Temporary storage or infiltration

Versatile, effective, reliable solutions – from OSMA

SUDS policy aims to achieve this

OSMA Stormwater Management Systems,

in two ways:

including AquaCell systems – AquaCell

Temporary storage of excess flows,

and new AquaCell Lite – are now making

so that immediate outflow into streams

a major contribution to SUDS, and to

The need for Sustainable Drainage [SUDS]

and rivers is limited

reducing the risks posed to developed

When any previously undeveloped site

stormwater into the ground

is built on and paved over, water run-off from the newly impermeable surface increases by up to 80%. This can place excessive pressure on existing watercourses and local drainage infrastructure. So when storms bring sudden, unusually heavy rainfall, there can be localised flooding and damage to property. Government and the Environment Agencies are now promoting the use of Sustainable Drainage Systems [SUDS] to restrict run-off to a level equivalent to that of a natural green field site.

Efficient soakaways to infiltrate

Box systems – select with care Rising rainfall levels, and increased focus on SUDS compliance, have led to a sharp increase in the use of modular box systems to create underground structures for infiltration or temporary storage of stormwater. However, not all currently available systems have the proven performance characteristics necessary for the wide range of complex underground geocellular applications (see page 7). With OSMA AquaCell systems, however, the required strength and hydraulic capabilities have been verified by independent testing.

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areas by sudden major downpours.

The AquaCell® Principle

The AquaCell systems are a fully tried and tested modular technique for managing

Benefiting the community and the environment

Supporting SUDS – and facilitating planning approval

excessive rainfall by creating an

AquaCell systems contribute the

The proven qualities and performance of

underground structure as either a

following benefits:

the AquaCell system not only support the

temporary storage tank or a soakaway: AquaCell for trafficked locations (page 4), and NEW AquaCell Lite for landscaped and non-trafficked areas (page 5) The lightweight polypropylene, high void units are securely linked together using special clips and shear connectors and

Significantly reduced flooding risk Controlled, reduced-volume release of stormwater into existing sewer systems

achievement of SUDS, they can also help reinforce and enhance planning applications, and enable development to proceed.

The AquaCell units have:

or watercourses Recharging of local groundwater

160mm pre-formed socket

(if infiltration/soakaway application)

95% void

Aerobic purification to improve water run-off quality

and are supplied with: Shear connectors: to secure units

can be assembled quickly on site into

Sustainable, cost effective management

whatever configuration suits each specific

of the water environment

location. AquaCell geocellular systems

together vertically Clips: to secure units together horizontally

also allow ‘brick-bonding’, which can give extra stability, without the need for additional connector pieces.

Wrapped for infiltration or storage The complete assembly is wrapped in either geotextile or a geomembrane (wrapped with a protective fleece). 0.4m

For pervious soils, the geotextile allows infiltration of stormwater into the surrounding ground. Where the ground is impervious (e.g. clay) or where infiltration is not desirable, the geomembrane encapsulated assembly holds stormwater in temporary storage until local drainage flows can accept it for normal disposal.

1m

0.5m

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AquaCell For trafficked sites

Typical applications

OSMA AquaCell is ideal for areas subject to regular and heavy traffic loading, and particularly for larger projects. Specifiers, developers and contractors

In addition to features and benefits

can now choose the right product to suit

applicable to BOTH systems those

each situation. The original AquaCell (blue

specifically applicable to traffickable

unit) has already proved its versatility and

AquaCell (blue unit) include:

Industrial/commercial areas

functional performance advantages in

BBA approved and can meet technical

large projects designed to satisfy

requirements of NHBC

demanding criteria for sustainable drainage. These include:

Proven vertical loading capacity: 56 tonnes/m2

Large scale 7,000 unit soakaway under airport car park

Proven lateral loading capacity: 7.75 tonnes/m2

2,000 unit storage tank in contaminated land, a former power station site

For installations both up to and exceeding 1.5 metres

Residential developments

1,400 unit storage tank to store run-off from expanding retail park

Distinctive BLUE colour – easy to identify

In locations where traffic loading is NOT anticipated, AquaCell Lite (green unit) should be selected (see opposite).

