intesio-aquacell · page 7 overview of aquacell® systems acceptance – british board of...

CI/SfB (52.5) (90.51)

May 2009/rev February 2010 WM424

Uniclass EPIC JR12/JS10 L731/L71121/L2123 J3413 X721

Intelligent stormwater solutions by Wavin

For residential, commercial, industrial and infrastructure applications

Infiltration and Attenuation Systems

Product and Installation Guide

www.intesio.co.uk

Contents

Wavin operates a programme of continual product development, and therefore reserves the right to modify or amend the specifi cation 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.

Infiltration and Attenuation

Introduction 4-5

Intesio - For Optimum Stormwater Management 4

AquaCell Systems 4

Garastor System 5

Overview 6-7

Overview of AquaCell Systems 6-7

Applications 8-11

AquaCell Plus for Deeper installations 8-9

AquaCell Core for Trafficked installations 10

AquaCell Lite for Landscaped and Non-Trafficked Sites 11

AquaCell Systems 12-13

Principal Components 12

Ancillary Components 12

System Selector 13

Design and Installation 14-18

Design and Installation Guidance 14-15

Typical Soakaway Installation Method 16

Typical Storage Tank Installation Method 17

Silt Trap 18

Air Vent Design 18

Typical Connections 19-21

Typical Connections to AquaCell Units 19

Typical Air Vent Connections 20

Typical Connection Configurations 21

Typical Details 22-31 Soakaway - Non-Traffic Loading 22

Soakaway - Highway 23

On-Line Storage - Box Feed 24

On-Line Storage - Manifold Feed 25

On-Line Storage - Central Pipe Feed 26

On-Line Storage - Manifold Feed with Bypass 27

Off-Line Storage - Box Feed 28

Off-Line Storage - Manifold Feed 29

Off-Line Storage - Central Pipe Feed 30

Soakaway or Storage Tank - With Silt Trap 31

Garastor System 32-35

Introduction 32

Overview 33

Principal Components 34

Typical Installation Methods 35

Customer Services Technical Enquiries Technical Fax Email01249 766611 01249 766655 01249 766653 [email protected] 4

Infi ltration & Attenuation Systems – Introduction

Intesio – for optimum stormwater management

Continuing urban development, a changing climate and the

consequences of intensifi ed rainfall: all are increasingly prominent

issues on the political and environmental agenda. In combination,

they represent a complex need for the most intelligent, effective

solution.

Intesio is Wavin’s specialist approach to responsible management

of stormwater, including its effi cient capture, transportation,

cleansing, infi ltration, attenuation and re-use. We’re ready to

contribute at any stage in a project, with one central goal: to help

achieve the optimum project outcome. Our in-depth expertise,

design insight and proven system technology is applied wherever

required to ensure each installed scheme achieves maximum

effi ciency of cost and integrated function, and full compliance with

the latest regulatory criteria.

Intesio 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 Plus (light blue unit) inspectable, for use in deep

traffi cked locations.

• AquaCell Core (blue unit) for traffi cked locations.

• AquaCell Lite (green unit) for landscaped and non-traffi cked

sites.

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 infi ltration 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 pages 8, 9, 10

& 11).

With Intesio AquaCell systems, however, the required strength and

hydraulic capabilities have been verifi ed by independent testing.

AquaCell Plus

AquaCell Core

AquaCell Lite

www.intesio.co.uk

Infi ltration & Attenuation Systems – Introduction

AquaCell Lite soakaway

Garastor® System*

A polypropylene fl ow 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 Core or AquaCell

Lite may be used in conjunction with Garastor. For further details

contact Wavin Technical Design.

Note: Garastor can be used as a fl ow control device for any

AquaCell storage system, no greater than one unit deep with a

discharge of up to 1.4 l/s via the 30mm release fl ow orifi ce.

* Garastor is manufactured under licence (Patent Number

GB2357093).

Garastor System

Garastor domestic storage using AquaCell Core tank

Garastor domestic storage using garage void

Large scale AquaCell Core storage tank

Domestic AquaCell Core soakaway

The AquaCell Stormwater Management System

Comprises individual infi ltration 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 fl owing 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 outfl ow

and providing temporary storage or where the ground conditions

are suitable, providing soakaways for the stormwater to infi ltrate

back into the surrounding ground. This has the added benefi t of

recharging the local groundwater.

Both options can be achieved using either the AquaCell Plus,

Core or Lite systems depending on the application.


Overview of AquaCell® Systems

AquaCell systems are a fully tried and tested modular technique

for managing excessive rainfall. Units are assembled to create

an underground structure as either temporary storage tank or

soakaway.

There are 3 types of unit:

AquaCell Plus

for extra deep installations and/or inspectability (pages 8-9)

AquaCell Core

for traffi cked locations (page 10), and

AquaCell Lite

for landscaped and non-traffi cked locations (page 11)

For quick, versatile assembly

The lightweight polypropylene, high void units are securely linked

together using special clips and shear connectors.

