Aqua Cell Water Management System

FOR RESIDENTIAL,

COMMERCIAL AND

INDUSTRIAL APPLICATIONS

Stormwater Management SystemsAquaCell®, AquaCell Lite® & Garastor®

Product andInstallation Guide

Intelligent Solutions for Below Ground Projects

CI/SfB(52.5) (90.51)

July 2005 WM420

Uniclass EPICJR12/JS10 L731/L71121/L2123 J3413 X721

CUSTOMER SERVICES 01249 766611

TECHNICAL ENQUIRIES01249 766655

TECHNICAL FAX 01249 766653

[email protected]

STORMWATER MANAGEMENT SYSTEMSIntroduction to OSMA - from Wavin

2

From WavinOSMA

OSMA, from Wavin Plastics Limited, is

the leading name in plastic systems for

building, construction and utilities. The

OSMA product range is unrivalled in

scope and quality, covering:

Above Ground systems

Plumbing and Heating systems

Below Ground Drainage systems

Water Management systems

Ducting systems

Water and Gas Distribution systems

Quality assured products

OSMA systems are the benchmark for

excellence and product innovation:

precision-manufactured in the UK using

the most advanced injection moulding

and extrusion machines. All products

comply with or exceed relevant British

and European standards to ensure

reliability and long-lasting service.

Intelligent connections

OSMA systems offer integrated solutions.

This enables specifiers and installers to

assemble complete drainage, plumbing

and heating, and pressure pipe systems

from a single source, with complete

confidence in compatibility and

performance.

All systems are backed by comprehensive

technical support and a nationwide

distribution network to ensure availability

when and where required.

Wavin is a leading European manufacturer

of industrial plastic products, and one of

the largest producers of plastic pipe and

fittings in the world.

Wavin is credited with inventing and

pioneering the use of plastic pipe

for water distribution in the mid 1950s.

Constant research and development has

enabled Wavin to maintain its position at

the forefront of plastics technology.

Environmental responsibility

Wavin Plastics Limited has BS EN ISO

9001: 2000 BSI status and was the

first plastic pipe manufacturer to be

accredited to BS EN ISO 14001

Environmental Management Systems.

Wavin Plastics Limited is committed to

environmental responsibility, and is a

leading pioneer of systems to conserve

and control water. In production,

the Company recycles the majority

of waste materials, and sets annual

targets for energy efficiency audited by

the certifying body.

Passion and resourcefulness

All Wavin personnel are committed to

providing a comprehensive, responsive

service – and are passionate about

delivering total Customer satisfaction.

Wavin Plastics Limited maintains an

industry-wide dialogue and rigorous

assessment of all procedures to ensure

that Wavin product development and

product support accurately addresses

the needs of all Customers – today and

into the future.

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSIntroduction to OSMA from Wavin ■ Contents

STORMWATER MANAGEMENT SYSTEMSContents

STORMWATER MANAGEMENT SYSTEMS Product & Installation Guide 2005

General Introduction 4

Stormwater ManagementSystems 4–5

AquaCell 4

AquaCell Lite 4

Garastor 5

The AquaCell principle 5

Overview of AquaCell Systems 6

How they Work 6

AquaCell for trafficked sites 7

New AquaCell Lite for landscaped andnon-trafficked sites 8

AquaCell Systems – PrincipalComponents 9

System Selector 10

Design and InstallationGuidance 10–11

Typical Soakaway Installation Method 12

Typical Storage Tank Installation Method 13

Typical Silt Trap Installation Method & Air Vent Design 14

Contents

Typical Connections to AquaCell/AquaCell Lite 15

Typical Air Vent Connections 16

Typical Manifold Configuration 17

Typical Soakaway Detail: Non-TrafficLoading 18

Typical Soakaway Detail: Highway 19

Typical On-Line Water Storage Detail 20

Typical Off-Line Storage Detail 21

Hydraulically Designed On-Line WaterStorage System Installed Off-Line 22

Typical Soakaway Detail with Silt Trap 23

Introduction to Garastor 24

Garastor System Overview 25

Garastor Principal Components 26

Typical Garastor Installation Methods 27

Case Studies 28

Notes 29

Further information data card 30

Technical Advice andAssistance 31

Further information

The following related publications are

available for OSMA Stormwater

Management systems:

Design and Installation Manual

Trade Price List

To obtain copies, please contact:

Literature requests

Tel: 01249 766333

Fax: 01249 766332

[email protected]

3




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STORMWATER MANAGEMENT SYSTEMSGeneral introduction ■ Stormwater Management Systems

4

Development of sites results in a large

proportion of area being covered by

impermeable surfaces such as roofs, car

parks and roads. Surface water run-off

therefore increases up to 80%. Regulators

(Environment Agency, Scottish Environment

Protection Agency and local authorities) are

promoting the use of Sustainable Drainage

Systems (SUDS) that control run-off to that

of a greenfield site (around 20%).

Wavin Stormwater Management Systems

have been developed to provide a method

of source control in two ways:

By providing temporary storage for

excess flows and limiting outflow to

streams and rivers.

By providing soakaways to infiltrate

stormwater back into the ground.

The modular nature of Wavin Stormwater

The AquaCell® Systems:

The AquaCell systems are a fully tried and

tested modular technique for managing

excessive rainfall by creating an

underground structure as either a

temporary storage tank or a soakaway:

AquaCell (blue unit)

for trafficked locations

AquaCell Lite (green unit)

for landscaped and non-trafficked sites

AquaCell

AquaCell Lite

Management Systems means that they

can be tailored to suit the specific

requirements of each site. They can be

used to provide temporary storage,

attenuation and infiltration capacity for run-

off for all sizes and types of site: from

individual houses up to the largest

commercial developments.

General Introduction

Stormwater Management Systems

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 11).

With OSMA AquaCell systems,

however, the required strength and

hydraulic capabilities have been verified

by independent testing.