Designed for all configurations and applications, including both shallow and deeper installations: – Ideal for all sizes of project including major attenuation schemes

Roads

AquaCell systems: features and benefits Applicable to BOTH systems Suitable for both soakaway and storage tanks Modular: lightweight and versatile 95% void ratio: holds 190 litres of water per unit

AquaCell Part No: 6LB100

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NEW AquaCell Lite For landscaped and non-trafficked sites

Typical applications

OSMA AquaCell Lite has been designed and developed for landscaped and other traffic-free areas where heavy loading capability is not required.

Domestic gardens

This now enables specifiers, developers

In addition to features and benefits

and contractors to choose the right

applicable to BOTH systems those

product to suit each situation.

specifically applicable to AquaCell Lite

The new AquaCell Lite (green unit) offers

(green unit) include:

all the proven installation versatility and

Proven vertical loading capacity:

functional performance advantages of the

17.5 tonnes/m2

original AquaCell (blue unit – see opposite), but has been specifically engineered

Proven lateral loading capacity: 4.0 tonnes/m2

to provide a cost-effective option for low-loaded locations.

For installation depth (to base of units) of up to 1.5 metres maximum

Grassed and leisure areas

Built-in ‘hand holes’ for easy carrying/handling Distinctive GREEN colour – easy to identify Specifically designed for restricted depth, low-loaded, landscaped sites: – Ideal for smaller projects Roundabouts

Note: NOT suitable for locations subject to high watertable

Safer option than open or above ground storage structures Easy to install and handle Allows ‘brick-bonding’ assembly for extra stability: no extra adaptors needed Proven clip and peg system to secure units Full range of ancillaries: including silt trap and adaptors (see page 7)

AquaCell Lite Part No: 6LB050

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System Selector

Design and Installation Guidance Note: This page includes summary guidance only. For full design and installation procedures, see Stormwater Management Design and Installation Manual or visit www.intelligentosma.co.uk

The following will help you determine

Installation and cover depth

which AquaCell system is correct

After deciding which AquaCell system

for each specific project:

is correct for the project location (using the System Selector – left), see the

Will the site be subject to traffic loadings?

following Table for the recommended maximum installation depths and minimum cover depths.

YES

NO

MINIMUM cover depth AquaCell AquaCell Lite

Use AquaCell

Location type

(blue unit)

Landscaped/non-trafficked areas

0.5m

0.3m(2)

– up to 3 AquaCell units wide in trench

0.6m

n/a

– more than 3 AquaCell units wide

0.75m

n/a

(1)

Car parks, vehicle up to 2500kg

gross mass, with AquaCell system:

Does the site have a high water table? YES

NO

Use AquaCell

MAXIMUM depth to base of unit (1)

For specific advice on cover depths for heavier loadings/HGV applications, contact Wavin Technical Design on 01249 766655

(2)

0.3m is minimum depth for AquaCell Lite, although 0.5m cover is recommended to prevent accidental damage. If construction plant is to be used on site during installation, please see Installation guidance on page 7

(3)

Allowable maximum depth to base of bottom layer of units is dependent on soil type, angle of shearing resistance, loadings, and groundwater level. In poor ground conditions a shallower depth may apply.

(blue unit)

Will the tank be MORE THAN 12m across in both width and length? YES

NO

Hydraulic and structural design Both AquaCell and AquaCell Lite have identical dimensions: 1m x 0.5m x 0.4m,

Use AquaCell

with a nominal void ratio of 95%.

(blue unit)

Hydraulic calculations are accordingly the same for both systems. Structural design requires careful consideration of loading

Will the tank be MORE THAN 3 units deep?

factors specific to each location. (see Geocellular structures: important design considerations on page 7).