They can be assembled quickly on site into whatever

confi guration suits each specifi c location.

AquaCell Core and Lite geocellular systems also allow ‘brick-

bonding’, which can give extra stability, without the need for

additional connector pieces.

Wrapped for infi ltration or storage

The complete assembly is wrapped in either geotextile sheet or a

geomembrane:

For pervious soils, the geotextile option allows infi ltration of

stormwater into the surrounding ground.

For impervious ground (e.g. clay) or where infi ltration is not

desirable, the geomembrane holds stormwater in temporary

storage until local drainage fl ows can accept it for normal

disposal.

Benefi ting community and environment

AquaCell systems contribute the following benefi ts:

Signifi cantly reduced fl ooding risk•

Controlled, reduced-volume release of stormwater into existing •

sewer systems or watercourses

Recharging of local groundwater (if infi ltration/soakaway •

application)

Aerobic purifi cation to improve water run-off quality•

Sustainable, cost effective management of the water •

environment

Helping SUDS and planning approval

The proven qualities and performance of AquaCell systems

not only support the achievement of SUDS, they can also

help reinforce and enhance planning applications, and enable

development to proceed.

Types of Connections

There are a number of ways to provide a controlled feed into the

AquaCell units to suit the required fl ow capacity.

These being:

Manifold Confi guration – this confi guration utilizes standard 1.

pipe and fi ttings (see page 21)

Box Confi guration – this confi guration utilizes the AquaCell Core 2.

units (see page 21)

Central Pipe Confi guration – this confi guration utilizes standard 3.

perferated TwinWall pipe and fi ttings (see page 21)

www.intesio.co.uk

Overview of AquaCell® Systems

Acceptance – British Board of Agrément

The Intesio Infi ltration and Attenuation systems, AquaCell Plus,

Core and Lite have been awarded British Board of Agrément

approval under BBA Agrément Certifi cate No.03/4018.

The certifi cate covers the design data, technical specifi cation,

installation and maintenance aspects for each unit as follows:

AquaCell Core

– approved under BBA Agrément

Certifi cate No.03/4018, Detail Sheet 1

AquaCell Lite



AquaCell Plus



Construction Industry Research and Information

Association (CIRIA)

CIRIA publishes structural design information for modular geocellular drainage tanks

CIRIA has produced Guidance Document C680 “Structural design

of modular geocellular drainage tanks”...

This document has been produced to ensure that engineers

have the required information to establish that a proposed

underground structure is capable of remaining structurally sound

and operational in traffi cked situations over the lifetime of the

construction.

C680 asserts that engineers should satisfy themselves of

the suitability of the proposed construction, and not rely on

manufacturer’s recommendations. Intesio AquaCell has been fully

tested in accordance with the requirements of C680 and we can, if

required, provide structural calculations for our system within our

designs from an independent consultant.


AquaCell Plus for Deeper Installations and/or for Inspectability

For any installation where extra depth and/or inspectability is required.

AquaCell Plus has been developed and engineered to add extra

design scope for AquaCell installations. The units can be used in

combination with AquaCell Core (and with Lite if there is at least

one layer of AquaCell Core in between the Plus and Lite Layer).

Extra lateral loading capacity allows installation at greater depths.

Integral inspection channels in each unit can combine to create

viewing channels for the full length of the installed structure.

PROVEN LOADING CAPACITY

Vertical: 65 tonnes/m2•

Lateral: 8.55 tonnes/m2•

INSTALLATION DEPTH

Maximum to base of units*:•

5.08 metres

*in best soil conditions

OTHER FEATURES

Specifi c to AquaCell Plus:

Distinctive LIGHT BLUE colour – for ease of inspectability•

Integral inspection tunnel•

Approvals: BBA No.03/4018 Detail Sheet 3•

AquaCell Plus: solus – or in combination

AquaCell Plus may be used on its own – or in combination with

AquaCell Lite* and/or AquaCell Core.

*AquaCell Lite can only be used in conjunction with AquaCell Plus,

if there is at least one layer of AquaCell Core inbetween the Plus

and Lite layer.

Extra deep installations

Non-trafficked areas

Trafficked areas

End cap for when an inspection channel is not required

AquaCell Plus6LB200

www.intesio.co.uk

AquaCell Plus for Deeper Installations and/or for Inspectability

AquaCell Plus: for extra depth and/or inspectability.

The extra lateral loading capacity of AquaCell Plus means it can

be used at a greater depth (maximum 5.08m). This may be on

its own – or in combination with AquaCell Core, which has a

maximum permitted depth of 4.25m (4.1m if traffi cked).

AquaCell Plus: for inspectability

By aligning AquaCell Plus units end-toend, full length viewing

channels can be created – allowing for CCTV inspection if

required. These are created in the bottom layer of an AquaCell

tank installation.

AquaCell Plus units may be installed alongside other AquaCell

units, as in the examples shown.