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSGeneral Introduction ■ The AquaCell® Principle

STORMWATER MANAGEMENT SYSTEMSStormwater Management Systems ■ The AquaCell® Principle

5


Garastor ® System*

A polypropylene flow control chamber

connected to a water storage reservoir

EITHER made up of AquaCell units or

located in a void beneath the garage of

individual houses.

* Depending on the application either AquaCell orAquaCell Lite may be used in conjunction with Garastor.For further details contact Wavin Technical Design.

Stormwater Management Systems continued

Note: Garastor can be used as a flow control devicefor any AquaCell storage system, no greater than oneunit deep with a discharge of up to 1.4 l/s via the30mm release flow orifice.

Garastor domestic storage using AquaCell tank Garastor domestic storage using garage void

* Garastor is manufactured under licence (Patent Number GB2357093)

OSMA AquaCell StormwaterManagement System

Comprises individual infiltration modules

assembled together to form underground

structures which can either be used for

stormwater storage or as an alternative to

domestic soakaways.

Heavy storms and major cloudbursts are

becoming more frequent, resulting in ever

increasing volumes of stormwater flowing

into conventional drainage systems and

water courses. When the capacities of these

systems are exceeded the consequences

can be dramatic and damaging.

Stormwater must be controlled; either by

limiting the outflow and providing

temporary storage or where the ground

conditions are suitable, providing

soakaways for the stormwater to infiltrate

back into the surrounding ground.

This has the added benefit of recharging

the local groundwater.

Both options can be achieved using either

OSMA AquaCell or OSMA AquaCell Lite

depending on the application.

The AquaCell® Principle

Domestic AquaCell soakaway

Large scale AquaCell storage tank

AquaCell Lite soakaway




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STORMWATER MANAGEMENT SYSTEMSAquaCell Systems Overview ■ How they work

6

Both OSMA AquaCell and AquaCell Lite

units are modular in shape (1.0m x 0.5m

x 0.4m), have a 95% void and a capacity

of 190 litres per unit. The lightweight,

polypropylene units are easy to handle

and install. Original AquaCell (blue unit)

weigh 9kg each and AquaCell Lite (green

unit) weigh 7kg each. Individual units are

securely linked together using special

clips and shear connectors and can be

assembled quickly on site into whatever

configuration suits each specific location.

AquaCell geocellular systems 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).

For pervious soils, the geotextile allows

infiltration of stormwater into the

Stormwater exceeding the capacity of the

conventional drainage system is

attenuated by the control manhole and

channelled into the AquaCell unit

assembly. The internal structure of each

unit is designed to bring surging water

under control and hold it in temporary

storage. If the wrap that envelopes the unit

assembly is impermeable the water will

remain in the unit assembly until such a

time as it can flow back into the control

chamber and discharge through the

outflow control. However if the wrap is

permeable, the temporarily stored water

may be released into the surrounding

ground; soil conditions permitting. By

controlling the stormwater at source and

recharging the local groundwater it not

only eases the pressure on conventional

drainage systems but benefits the local

environment as well.

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.

Benefiting the communityand the environment

AquaCell systems contribute the

following benefits:

Significantly reduced flooding risk

Controlled, reduced-volume release of

stormwater into existing sewer

systems or watercourses

Recharging of local groundwater

(if infiltration/soakaway application)

Aerobic purification to improve water

run-off quality

Sustainable, cost effective

management of the water

environment

Supporting SUDS – and facilitating planning approval

The proven qualities and performance of

the AquaCell system not only support the

achievement of SUDS, they can also help

reinforce and enhance planning

applications, and enable development to

proceed.

Control Manhole

This manhole is designed to limit the

downstream discharge using an outflow

control and if necessary redirect the excess

stormwater via an overflow control into the

AquaCell units.

Manifold Configuration

A junctioned pipework assembly providing

a controlled multiple feed of stormwater into

the AquaCell Units. The configuration is

tailored to suit the capacity required upon

entry into the AquaCell Unit assembly and

upon discharging to the control manhole.

Overview of AquaCell® Systems

How they work

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

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 9)

AquaCell

AquaCell Lite

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSOverview ■ How they work ■ AquaCell for trafficked sites

STORMWATER MANAGEMENT SYSTEMSAquaCell for trafficked sites

7


AquaCell for trafficked sites

In addition to features and benefits

applicable to BOTH systems those

specifically applicable to traffickable

AquaCell (blue unit) include:

BBA approved and can meet technical

requirements of NHBC

Proven vertical loading capacity:

56 tonnes/m2

Proven lateral loading capacity:

7.75 tonnes/m2

For installations both up to and

exceeding 1.5 metres deep

Distinctive BLUE colour

– easy to identify

Designed for all configurations and

applications, including both shallow

and deeper installations:

– Ideal for all sizes of project including

major attenuation schemes

Specifiers, developers and contractors

can now choose the right product to suit

each situation. The original AquaCell (blue

unit) has already proved its versatility and

functional performance advantages in

large projects designed to satisfy

demanding criteria for sustainable

drainage. These include:

Large scale 7,000 unit soakaway under

airport car park

2,000 unit storage tank in

contaminated land, a former power

station site

1,400 unit storage tank to store run-off

from expanding retail park

In locations where traffic loading is NOT

anticipated, AquaCell Lite (green unit)

should be selected (see overleaf).

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

AquaCell Part No: 6LB100

Typical applications:

Industrial/commercial areas

Residential developments

Roads

Car parks




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STORMWATER MANAGEMENT SYSTEMSNEW AquaCell Lite for landscaped and non-trafficked sites

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AquaCell Lite Part No: 6LB050

NEW AquaCell Lite for landscaped and non-trafficked sites

In addition to features and benefits

applicable to BOTH systems those

specifically applicable to AquaCell Lite

(green unit) include:

Proven vertical loading capacity:

17.5 tonnes/m2

Proven lateral loading capacity:

4.0 tonnes/m2

For installation depth (to base of units)

of up to 1.5 metres maximum

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

Note: NOT suitable for locations subject to highwatertable

This now enables specifiers, developers

and contractors to choose the right

product to suit each situation.