YES

6

NO

Use AquaCell

Use AquaCell

(blue unit)

Lite (green unit)

4.1m

(3)

1.5m

AquaCell Lite: additional installation guidance

Geocellular structures: important design considerations (see Note*)

Due to the special physical properties of AquaCell Lite, certain precautions are recommended on site to prevent damage to

To guarantee structural integrity, any 5

underground structure must be strong

the units through excess loading.

enough to support the loads to which it will be subjected without any unacceptable deflection.

Manual assembly

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Whilst assembling the tank, it may be 2

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necessary to walk on top of previously

The correct choice of geocellular box

laid units, care should be taken not to

must have appropriate proven top

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(vertical) and side (lateral) load bearing

Construction traffic on site

capacity and deflection characteristics to suit site conditions. The five key site considerations to be noted when designing a geocellular box system are: 1 Depth of cover (see page 6) 2 Soil type 3 Surface finishing 4 Presence of groundwater 5 Type of traffic/loading

damage the edges of the units.

If construction plant (e.g. excavators *Note: The combination of these factors effectively means that the required characteristics of a geocellular system to be installed under a trafficked location (for example) will be very different from that under a landscaped/low-loaded location.

or loaders) are likely to run over the installation: MINIMUM protective cover: 500mm

EXAMPLE A: Car park with occasional lorry traffic and 0.6m cover depth. Typically requires minimum vertical strength of 40 tonnes/m2

well-compacted granular material

EXAMPLE B: Landscaped/non-trafficked location and 0.3m cover depth. Typically requires minimum vertical strength of 17.5 tonnes/m2

14 tonnes. Compaction plant not to

These factors have already been taken into consideration within the simple selection flow chart on page 6 for BOTH AquaCell systems.

HGVs MUST NOT be allowed to run

Excavators MUST NOT exceed exceed 2,300kg per metre width

over installed AquaCell Lite units Backfilling When backfilling AquaCell Lite installations:

Ask Now For further information For product literature CALL: 01249 766333

Machines placing the material must be located OFF the units Only light compaction should be applied to the material If Type 1 sub-base (or similar) material over AquaCell Lite units requires compaction:

For comprehensive information online: VISIT: www.intelligentosma.co.uk for further information about AquaCell products, applications and the needs of sustainable drainage

VISIT: www.wavin.co.uk for the complete OSMA product catalogue

First layer should be 300mm thick before any compaction NO vibratory mechanism should be used for compacting this first layer MAXIMUM roller size: 2,300kg per metre width

Technical advice

Ancillaries and Adaptors

CALL: 01249 766655

All ancillaries and adaptors available for use with AquaCell can be used with the new

Arrange a meeting

AquaCell Lite system, except the 225mm

CALL: 01249 766369

Flange Adaptor (6LB106). The 150mm Flange Adaptor (6LB104) should only be used when constructing an air vent.

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New solutions for stormwater management

Meeting your needs OSMA solutions for stormwater management projects, developed by Wavin Plastics Limited, forms part of a comprehensive range of plastic systems to provide intelligent solutions for all building, construction and utilities programmes. These include: Above Ground Projects OSMA Rainwater systems OSMA Soil & Waste systems Plumbing & Heating Projects OSMA Flexible Plumbing systems OSMA Underfloor Heating systems Below Ground Projects OSMA Below Ground Drainage systems OSMA Water Management systems OSMA Ducting systems Pressure Pipe Projects OSMA Pressure Pipes for Water

All OSMA systems are backed by full technical literature and project support.

Wavin Plastics Limited Parsonage Way Chippenham Wiltshire SN15 5PN Tel: 01249 766600 Fax: 01249 443286 Email: [email protected] www.wavin.co.uk

Water UK Partner – supporting information and learning in the water industry

ISO 9001:2000

Wavin Plastics Limited operates a programme of continuous product development, and therefore reserves the right to modify or amend the specification of their products without notice. All information in this publication is given in good faith, and believed to be correct at the time of going to press. However, no responsibility can be accepted for any errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for the purpose and application intended.

For further information about AquaCell products, applications and the needs of sustainable drainage visit:

www.intelligentosma.co.uk

W0035/07

OSMA Pressure Pipes for Gas