Wavin recommends that a minimum of three inspection tunnels

are created – at the inlet point (at or near the tank centre line) and

at the two outer edges of the structure. An inspection chamber

should be installed for each tunnel.

NOTE: For any AquaCell Plus units on the perimeter of a structure

that are NOT required for inspection access, the open ends of

the integral inspection tunnels should be fi tted with the end caps

provided.

Inspection chambers

An inspection chamber should precede the inlet pipework for the

AquaCell structure:

For on-line installations:

– (down to 3m) Intesio Non-Entry Inspection Chamber [NIC] or

– (down to 5m) Intesio Tegra 600 Inspection Chamber or

– Traditional manhole*

*where inlet pipework is replaced by AquaCell units acting as fl ow

conduit).

A silt trap prior to the inspection chamber is also recommended.

For off-line installations:

– Traditional manhole with in-built fl ow control

For non-inlet inspection points, use Intesio Non-Entry Inspection

Chamber [NIC] or Intesio Tegra 600 Inspection Chamber only.

RECOMMENDATION: If installing Intesio Non-Entry Inspection

Chamber [NIC] or Intesio Tegra 600 Inspection Chamber,

regardless of depth, ensure the cover and frame includes a

350mm restrictor to prevent man entry.

Inspection and maintenance

CCTV inspection at every inspection point is recommended:

– after every major storm

– at regular intervals according to the specifi c maintenance plan

for the site

Silt traps prior to inlet pipework should be routinely inspected and

cleaned out to minimise debris reaching the tank. It is important to

prevent construction silt from entering the AquaCell structure.

Inspectability scenarios

AquaCell Core and AquaCell Plus

Trafficked tank installation with inspection channels


AquaCell Core is ideal for areas subject to regular and heavy traffi c loading, and particularly for larger projects.

Specifi ers, developers and contractors can now choose the right

product to suit each situation. The original AquaCell Core (blue

unit) has already proved its versatility and functional performance

advantages in large projects designed to satisfy demanding

criteria for sustainable drainage. Examples of projects utilising

AquaCell 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 traffi c loading is NOT anticipated, AquaCell Lite

(green unit) should be selected (see page 11).

In addition to features and benefi ts applicable to BOTH systems

those specifi cally applicable to traffi ckable AquaCell Core (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 confi gurations and applications, including both •

shallow and deeper installations – Ideal for all sizes of project

including major attenuation schemes

AquaCell Core for Traffi cked Sites

AquaCell Core 6LB100

Typical applications

Industrial/commercial areas

Residential developments

Roads

Car parks

www.intesio.co.uk

AquaCell Lite for Landscaped and Non-traffi cked Sites

Typical applications

Domestic gardens

Grassed and leisure areas

Roundabouts

Domestic back gardens

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

This now enables specifi ers, developers and contractors to

choose the right product to suit each situation.

AquaCell Lite (green unit) offers all the proven installation

versatility and functional performance advantages of AquaCell

Core (see page 10), but has been specifi cally engineered to

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

In addition to features and benefi ts applicable to BOTH systems

those specifi cally 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•

Specifi cally designed for restricted depth, low-loaded, •

landscaped sites:

– Ideal for smaller projects

Note: NOT suitable for locations subject to high watertable.

AquaCell Lite 6LB050


AquaCell Systems – Principal Components

* 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)

6LB600 Silt Trap

(Use Extension Kit if required)

6D129OsmaDrain S/S Adaptor –

Thinwall Clay Spigot

(For use with 6D916 when

connecting to a BS EN 295

Thinwall Clay Spigot)

6LB106**225mm Flange Adaptor

(To connect to 225mm UltraRib)

6LB104*150mm Flange Adaptor

(Adaptor to be used at points

other than pre-formed socket

to connect to 150mm UltraRib)

4D916160mm OsmaDrain

P/E Adaptor

(Fits into pre-formed socket

as an extension connection

piece)

6LB105Clip

(Used to hold

units together

horizontally)6LB102

Shear Connector

(Used to hold units

together vertically)

6D099OsmaDrain S/S Reducer

160mm x 110mm (fits into

pre-formed socket to connect

to 110mm OsmaDrain)

6TW141TwinWall S/S Adaptor

(Fits into pre-formed socket to

connect to 150mm TwinWall)

6UR141UltraRib S/S Adaptor

(Fits into pre-formed socket

to connect to 150mm

UltraRib)

AquaCell Plus Unit 6LB200

AquaCell Lite Unit 6LB050

AquaCell Core Unit 6LB100

Note : All components on this page are not shown to scale

6SC205Extension Kit

Note: All AquaCell units (Lite, Core and Plus) have identical dimensions: 1m (L) x 0.4m (H) x 0.5m (W)

Principal Components

Ancillary Components

All ancillary components can be used with either the AquaCell

Lite, Core or Plus units, except the 225mm Flange Adaptor

(6LB106) which must only be used with AquaCell Plus or Core.