The new AquaCell Lite (green unit) offers all

the proven installation versatility and

functional performance advantages of the

original AquaCell (blue unit – see page 7),

but has been specifically engineered

to provide a cost-effective option for

low-loaded locations.

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

Typical applications:

Domestic gardens

Grassed and leisure areas

Roundabouts

Domestic back gardens

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSAquaCell Lite® ■ Principal Components

STORMWATER MANAGEMENT SYSTEMSAquaCell Systems – Principal Components

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AquaCell Systems – Principal Components

6LB104*150mm Flange Adaptor

(Adaptor to be used at points otherthan pre-formed socket to connect

to 150mm UltraRib)

6LB106**225mm Flange Adaptor

(to connect to 225mm UltraRib)

4D916160mm OsmaDrain

P/E Adaptor(fits into pre-formed socket

as an extensionconnection piece)

6LB102Shear Connector(used to hold unitstogether vertically)

6TW141TwinWall S/S

Adaptor(fits into pre-formedsocket to connect to

150mm TwinWall)

6UR141UltraRib S/S

Adaptor(fits into pre-formedsocket to connect to

150mm UltraRib)

6D099160mm x 110mm

OsmaDrainS/S Reducer

(fits into pre-formed socketto connect to 110mm

OsmaDrain)

Silt Trap6LB600

(Extension Kit also available if required, seepage 26 for details)

AquaCell Unit6LB100

0.5m

1m

0.4m

AquaCell Lite Unit6LB050

0.5m

1m

0.4m

6LB105Clip

(used to hold unitstogether horizontally)

* 6LB104 – Can only be used when constructing an air vent, on the top surface of the unit, when installed with AquaCell Lite (6LB050)** 6LB106 – Not suitable for use with AquaCell Lite (6LB050)

160mm diameterpre-formed socket




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STORMWATER MANAGEMENT SYSTEMSSystem Selector ■ Design and Installation Guidance

10

Note: This page includes summary guidance only. For full design and installation procedures, seeStormwater Management Design and InstallationManual or visit www.intelligentosma.co.uk

Installation and cover depth

After deciding which AquaCell system

is correct for the project location (using the

System Selector – left), see the

following table for the recommended

maximum installation depths and

minimum cover depths.

(1) For specific advice on cover depths for heavier loadings/HGV applications, contact WavinTechnical Design on 01249 766655

(2) 0.3m is minimum depth for AquaCell Lite, although0.5m cover is recommended to prevent accidentaldamage. If construction plant is to be used on siteduring installation, please see Installation guidance onpage 11

(3) Allowable maximum depth to base of bottom layer ofunits is dependent on soil type, angle of shearingresistance, loadings, and groundwater level. In poorground conditions a shallower depth may apply.

Hydraulic and structural design

Both AquaCell and AquaCell Lite have

identical dimensions: 1m x 0.5m x 0.4m,

with a nominal void ratio of 95%. Hydraulic

calculations are accordingly the same for

both systems. Structural design requires

careful consideration of loading factors

specific to each location.

(see Geocellular structures: important

design considerations on page 11).

The following will help you determine

which AquaCell system is correct

for each specific project:

Will the site be subject to traffic loadings?

YES NO

Use AquaCell

(blue unit)

Will the tank be MORETHAN 3 units deep?

YES NO

Use AquaCell Use AquaCell

(blue unit) Lite (green unit)

Does the site have a high watertable?

YES NO

Use AquaCell

(blue unit)

Will the tank be MORETHAN 12m across inboth width and length?

YES NO

Use AquaCell

(blue unit)

Landscaped/non-trafficked areas 0.5m 0.3m(2)

Car parks, vehicle up to 2500kg(1)

gross mass, with AquaCell system:

– up to 3 AquaCell units wide in trench 0.6m n/a

– more than 3 AquaCell units wide 0.75m n/a

MAXIMUM depth to base of unit 4.1m(3) 1.5m

Location typeMINIMUM cover depthAquaCell AquaCell Lite

Design and Installation GuidanceSystem Selector

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSSystem Selector ■ Design and Installation Guidance

STORMWATER MANAGEMENT SYSTEMSDesign and Installation Guidance

11


AquaCell Lite: additionalinstallation guidance

Due to the special physical properties of

AquaCell Lite, certain precautions are

recommended on site to prevent damage

to the units through excess loading.

Manual assembly

Whilst assembling the tank, it may be

necessary to walk on top of previously laid

units, care should be taken not to damage

the edges of the units.

Construction traffic on site

If construction plant (e.g. excavators

or loaders) are likely to run over the

installation:

MINIMUM protective cover: 500mm

well-compacted granular material

Excavators MUST NOT exceed

14 tonnes. Compaction plant not to

exceed 2,300kg per metre width

HGVs MUST NOT be allowed to run

over installed AquaCell Lite units

Backfilling

When backfilling AquaCell Lite installations:

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:

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

Ancillaries and Adaptors

All ancillaries and adaptors available for use

with AquaCell can be used with the new

AquaCell Lite system, except the 225mm

Flange Adaptor (6LB106). The 150mm

Flange Adaptor (6LB104) should only be

used when constructing an air vent, on the

top surface of the unit.

Geocellular structures:important design considerations (see Note*)

To guarantee structural integrity, any

underground structure must be strong

enough to support the loads to which

it will be subjected without any

unacceptable deflection.

The correct choice of geocellular box

must have appropriate proven top

(vertical) and side (lateral) load bearing

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 10)

2 Soil type

3 Surface finishing

4 Presence of groundwater

5 Type of traffic/loading

*Note: The combination of these factors effectivelymeans that the required characteristics of a geocellularsystem to be installed under a trafficked location (for example) will be very different from that under a landscaped/low-loaded location.