The 150mm Flange Adaptor (6LB104) should only be

used when constructing an air vent on the top surface of

an AquaCell Lite unit. The adaptor should not be used to

connect inlet pipes to the side of the AquaCell Lite unit.

www.intesio.co.uk

AquaCell Systems – System Selector

The following selector will help you to determine which AquaCell system, or combination of systems,

is the correct choice for a particular project.

NO YES NO YES

Will the tank be more than 4.25m deep?

Will the tank need to be installedextra deep (ie deeper than 4.1m

in ideal soil conditions)?

NO YES

Will the tank be more than 1.5m deep?

NO YES

Will both tank length and width bemore than 12m?

NO YES

Does the site have a high water table?

NO YES

Will the site be subject to traffic loading?

Use:

Lite up to 1.5m

Use:

Core up to 4.1m

Use combination of:

Core up to 4.25m

Lite up to 1.5m Lite up to 1.5m

Use combination of:

Core

Plus up to 5.08m

up to 4.25m

Use combination of:

Plus up to 4.78m

Core up to 4.1m

Lite AquaCell Lite (6LB050)

Core AquaCell Core (6LB100) See pages 8 and 9

See pages 6 and 7

See pages 10 and 11Plus AquaCell Plus (6LB200)

AquaCell Lite and AquaCell Plus cannot be used directly together.

If the tanks need to be inspectable contactWavin Technical Design on 01249 766655.

Notes:


Hydraulic and Structural Design

All AquaCell system units have

identical dimensions: 1m x

0.4m x 0.5m, with a nominal

void ratio of 95%. Hydraulic

calculations are accordingly

the same for AquaCell Core, Lite

and Plus.

Structural design, however,

requires careful consideration

of loading factors specific to

each location.

Minimum cover depth

AquaCell AquaCell AquaCell Location type Lite Core Plus

Landscaped/non-trafficked areas 0.3mb 0.5m 0.5m

Car parks, vehicle up to 2500 kga

gross mass , with AquaCell system

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

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

Maximum depth to base of unit 1.5m 4.25mc 5.08m

Installation and Cover Depths

After deciding which AquaCell

system is correct for the project

location (using the Product

Selector on page 13), see

Table for the recommended

maximum installation depths

and minimum cover depths.

The Mixing the units together

diagram also shows the depth

parameters for each system,

and so gives guidance on

combining two or more of the

AquaCell systems.

AquaCell Systems: Installation Depths

Each AquaCell system has

been designed to have specific

loading capacities (see pages

8, 9, 10 & 11) that define the

depth parameters for which

they are suitable.

Minimum depth of cover varies

according to whether or not the

installation will be subject to

trafficking by motor vehicles/

HGVs. In each case, the cover

depths shown in the diagram

include both absolute minimum

and recommended minimum

cover depths.

In some situations, installations

have to be located at much

deeper levels with significantly

greater cover depths. Reasons

may include:

Landscaped installation Trafficked installation

0.3-0.5mminimum

cover depth

0.6-0.75mminimumcover depth

4.1m

4.78m

1.5m

4.25m

5.08m

a For specific advice on cover depths for heavier loadings/HGV applications, contact Wavin

Technical Design on 01249 766655.

b 0.3 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, extra protection may be needed.

c 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.

• Deep-running drainage

network

• Other buried services running

above tank location

• Installation into banked/

sloping ground

• Upper layer of clay

preventing infiltration

Lite Core Plus

Mixing the units together

Design and Installation Guidance

www.intesio.co.uk

Design and Installation Guidance

Geocellular Structures

Important design considerations

To guarantee the structural integrity of an engineered drainage

system, 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:

Depth of cover (See page 14)

Soil type

Surface finishing

Presence of groundwater

Type of traffic/loading

AquaCell Lite: Additional Installation Guidance

Because of 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 AquaCell units. Therefore 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 should be 500mm well-compacted

granular material

• Excavators MUST NOT weigh more than 14 tonnes, and

compaction plant must not exceed 2300 kg per metre width

• HGVs MUST NOT 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: 2300 kg per metre width

Ancillaries and Adaptors

All ancillaries and adaptors (see page 12) can be used with either

the AquaCell Plus, Core or Lite units, except the 225mm Flange

Adaptor (6LB106) which must only be used with AquaCell Plus/

Core.

The 150mm Flange Adaptor (6LB104) should only be used when

constructing an air vent on the top surface of an AquaCell Lite

unit. The adaptor should not be used to connect inlet pipes to the

side of the AquaCell Lite unit.

The combination of these 5 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. Two typical

examples are given below.

1

2

3

4

5

1

5

2

3

4

EXAMPLE A:

Car park with occasional

lorry traffic and 0.6m cover

depth. Typically requires

minimum vertical strength

of 40 tonnes/m2

EXAMPLE B: Landscaped/

non-trafficked location

and 0.3m cover depth.

Typically requires minimum

vertical strength of 17.5

tonnes/m2

These factors have already been taken into consideration within

the product selector on page 14 for the 3 AquaCell systems.


Typical Soakaway Installation Method

Permeable geotextile*

Pre-formed socket

AquaCell Plus/AquaCell Core/AquaCell Lite Units

100mm

100mm

100mmCoarse sand or non angular granular material base and surround

Typical Installation Procdedure

1. Excavate the trench to the required depth ensuring that the plan area is slightly greater than

that of the AquaCell 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 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 Silt Trap (6LB600) is installed prior to the inlet

pipework - see page 18 for installation guidelines.

7. Wrap and overlap the geotextile covering the entire AquaCell structure.

8. Lay 100mm of coarse sand or non angular granular material between the trench walls and

the AquaCell 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.

Example shows the use

of AquaCell Lite. However a

soakaway can also be installed

as shown using AquaCell Plus

or Core as appropriate.

* The geotextile should be selected

according to specific site conditions.

Typically, however, a 300g material

will be suitable. Specialist advice

should be sought if surrounding soil

characteristics exhibit a high degree

of fines/low infiltration capacity and/

or there is a high risk of damage

from ground contaminants.

www.intesio.co.uk

Typical Storage Tank Installation Method

Suitable impermeable geomembrane

Suitable protective geotextile layer

Pre-formed socket

AquaCell Core/AquaCell Lite/AquaCell Plus Units

100mm

100mm

100mmCoarse sand or non angular granular material base and surround

Example shows the use of

AquaCell Core, however a

storage tank can also be

installed as shown using

AquaCell Plus or Lite as

appropiate.

* For large scale, deep installations

a 1mm thick geomembrane is

recommended and joints should be

sealed using proprietary welding

techniques. However, for shallow,

domestic installations it may be

suitable to use a geomembrane

with taped joints. For further details


Typical Installation Procedure

1. Excavate the trench to the required depth ensuring that the plan area is slightly greater

than that of the AquaCell 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 structure and seal to manufacturers

recommendations.*

7. If side connections into the AquaCell units is required, (other than the preformed socket),

use the appropiate Flange Adaptor (6LB104 or 6LB105). Fix the flange adaptor to the unit

using self-tapping screws. Drill a hole through the Flange Adaptor and connect the

pipework.

8. In order to prevent silt from entering the tank, clogging inlet pipework and reducing storage

capacity, it is recommended that the Silt Trap (6LB600) is installed prior to the inlet

pipework – see page 18 for installation guidelines.

9. Wrap and overlap the geotextile covering the entire AquaCell structure, to protect the

geomembrane.

10. Lay 100mm of coarse sand between the trench walls and the AquaCell 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 18 for design.


Typical Installation: Silt Trap and Air Vent Termination

COVER & FRAME

150mm side fill as dug material with no particle sizes larger than 40mm

100mm bed as per pipe bedding specification

160mm OsmaDrain Inlet/Outlets or use the appropriate adaptor

450mm

1250mm

SHAFT 500mm

Typical Air Vent Design

Silt Trap

Balloon Grafting

Flange Connector (6LB104)

Ventilation Box

110mm OsmaDrain Pipe150mm x 110mm Reducer (6UR099)

Aquacell Plus/Core/Lite Units

Geomembrane sealed to Flange

Typical installation procedure

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 system 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.

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

The silt trap can be extended (if required) using the 500mm Extension Kit (see details on page 34) in conjunction with a 500mm shaft of TwinWall cut to suit.

Note: It is recommended that one vent pipe, 110mm in diameter, is provided per 7,500 square meters of impermeable catchment area on a site. Please contact Wavin Technical Design for further details.

www.intesio.co.uk

Typical Connections to AquaCell Units

*Note: For pipework other than 160mm

OsmaDrain, these adaptors can be used to

connect to the following:

• 6TW141: TwinWall S/S Adaptor connects

to 150mm TwinWall

• 6D099: OsmaDrain Adaptor connects

to 110mm OsmaDrain

• 4D916: OsmaDrain PE Adaptor connects

to 160mm OsmaDrain

• 6UR141: UltraRib S/S Adaptor connects

to 150mm UltraRib

• 6D128: OsmaDrain S/S Adaptor

connects to 150mm thinwall clay. (needs

to be used in association with 4D916

Adaptor)

AquaCell Plus

AquaCell Core

AquaCell Lite

Jubilee clipPermeable

Geotextile Wrap

150mm pipework to suit

Coarse Sand or Non-Angular Granular Material Base and Surround

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 fl ange plate toensure a watertight seal.

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

Connection for soakaway application using either the pre-formed

socket (as shown below) or standard adaptors into pre-formed socket*

Connection for storage application using Flange Adaptor at points

other than pre-formed socket, (for AquaCell Plus/Core only).

150mm pipework to suit

Coarse Sand or Non-Angular Granular Material Base and Surround

AquaCell Plus/Core Only

Geomembrane Wrap

Flange Adaptor (6LB104/6LB16)

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.


Typical Air Vent Connections

Typical installation procedure:

1. Fix Flange Adaptor to the AquaCell tank

with self-tapping screws.