EXAMPLE A: Car park with occasional lorry traffic and0.6m cover depth. Typically requires minimum verticalstrength of 40 tonnes/m2

EXAMPLE B: Landscaped/non-trafficked location and0.3m cover depth. Typically requires minimum verticalstrength of 17.5 tonnes/m2

These factors have already been taken into consideration within the simple selection flow chart on page 10 for BOTH AquaCell systems.

3

2 1

4

5

Design and Installation Guidance continued




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STORMWATER MANAGEMENT SYSTEMSTypical Soakaway Installation Method

12

OSMA AquaCell/AquaCell Lite Units Permeable Geotextile*

Coarse Sand or Non Angular Granular Material Base and Surround

100mm

100mm

100mm

Pre-formed Socket

Typical Soakaway Installation Method

1. Excavate the trench to the required

depth ensuring that the plan area is

slightly greater than that of the

AquaCell/AquaCell Lite units.

2. Lay 100mm bed of coarse sand or non

angular granular material, level and

compact.

3. Lay the geotextile* over the base and

up the sides of the trench.

4. Lay the AquaCell/AquaCell Lite units

parallel with each other. In multiple

layer applications, wherever possible,

continuous vertical joints should be

avoided. AquaCell units can be laid in

a ‘brick bonded’ formation (i.e. to

overlap the joints below). For single

layer applications use the AquaCell

Clips and for multi layers use the

AquaCell Clips and the AquaCell Shear

Connectors.

5. Fix the Adaptors to the AquaCell Units

as required and connect pipework.

6. In order to prevent silt from entering the

tank, clogging inlet pipework and

reducing storage capacity, it is

recommended that the OSMA Silt Trap

(6LB600) is installed prior to the inlet

pipework - see page 14 for installation

guidelines.

7. Wrap and overlap the geotextile

covering the entire AquaCell/AquaCell

Lite structure.

8. Lay 100mm of coarse sand or non

angular granular material between the

trench walls and the

AquaCell/AquaCell Lite structure and

compact.

9. Lay 100mm of coarse sand or non

angular granular material over the

geotextile and compact. Backfill with

stone free as-dug material.

10.Rainwater from roof areas may

discharge directly into the soakaway

but rainwater from carparks must

discharge through a catchpit manhole

or a petrol interceptor.

* The geotextile should be selected according tospecific site conditions, however, typically a 300gmaterial will be suitable. Specialist advice shouldbe sought if surrounding soil characteristics exhibita high degree of fines/low infiltration capacityand/or there is a high risk of damage from groundcontaminants.

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSSoakaway Installation ■ Storage Tank Installation

STORMWATER MANAGEMENT SYSTEMSTypical Storage Tank Installation Method

13


Typical Storage Tank Installation Method

1. Excavate the trench to the required

depth ensuring that the plan area is

slightly greater than that of the

AquaCell/AquaCell Lite units.

2. Lay 100mm bed of coarse sand, level

and compact.

3. Lay the geotextile over the base and up

the sides of the trench.

4. Lay the geomembrane on top of the

geotextile over the base and up the

sides of the trench.

5. Lay the AquaCell units parallel with

each other. In multiple layer

applications, wherever possible,

continuous vertical joints should be

avoided. AquaCell units can be laid in

a ‘brick bonded’ formation (i.e. to

overlap the joints below). For single

layer applications use the AquaCell

Clips and for multi layers use the

AquaCell Clips and the AquaCell Shear

Connectors (vertical rods).

6. Wrap the geomembrane around the

AquaCell/AquaCell Lite structure and

seal to manufacturers

recommendations.*

7. Place the Flange Adaptor into position

(at a point other than the pre-formed

socket) and fix using self tapping

screws. Drill a hole through the Flange

Adaptor and connect pipework.

8. In order to prevent silt from entering the

tank, clogging inlet pipework and

reducing storage capacity, it is

recommended that the OSMA Silt Trap

(6LB600) is installed prior to the inlet

pipework – see page 14 for installation

guidelines.

9. Wrap and overlap the geotextile

covering the entire AquaCell/AquaCell

Lite structure, to protect the

geomembrane.

10. Lay 100mm of coarse sand between

the trench walls and the

AquaCell/AquaCell Lite units and

compact.

11.Lay 100mm bed of coarse sand over

the geotextile and compact. Backfill

with stone free as-dug material.

NB: A storage tank must be vented, and it

is recommended that one vent pipe,

110mm in diameter is provided per

7,500 square metres of impermeable

catchment area on a site, see page 14

for design.

OSMA AquaCell/AquaCell Lite UnitsSuitable ProtectiveGeotextile Layer

Coarse Sand or Non Angular Granular Material Base

Suitable ImpermeableGeomembrane*

100mm

100mm

Pre-formed Socket

100mm

* For large scale, deep installations a 1mm thickgeomembrane is recommended and joints shouldbe sealed using proprietary welding techniques.However, for shallow, domestic installations it maybe suitable to use a geomembrane with tapedjoints. For further details contact Wavin TechnicalDesign.




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STORMWATER MANAGEMENT SYSTEMSTypical Silt Trap Installation Method ■ Typical Air Vent Design

14

Typical Silt Trap Installation Method

Typical Air Vent Design

1. Place the Silt Trap (6LB600) on a

minimum of 100mm bed as per pipe

bedding specification. Ensure that the

unit is as close to the

AquaCell/AquaCell Lite tank as

possible and in a suitable position to

allow pipework connection.

2. Connect the relevant pipework in

accordance with standard pipe

installation guidelines.

3. Surround the sides of the Silt Trap with

150mm of ‘as dug’ material, with no

particle sizes larger than 40mm.

4. Fit relevant cover and frame according

to the depth of unit: Up to and

including 1.2m deep = 4D943 deeper

than 1.2m = 6D931.