2. Drill through geomembrane and AquaCell

unit with a long 150mm Crown Drill Bit

Cutter.

3. Insert pipework into Flange Adaptor to

form air vent.

Top Connection for Air Vent

Connect into the top of the AquaCell unit, using Flange Adaptor.

Geomembrane wrap

Connect suitable pipework to form air vent

Flange Adaptor (6LB104)

Coarse sand or non angular granular material base and surround

AquaCell Plus

AquaCell Core

AquaCell Lite

Geomembrane wrap

Jubilee clip


OsmaDrain S/S reducer (6D099)

Suitable bend and pipework to form air vent

Side Connection for Air Vent

Connect into the side of the AquaCell tank unit using standard OsmaDrain

Reducer (6D099).

AquaCell Plus

AquaCell Core

AquaCell Lite

Typical installation procedure:

1. Fix OsmaDrain Reducer to the AquaCell

tank with self-tapping screws.

2. Drill through geomembrane and AquaCell

unit with a long 150mm Crown Drill Bit

Cutter.

3. Insert pipework into OsmaDrain Reducer

to form air vent.

www.intesio.co.uk

Typical Connection Configurations

Introduction

The connections shown here in schematic form, are the 3 options used to connect

AquaCell box unit assemblies to control chambers. They provide a controlled feed

into and out of the AquaCell box unit assemblies, and are used for either infiltration or

attenuation schemes.

Manifold Connection(Using standard pipes and fittings)

Box Connection(Using AquaCell Core units for fast

water transfer)

Central Pipe Connection(Using standard perforated TwinWall

pipe and fittings)

150mm/225mm UltraRib

Pipe

Cover and frame

Precast concrete chamber sections and cover slab

150mm concrete surround

PipeSump

Cover and frame


150mm concrete surround Perforated TwinWall pipe

PipeSump

14mm - 20mm single size granular bedding /backfill material



AquaCell box unit assembly




Note: The configuration of pipes in a manifold arrangement will vary to suit site conditions and aniticip[ated stormwater intensity.

See pages 25, 27 and 29 for this option in context.

Note: See pages 24 and 28 for this option in context.

Note: See pages 26 and 30 for this option in context.

Sump

Cover and frame


Typical Details: Soakaway - Non-Traffic Loading

Notes

1. Soakaways should

be sited at least 5m

away from the building

(Ref BS EN 752-4)

2. The exact size

and shape of the

soakaways are to

be determined once

all the necessary

calculations have

been produced.

* For information

regarding cover depths

and installation depths,

see page 14.

S

Key

= AquaCell units soakaway

(See note 2)

S

S

Deep Soakaway

Non-traffic load areaMin depth*

Installationdepth*

AquaCell Plus

AquaCell Core

AquaCell Lite

Ground level

Trench Soakaway

Non-traffic load area

AquaCell Plus

AquaCell Core

AquaCell Lite

Min depth*

Installationdepth*

Ground level

www.intesio.co.uk

Typical Details: Soakaway - Highway

For minimum depth of cover contact Wavin

AquaCell Plus and AquaCell Core only

225mm UltraRib

150mm UltraRib

To road gully

Footpath Finished road level

150mm Concrete surround

Silt trap


Typical Details: On-Line Storage - Box Feed

Cover and frameCover and frame


Water flow

Water flow

150mm concrete surroundPrecast concrete chamber sections and cover slab


Flow control

Typical vent detail

Open grating

Ventilation box

A

ASump Sump

AquaCell unit assembly Coarse sand or non angular granular material base and surroundLong Section

What Happens to the Water?

1. The water level in the upstream control chamber rises.

2. Then, during a storm event, the AquaCell box unit

storage assembly quickly fills with water via the box feed

connection.

3. After storm event, water flows back out of the AquaCell

box unit storage assembly, finding its own level, and into

the downstream control chamber.

4. The water then flows through the vortex flow control valve.

Cross Section A-A AquaCell Plus units used as the lower layer

Geomembrane wrap with outer protective geotextile wrap AquaCell Core units

Downstream control chamberUpstream control chamber

Plan

AquaCell unit assembly

Water flow

Water flow

Sump

Cover and frame Flow control

www.intesio.co.uk

Typical Details: On-Line Storage - Manifold Feed

Water flow

Water flow





Flow control

Typical vent detail

Open grating

Ventilation box

A

ASump Sump

AquaCell unit assembly Coarse sand or non angular granular material base and surroundLong Section



2. During a storm event, the AquaCell box unit storage

assembly fills with water via the manifold feed connection.


box unit storage assembly, finding its own level, and into

the downstream control chamber.


Cross Section A-A

Geomembrane wrap with outer protective geotextile wrap AquaCell Core units

AquaCell Plus units used as inspection access

Downstream control chamberUpstream control chamber

Plan

Water flow

Water flow


Sump

3-pipe manifoldCover and frame Flow control


Typical Details: On-Line Storage - Central Pipe Feed

Wrap the entire AquaCell unit assemblieswith a geotextile wrapping as appropriate

Geomembrane to perimeter of constructonCross Section A-A


14mm - 20mm single size granular bedding/backfill material



2. AquaCell box unit storage assemblies fill with water via the central pipe connection and

percolation through the granular bedding material.