COVER & FRAME – 1.2m deep use 6D.935. Greater than 1.2mdeep use 6D.939 with reduced opening of 350mm

160mm OsmaDrainInlet/Outlets or use theappropriate adaptor toconnect to 110mmOsmaDrain, 150mmTwinWall or UltraRib

150mm side fill as dugmaterial with no particlesizes larger than 40mm

SHAFT 500mm

450mm

1250mm

100mm bed asper pipe beddingspecification

BalloonGrating(4S302)

Ventilation Box(4D706)

FlangeConnector(6LB104)

110mm OsmaDrain Pipe

150mm x 110mm Reducer(6UR099)

Geomembrane sealed to Flange Note: It is recommended that one vent pipe, 110mm in

diameter, is provided per 7,500 square meters ofimpermeable catchment area on a site. Please contactWavin Technical Design for further details.

Notes: When surrounded by a concrete plinth (150mmx 150mm) the cover can be used in situations with aloading of up to 30Kn (3 tonnes) i.e domestic driveways.

The silt trap can be extended (if required) using the500mm Extension Kit (see details on page 26) inconjunction with a 500mm shaft of TwinWall cut to suit.

Aquacell/AquaCell Lite units

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSSilt Trap Installation ■ Air Vent Design ■ Connections to

AquaCell/AquaCell Lite

STORMWATER MANAGEMENT SYSTEMSTypical Connections to AquaCell/AquaCell Lite

15


Typical Connections to AquaCell/AquaCell Lite

Note: It is recommended that all connections and airvent installations in storage applications (usinggeomembrane) are made using a Flange Adaptor.Adhesive or double sided tape should be usedbetween the geomembrane and the flange plate toensure a watertight seal.

PermeableGeotextile Wrap

Jubilee Clip

160mm OsmaDrain


Connection for soakaway application

using either the pre-formed socket (as

shown below) or standard adaptors into

pre-formed socket*

*Note: For pipework other than 160mm OsmaDrain,these adaptors can be used to connect to thefollowing:

6TW141: TwinWall S/S Adaptor connects to 150mm TwinWall6D099: 110mm OsmaDrain Adaptor connects to 110mm OsmaDrain4D916: 160mm OsmaDrain PE Adaptorconnects to 160mm OsmaDrain6UR141: UltraRib S/S Adaptor connects to150mm UltraRib

Connection for storage application using

Flange Adaptor at points other than

pre-formed socket, (for AquaCell only).

Installation Procedure:

1. Fix Flange Adaptor to the AquaCell

unit with self tapping screws.

2. Drill or cut through the geomembrane

and AquaCell unit using either a

Crown Drill Bit Cutter or similar.

3. Insert pipework into Flange Adaptor.

Geomembrane Wrap

Flange Adaptor(6LB104/6LB106)


150mmPipework tosuit

Note: AquaCell Lite is not suitable for side connectionusing a Flange Adaptor.

AquaCell only(6LB100)





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STORMWATER MANAGEMENT SYSTEMSTypical Air Vent Connections

16

Geomembrane Wrap

Flange Adaptor(6LB104)


Connect suitable pipework to form air vent

Permeable Geotextile WrapJubilee Clip

Suitable bendand pipework toform air vent

OsmaDrain S/S Reducer(6D099)


Typical Air Vent Connections

Note: It is recommended that all connections and airvent installations in storage applications (usinggeomembrane) are made using a Flange Adaptor.Adhesive or double sided tape should be usedbetween the geomembrane and the flange plate toensure a watertight seal.

Connection onto top of AquaCell/

AquaCell Lite unit using Flange Adaptor.

Installation Procedure:

1. Fix Flange Adaptor to the

AquaCell/AquaCell Lite Unit with self

tapping screws.

2. Drill through geomembrane and

AquaCell/AquaCell Lite unit with a long

150mm Crown Drill Bit Cutter.

3. Insert pipework into Flange Adaptor to

form air vent.

Connection into side of AquaCell/

AquaCell Lite unit using standard

adaptors.



www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSTypical Air Vent Connections ■ Typical Manifold Configuration

STORMWATER MANAGEMENT SYSTEMSTypical Manifold Configuration

17


AQUACELL/AQUACELL LITE UNITS

150mm ULTRARIB

300mmULTRARIB

Note: Pipe configuration is dependent on maximumflow. Alternative pipe systems such as TwinWall andOsmaDrain can be used. Please contact WavinTechnical Design for further details.

Typical Manifold Configuration




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STORMWATER MANAGEMENT SYSTEMSTypical Soakaway Detail: Non-Traffic Loading

18

ROOF AREA = 98m2

S

S

TRENCH SOAKAWAY

Notes:

1. Soakaways should be sited at least 5m away fromthe building. (Ref BS8301)

2. The exact size and shape of the soakaways are tobe determined once all the necessary calculationshave been produced.

*Note: For information regarding cover depths andinstallation depths see page 10.

NON-TRAFFIC LOADING AREA

NON-TRAFFIC LOADING AREA

Min depth*

Min depth*

Installationdepth*

Installation depth*

KEY:

= AquaCell/AquaCell Lite Soakaway(see note 2)

S

Typical Soakaway Detail: Non-Traffic Loading

DEEP SOAKAWAY


AquaCell/AquaCellLite

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSSoakaway Details: Non-Traffic Loading ■ Highway

STORMWATER MANAGEMENT SYSTEMSTypical Soakaway Detail - Highway

19


FOO

TPAT

H

150m

mU

LTR

AR

IB

150m

mU

LTR

AR

IB

TOS

OA

KA

WAY

TO R

OA

DG

ULL

Y

225m

mU

LTR

AR

IB

SIL

TTR

AP

FIN

ISH

ED

RO

AD

LE

VE

L

150m

m C

ON

CR

ETE

SU

RR

OU

ND

FOR

MIN

IMU

M D

EP

THO

F C

OV

ER

CO

NTA

CT

WA

VIN

Typical Soakaway Detail - Highway

AQ

UA

CE

LL O

NLY




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STORMWATER MANAGEMENT SYSTEMSTypical On-Line Water Storage Detail

20

GR

OU

ND

LE

VE

L

PR

IVAT

EC

ATC

HP

IT

ME

SH

LEA

FGU

AR

D

SU

MP

AIR

VE

NT

RE

VE

RS

EB

AC

KD

RO

PO

VE

RFL

OW

PR

IVAT

EC

ATC

HP

ITW

ITH

FLO

WC

ON

TRO

LD

EV

ICE

SU

MP

110m

m O

SM

AD

RA

IN

DIR

EC

TIO

N O

F FL

OW

Typical On-Line Water Storage Detail

AQ

UA

CE

LL/A

QU

AC

ELL

LIT

E

(dep

endi

ng o

n ap

plic

atio

n an

d si

te)

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSOn-Line Water Storage Detail ■ Off-Line Water Storage Detail

STORMWATER MANAGEMENT SYSTEMSTypical Off-Line Water Storage Detail

21


AIR

VE

NT

GR

OU

ND

LE

VE

L

CO

NTR

OL

CH

AM

BE

RW

ITH

FLO

WC

ON

TRO

L D

EV

ICE

INC

OM

ING

PIP

E WE

IRW

ALL

SU

MP

NO

N-R

ETU

RN

FLA

P V

ALV

E

Typical Off-Line Water Storage Detail

AQ

UA

CE

LL/A

QU

AC

ELL

LIT

E

(dep

endi

ng o

n ap

plic

atio

n an

d si

te)




[email protected]

STORMWATER MANAGEMENT SYSTEMSHydraulically Designed On-Line Water Storage System Installed Off-Line

22

AIR

VE

NT

CO

NTR

OL

CH

AM

BE

R

RE

VE

RS

E B

AC

KD

RO

PO

VE

RFL

OW

PIP

E

OU

TFLO

WC

ON

TRO

LD

EVIC

E

SU

MP

INC

OM

ING

150m

mU

LTR

AR

IB

Hydraulically Designed On-Line Water Storage System Installed Off-Line

AQ

UA

CE

LL/A

QU

AC

ELL

LIT

E

(dep

endi

ng o

n ap

plic

atio

n an

d si

te)

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSHydraulically Designed ■ Soakaway Detail with Silt Trap

STORMWATER MANAGEMENT SYSTEMSTypical Soakaway Detail with Silt Trap

23


160m

mO

SM

AD

RA

IN

SIL

T TR

AP

FOR

MIN

IMU

MD

EP

TH O

F C

OV

ER

CO

NTA

CT

WAV

IN

160m

mO

SM

AD

RA

IN16

0mm

OS

MA

DR

AIN

GR

OU

ND

LE

VE

LNotes:For bedding specification information refer to page 14.

The silt trap can be used in conjunction with asoakaway (as shown) or a storage tank.

Typical Soakaway Detail with Silt Trap

AQ

UA

CE

LL/A

QU

AC

ELL

LIT

E

(dep

endi

ng o

n ap

plic

atio

n an

d si

te)




[email protected]

STORMWATER MANAGEMENT SYSTEMSIntroduction to Garastor

24

Development of sites results in a large

proportion of area being covered by

impermeable surfaces such as roofs, car

parks and roads. Surface water run-off

therefore increases up to 80%. Building

Regulations and guidance now requires a

sustainable approach to development,

which minimises the effects of run-off to

that of a greenfield site (20%).

Developed in collaboration with Bryant

Homes, Garastor (polypropylene control

chamber) represents a house by house,

rather than a development wide

approach, to stormwater management.

Garastor controls the flow of water at

source by temporarily storing water under

a soft landscaped area using the AquaCell

system or in the void space under the

floor slab of a residential garage. It

eliminates the need for costly, space-

hungry, on-site communal water-storage

structures or ponds which enables better

use of developable land.

During high intensity rainfall, water from

the roof or hardstanding areas is diverted

via the Garastor control unit into the

storage void. As the storm subsides the

rainwater can be slowly released back

into the main drainage system.

Note: Garastor can be used as a flow control devicefor any AquaCell storage system, no greater than oneunit deep with a discharge of up to 1.4 l/s via the30mm release flow orifice.

Introduction to Garastor®*

Garastor – polypropylene control chamber

Internal view of Garastor

*Garastor is manufactured under licence (Patent Number GB2357093)

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSIntroduction to Garastor ■ Garastor System Overview

STORMWATER MANAGEMENT SYSTEMSGarastor System Overview

25


Garastor System

The Garastor unit is a polypropylene

chamber that connects to a water storage

reservoir. There are two versions of the

Garastor available both of which are

500mm in diameter, the 6SC500 version is

1m deep for garage installations (with a

300mm storage depth capacity) and the

6SC501 is 1.25m deep for use with

AquaCell* (with a 400mm storage depth

capacity). When Garastor is used in

conjunction with an AquaCell tank the

configuration of units must be no deeper

than 1 AquaCell unit.

If site conditions are such that a deeper

Garastor unit is required then the 500mm

Extension Kit (6SC205 – consisting of a

coupler and two ring seals) can be used in

conjunction with a shaft of 500mm Twinwall

cut to suit, to extend the Garastor unit.

* Depending on the application either AquaCell orAquaCell Lite may be used in conjunction with Garastor.For further details contact Wavin Technical Design.

HOW IT WORKS

Storm or surface water flows through two

110mm diameter incoming pipes. If the

flow is light to moderate, the water is

simply stored in the chamber before being

slowly released through a 30mm orifice.

However, if the inflow is heavy, excess

water in the chamber discharges through

a 150mm diameter pipe into the water

storage area (either the undercroft of a

garage or an AquaCell tank). The water is

temporarily stored until the water level

inside the chamber has dropped

sufficiently, and the water can flow out to

the drainage system via the 110mm

outflow pipe.