3. After storm event, water flows back out of the AquaCell box unit storage assemblies, finding

its own level, and into the downstream control chamber.


Water flow

Water flow



Wavin TwinWall half-perforated pipe



Flow control

Typical vent detail

Open grating

Ventilation box

A

ASump Sump


Long Section

Upstream control chamber Downstream control chamber

Plan


Flow control

Water flow during storm event Water flow after storm event

Water flow

Water flow

Sump

Cover and frame

www.intesio.co.uk

Typical Details: On-Line Storage - Manifold Feed with Bypass


1. When storm conditions are high, the water level in the

upstream control chamber rises.

2. The AquaCell tank unit assembly also fills with water to its

designated capacity.

3. The excess water is taken up by the bypass pipe and

guided to the downstream control chamber, to prevent

overloading of the AquaCell tank unit aasembly.

4. As the storm event subsides, the water in the AquaCell tank

unit assembly flows back out, finding its own level, and also

discharges into the downstream control chamber.

5.The water then flows through the vortex flow control valve.

Water flow

Water flow






Flow control

Typical vent detail

Open grating

Ventilation box

Sump Sump

Bypass pipe


Geomembrane wrap with outer protective geotextile wrap


Manifold pipe arrangementLong Section

A

A

Cross Section A-A

Geomembrane wrap with outer protective geotextile wrap Bypass pipe

Water flow

Water flow

Bypass pipe

Upstream control chamber

Downstream control chamber


Plan


Flow control Cover and frame

Sump


Typical Details: Off-Line Storage - Box Feed


1. Control chamber fills with water, up to the top of the

weir wall.

2. The water overflows the weir wall and enters the AquaCell

box unit storage assembly via the box connection.

3. AquaCell box unit storage assembly fills with water.


box unit storage assembly, finding its own level, and

through the non-return flap valve at the bottom of the

weir wall.


Water flow

Cover and frame


Flow control

Weirwall

Typical vent detail

Open grating

Ventilation box

Sump

Non-return flap valve




Long Section

A

A

Cross Section A-A


Cover and frame


Precast concrete chamber sections

Flow control

Weirwall

Plan


Water flow

Water flow

www.intesio.co.uk

Typical Details: Off-Line Storage - Manifold Feed


1. Control chamber fills with water, up to the top of the

weir wall.

2. The water overflows the weir wall and enters the AquaCell

box unit storage assembly via the manifold connection.



box unit storage assembly, finding its own level, and

through the non-return flap valve at the bottom of the

weir wall.



Water flow

Cover and frame



Flow control

Weirwall

Typical vent detail

Open grating

Ventilation box

Sump




Long Section

A

A

Cross Section A-A


Cover and frame


Precast concrete chamber sections

Flow control

Weirwall

Plan


Water flow

Water flow


Typical Details: Off-Line Storage - Central Pipe Feed

Water flow

Cover and frame



Flow control

Weirwall

Typical vent detail

Open grating

Ventilation box

SumpWavin TwinWall half-perforated pipe

A

A




Long Section


1. Control chamber fills with water, up to the top of the weir wall.

2. The water overflows the weir wall and enters the AquaCell box unit storage assemblies via the

central pipe connection and percolation through the granular bedding material.


4. After storm event, water flows back out of the AquaCell box unit storage assemblies, finding

its own level, and through the non-return flap valve at the bottom of the weir wall.

5. The water then flows through the vortex flow control valve

Cross Section A-A

Wrap the entire AquaCell unit assemblieswith a geotextile wrapping as appropriate

14mm - 20mm single size granular bedding/backfill material

Geomembrane to perimeter of constructon

Plan

Flow control

Water flow

Water flow

Wavin TwinWall half-perforated pipe 14mm - 20mm single size granular bedding/backfill material

Water flow during storm event Water flow after storm event

www.intesio.co.uk

Typical Details: Soakaway or Storage Tank - With Silt Trap

Notes

For bedding specification information refer to page 16-17.

The silt trap can be used in conjunction with a soakaway (as

shown) or a storage tank.

For minimum depth of cover contact Wavin

AquaCell Plus

AquaCell Core

AquaCell Lite

Ground level

160mm OsmaDrain

160mm OsmaDrain

160mm OsmaDrain

Silt trap

(Choice depends on application and site conditions)


Introduction to Garastor*

The 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 greenfi eld 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 fl ow of water at source by

temporarily storing water under a soft landscaped area using the

AquaCell system or in the void space under the fl oor slab of a

residential garage. It eliminates the need for costly, spacehungry,

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 fl ow control device for any

AquaCell storage system, no greater than one unit deep with a

discharge of up to 1.4 l/s via the 30mm release fl ow orifi ce.