Inside the Garastor chamber there are

specially designed weir walls that ensure

that the hydraulics of the unit work to the

optimum levels.

KEY BENEFITS

No use of valuable, developable land.

Safer than open/above ground storage structures.

Caters for 1 in 150 year storm.

Spreads cost of water storage over the development period.

Maintenance free, with no moving parts or filters.

Run-off reverts to that of a greenfield site.

Garastor ® System Overview

AquaCell/ AquaCell Lite units




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STORMWATER MANAGEMENT SYSTEMSGarastor Principal Components

26

6SC205Extension Kit

(a shaft of 500mm TwinWall pipe oran Inspection Chamber Shaft (6D938- 3.0m length / 6D934 - 1.5m length)

cut to suit will also be required)

4D943 < 1.2m deep6D931 > 1.2m deepCovers and Frames

500mm diameter

1m (6SC500)1.25m (6SC501)

Garastor6SC500 (for use with garage undercroft)

6SC501 (for use with AquaCell/AquaCell Lite)

6TW141TwinWall S/S Adaptor

(150mm TwinWall socket x 160mm OsmaDrainspigot for connection of 150mm TwinWall pipedirectly into the AquaCell pre-formed socket)

150mm TwinWall Socket

(for connection toother pipe materials,

a small section of150mm TwinWall is

required, alternativelyuse the 150mm

Garastor ConnectionKit (6SC200 –

consisting of a shortsection of 150mmTwinWall pipe and

two ring seals)

6TW142TwinWall D/S Adaptor

(150mm TwinWall socket x 160mm OsmaDrainsocket for connection of 150mm TwinWall pipe

to 160mm OsmaDrain pipe)

6TW145TwinWall S/S Adaptor

(150mm TwinWall socket x 150mm UltraRibspigot for connection of 150mm TwinWall pipe

directly to 150mm UltraRib socket)

6TW148TwinWall D/S Adaptor

(150mm TwinWall socket x 150mm UltraRibsocket for connection of 150mm TwinWall pipe to

150mm UltraRib pipe)

+

Garastor ® Principal Components

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSGarastor Principal Components ■ Garastor Installation Methods

STORMWATER MANAGEMENT SYSTEMSTypical Garastor Installation Methods

27


1. Place the Garastor Unit (6SC500 or

6SC501) on a minimum of 100mm

“as-dug” or granular material. Ensure

that the unit is as close to the garage

undercroft or AquaCell structure as

possible and in a suitable position to

allow pipework connection.

Note: It is important to ensure that the chamber is placed in alevel position and that the invert of the 150mm pipeconnection is level with the base of the concreteundercroft or the base of the AquaCell units.

2. Connect pipework in accordance with

standard pipe installation guidelines.

3. Surround the Garastor unit with

150mm of similar material to that used

for the bedding.

4. Fit relevant cover and frame according

to depth of unit: Up to and including

1.2m deep 4D943, deeper than 1.2m

6D931.

Note: When surrounded by a concrete plinth(150mm x 150mm) the cover can be used in situationswith a loading of upto 30Kn (3 tonnes) i.e. domesticdriveways.

5. Adequate ventilation must be

provided:

- to the garage undercroft using

either air bricks or rainwater

downpipes connected directly into

the storage area.

- to the AquaCell structure using an

air vent (NB. One air vent is

required per 7,500 square metres

of impermeable area to be

drained).

Garastor installation using garage void

Bitumastic paintapplied to walls ofvoid area andunderside of thegarage floor

cover and frame

Wall to retainstorage area

Stored water

75mm thickness ofsmooth finishedconcrete

1200g polythenedamp proofmembrane

50mm sandlayer

Rainwaterpipe (or airbrick) forventilation

Note: The depth of foundations for standard blockand beam garage floors will need to be lowered byapprox. 300mm to accommodate the storagecapacity required.

150mm outflow pipework toundercroft/void

110mminflowpipeworkto chamber

110mmoutflowpipeworkto drainagesystem

Notes: When using Garastor with the undercroft/voidof a garage, it is the responsibility of the designer toensure that the enhancement to the garageundercroft/void and drainage works comply withcurrent prevailing Building Regulations.

Also to prevent softening of the soils below thefoundations or loss of fines leading tosettlement, the void beneath the garage shouldbe lined as follows:

Underneath the concrete base of the voidarea there should be a 1200g polythenedamp proof membrane.Bitumastic paint should be applied to thewalls of the void area and to the undersideof the reinforced garage floor beams.

* Depending on the application either AquaCell orAquaCell Lite may be used in conjunction withGarastor. For further details contact Wavin TechnicalDesign.

Garastor installation using AquaCell*

Cover andFrame AquaCell/AquaCell Lite*

storage tank

Suitable impermeablegeomembrane

Garastor(6SC501)

Garastor (6SC500)

Typical Garastor ® Installation Methods




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STORMWATER MANAGEMENT SYSTEMSCase studies

28

Case studies

The sky’s the limit for WavinPlastics

THE CLIENT:

Birmingham Airport

THE PROBLEM:

To prevent flooding on a new long-stay

car park covered with paving, and help

the Airport to comply with its policy of

sustainable development.

THE SOLUTION:

Over 7,000 AquaCell infiltration modules

were installed on the site providing a

robust and long life infiltration base. A

permeable geotextile was the only other

component required to complete the

installations.

THE QUOTE:

“Wavin’s solution to stormwater

management combines practical and

operational benefits over the alternative

methods available to the developer. Its

system proved to be economically and

functionally favourable whilst providing

storage of over 1,300 cubic metres of

surface water run-off.”

AquaCell passes toughesttests during worst stormsfor 50 years

THE CLIENT:

Ilchester Cheese Company

THE PROBLEM:

Controlling flooding/water on a regularly

flooded area.