*Garastor is manufactured under licence (Patent Number

GB2357093).

Garastor® System – Introduction

Internal view of Garastor

Garastor – polypropylene control chamber

www.intesio.co.uk

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 confi guration 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 Plus/Core or Lite

may be used in conjunction with Garastor. For further details


HOW IT WORKS

Storm or surface water fl ows through two 110mm diameter

incoming pipes. If the fl ow is light to moderate, the water is simply

stored in the chamber before being slowly released through a

30mm orifi ce. However, if the infl ow 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 suffi ciently, and the water

can fl ow out to the drainage system via the 110mm outfl ow pipe.

Inside the Garastor chamber there are specially designed weir

walls that ensure that the hydraulics of the unit work to the

optimum levels.

Garastor® System – Overview

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 fi lters•

Run-off reverts to that of a greenfi eld site•

AquaCell Plus, Core or Lite units


Garastor® System – Principal Components

Note : All components on this page are not shown to scale

4D920 Cover and Frame

S/S TwinWall Adaptor(150mm TwinWall socket x 160mm BSEN 1401 spigot for connection of

150mm TwinWall pipe directly into the AquaCell pre-formed socket)

500mm diameter

1m (6SC500)

1.25m (6SC501)

150mm TwinWall Socket

(for connection to other pipe materials, a small

section of 150mm TwinWall is required, alternatively use the

150mm Garastor Connection Kit (6SC200 – consisting of a short

section of 150mm TwinWall pipe and two

ring seals)

D/S TwinWall Adaptor(150mm TwinWall socket x 160mm

BSEN 1401 socket for connection of 150mm TwinWall pipe to 160mm BSEN

1401 pipe)

S/S TwinWall Adaptor(150mm TwinWall socket x 150mm

UltraRib spigot for connection of 150mm TwinWall pipe directly to 150mm

UltraRib socket)

D/S TwinWall Adaptor(150mm TwinWall socket x 150mm UltraRib socket for connection of 150mm TwinWall pipe to 150mm

UltraRib pipe)

6SC205Extension Kit

Coupler and sealing rings to joint a shaft of 500mm

TwinWall pipe

+

Garastor6SC500 (for use with garage undercroft)

6SC501 (for use with AquaCell Core/AquaCell Lite)

www.intesio.co.uk

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 a

level position and that the invert

of the 150mm pipe connection

is level with the base of the

concrete undercroft 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 situations with a loading

of upto 30Kn (3 tonnes) i.e.

domestic driveways.

4. 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® System – Typical Installation Methods

Garastor installation using garage void

Bitumastic paint applied to walls of void area and underside of the garage floor

Cover and frame

Wall to retain storage area

Stored water

75mm thickness of smooth finished concrete

1200g polythene damp proof membrane

50mm sandlayer

Rainwater pipe (or air brick) for ventilation

Note: The depth of foundations for standard block and beam garage floors will need to be lowered by approx. 300mm to accommodate the storage capacity required.

150mm outflow pipework to undercroft/void

110mm inflow pipework to chamber

110mm outflow pipework to drainage system

Garastor (6SC500)

Garastor installation using AquaCell*

Cover and frame AquaCell Plus, Core or Lite

Suitable impermeable geomembrane

Garastor(6SC501)

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

Note: When using Garastor

with the undercroft/void of a

garage, it is the responsibility

of the designer to ensure

that the enhancement to the

garage undercroft/void and

drainage works comply with

current prevailing Building

Regulations.

Also to prevent softening of the soils below the foundations or

loss of fines leading to settlement, the void beneath the garage

should be lined as follows:

Underneath the concrete base of the void area there should be a

1200g polythene damp proof membrane.

Bitumastic paint should be applied to the walls of the void area

and to the underside of the reinforced garage floor beams.

Intelligent stormwater solutions by Wavin

Wavin LimitedParsonage WayChippenhamWiltshire SN15 5PNTel: 01249 766600

Intesio – working to ensure

optimum stormwater management

Wavin operates a programme of continuous product development, and therefore reserves the right to modify oramend the specification of their products without notice. All information in this publication is given in good faith, andbelieved 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 andapplication intended.

www.intesio.co.uk

The combination of urban development and intensified rainfall from climate

change can create serious problems. Stormwater situations are challenges

that may be unavoidable, but they can be very effectively overcome

when the right expertise is applied.

Intesio is Wavin’s specialist focus for the most efficient capture,

transportation, cleansing, infiltration, attenuation and re-use of stormwater

at source.

The Intesio Team has the essential experience and design insight

to help engineer the best possible solution, in its widest sense,

every time.

Our well-proven system technology is intelligently applied to

the individual needs of each location and situation. We make

thorough checks to ensure efficient performance and full

adherence to the latest statutory regulations.

By making Intesio part of your project approach, the

outcome is assured: the optimum balance of cost,

function and compliance.

WM424 – May 2009/rev February 2010

CWD 3000

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