THE SOLUTION:

In order to control stormwater at the

Ilchester site, a system which comprised

of 1,352 AquaCell units was installed to

limit the outflow and provide temporary

storage.

THE QUOTE:

“What we have seen at the Cheese

Company over the past fortnight is

evidence of a highly successful system.

The surrounding area is completely

waterlogged with the river only half a mile

down the road. Our site is bone dry - any

risk of damaged land has been alleviated”.

Weathering the storm onBrownfield Land

THE CLIENT:

Graham & Brown Wallcovering

THE PROBLEM:

How to manage/control storm or flood

water on a low lying brownfield site,

adjacent to a river with a history of

flooding, and prevent the leaching of

contaminants into the high water table

from the site which used to be a power

station.

THE SOLUTION:

To collect stormwater from the

development in a trench surrounding the

new factory filled with 2,000 Wavin

AquaCell units clipped together,

encapsulated in a robust fully welded

hydrocarbon resistant geomembrane,

which in turn was wrapped in a non-

woven needle-punched geotextile.

THE QUOTE:

“The 95% void capacity of Wavin’s system

was a key factor for us. The original

proposal for the site was based on

installing stone-filled trenches with a

maximum void capacity of 30%.”

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSCase Study ■ Notes

STORMWATER MANAGEMENT SYSTEMSNotes

29





[email protected]

✁

First Name

Surname

Job Title

Email

Company Name

Address

Town/City County

Postcode

Phone

Mobile

Fax

We would like to keep you updated about new products from Wavin Plastics Ltd.If you would like to receive additional literature or require to be removed from our database, please complete the form below. Alternately all literature is available to downloadfrom www.wavinpdfs.co.uk All valid records on the Wavin database areentered into a monthly draw for a case of wine.

Please tick type of organisation (One only)

Would you like more info?

I would like further information on:

OSMA Rainwater systems

OSMA Soil & Waste systems

OSMA Flexible Plumbing systems

OSMA Underfloor Heating systems

OSMA Below Ground Drainage systems

OSMA Water Management systems

OSMA Ducting systems

OSMA Pressure Pipe systems

Please return to:

Wavin Plastics LimitedParsonage Way Chippenham Wiltshire SN15 5PNwww.wavin.co.uk

Architect

Builder

Cladder

Client Organisation

Civil Consulting Engineer

Civil Contractor

Design & Build

Environmental Consultant

Gas Utility Contractor

Groundworker

Housing Association

House Builder (under 20 units per annum)

Housing Developer

H & V Contractor

Irrigation Contractor

Land Drainage Contractor

Landfill & Waste Disposal

Local Authority

Major Construction Company

Multi-Utility Contractor

M & E Contractor

M & E Consulting Engineer

Plumber

Quantity Surveyor

Roofer

Utility Company

Water Utility Contractor

Wavin Plastics Ltd do not sell or provide data toother organisations for direct mail purposes.

www.wavin.co.uk

STORMWATER MANAGEMENT SYSTEMSNotes ■ Technical ■ Further Information

STORMWATER MANAGEMENT SYSTEMSTechnical Assistance ■ Further Information

31

Contents

WAVIN ONLINEThe complete OSMA product catalogue, together with design and

installation guidance, is also available online at: www.wavin.co.uk

All literature can be downloaded via the searchable PDF library at

www.wavinpdfs.co.uk

Wavin images can be downloaded at different resolutions from

www.wavinimages.co.uk

OSMA Stormwater Management systems

are backed by Wavin’s comprehensive

technical advisory service. This is available

to provide expert assistance at every stage

of a project, from planning and product

selection to installation and maintenance.

Services include:

Full technical literature, including:

- System Product Guides

- Design and Installation Guides

- Trade Price Lists

Contact Wavin Technical Design

Department for prompt assistance:

TECHNICAL DESIGNTel: 01249 766655Fax: 01249 766653Email: [email protected]

To request a copy of any item(s) of current

literature, please contact:

LITERATURE REQUESTSTel: 01249 766333Fax: 01249 766332Email: [email protected]

Technical Adviceand Assistance Further Information

STORMWATER MANAGEMENT SYSTEMSThe following related publications are available for OSMA

Stormwater Management systems:

Design and Installation Manual

Trade Price List

ASSOCIATED OSMA SYSTEMSOSMA systems are fully integrated to provide a total

solution for above and below ground drainage,

plumbing and heating. Contact Wavin Technical

Design Department for further details regarding:

OSMA Rainwater systems


OSMA Flexible Plumbing systems


OSMA Below Ground Drainage

systems

OSMA Water Management

systems


OSMA Pressure Pipes for

Water

OSMA Pressure Pipes for

Gas


Wavin Plastics LimitedParsonage Way Chippenham Wiltshire SN15 5PN

Tel: 01249 766600Fax: 01249 443286

Email: [email protected]

All OSMA systems are backed by fulltechnical literature and project support.See inside back cover for details.

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 ingood faith, and believed to be correct at the time of going to press. However, no responsibility can be accepted forany errors, omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for thepurpose and application intended.

ISO 9001:2000

Stormwater Management SystemsAquaCell®, AquaCell Lite® & Garastor®

Product andInstallation Guide

Meeting your needsOSMA Water Management systems, developed by WavinPlastics Limited, form part of a comprehensive range of plasticsystems to provide intelligent solutions for all building, constructionand utilities projects.

These include:

Above Ground ProjectsOSMA Rainwater systems


Plumbing & Heating ProjectsOSMA Flexible Plumbing systems


Below Ground ProjectsOSMA Below Ground Drainage systems

OSMA Water Management systems


Pressure Pipe ProjectsOSMA Pressure Pipes for Water

OSMA Pressure Pipes for Gas

www.wavin.co.uk

WM

420

Water UK Partner – supporting informationand learning in the water industry

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

www.intelligentosma.co.uk

Aqua Cell Water Management System

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