Intesio Infiltration and Attenuation Systems Product and ...

CI/SfB 

April 2011 

Infiltration and Attenuation Systems 

Product and Installation Guide 

Uniclass EPIC 

JR12:L731/L71121/L2123 J3413:X721 

(52.5) (H1) 

For residential, commercial, industrial and infrastructure applications

2 Orders: 0844 8565152 Technical Advice: 0844 8565161

Contents 

Infiltration and Attenuation 

Introduction 4-5 

Intesio - For Optimum Stormwater Management 4 

AquaCell Systems 4 

Garastor System 5 

Overview 6-8 

Overview of AquaCell Systems 6-7 

Principal Components 8 

Ancillary Components 8 

Applications 9-13 

AquaCell Eco for Domestic soakaways 

AquaCell Eco for Landscaped 

9 

and Non-trafficked Sites 10 

AquaCell Core for Trafficked installations 11 

AquaCell Plus for Deeper installations 12-13 

AquaCell System Selector 14 

Design and Installation 15-20 

Design and Installation Guidance 15-17 

Typical Soakaway Installation Method 18 

Typical Storage Tank Installation Method 19 

Silt Trap 20 

Air Vent Design 20 

Typical Connections 21-23 

Typical Connections to AquaCell Units 21 

Typical Air Vent Connections 22 

Typical Connection Configurations 23 

Typical Details 24-33 

Soakaway - Non-Traffic Loading 24 

Soakaway - Highway 25 

On-Line Storage - Box Feed 26 

On-Line Storage - Manifold Feed 27 

On-Line Storage - Central Pipe Feed 28 

On-Line Storage - Manifold Feed with Bypass 29 

Off-Line Storage - Box Feed 30 

Off-Line Storage - Manifold Feed 31 

Off-Line Storage - Central Pipe Feed 32 

Soakaway or Storage Tank - With Silt Trap 33 

Garastor System 34-37 

Introduction 34 

Overview 35 

Principal Components 36 

Typical Installation Methods 37 

Intesio stormwater management 38-39 

Other Intesio systems 38 

Intesio service 39 

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. 

Email: technical.design@wavin.co.uk www.intesio.co.uk 3

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: 

l AquaCell Eco (black unit) for domestic applications, 

and for other landscaped and non-traffi cked sites. 

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

l AquaCell Plus (light blue unit) inspectable, for use 

in deep traffi cked locations. 

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 9-13). 

With Intesio AquaCell systems, however, the required strength and 

hydraulic capabilities have been verifi ed by independent testing. 

AquaCell Eco 

AquaCell Core 

AquaCell Plus 


Infi ltration & Attenuation Systems – Introduction 

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, Garastor may be used with any 

version of AquaCell units (Eco, Core or Plus). Eco may only be 

used in landscaped situations. 

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 

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 Eco, 

Core or Plus systems, depending on the application. 

AquaCell Eco soakaway 

Large scale AquaCell Core storage tank 

AquaCell Core domestic soakaway 


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 Eco 

for domestic applications, and for other landscaped 

and non-traffi cked sites (pages 9-10) 

AquaCell Core 

for traffi cked locations (page 11), and 

AquaCell Plus 

for extra deep installations and/or inspectability (pages 12-13) 

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 geocellular systems also allow ‘brick-bonding’, 

which can give extra stability, without the need for additional 

connector pieces. See Installation Guidance page 16. 

Wrapped for infiltration 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. 

Benefiting community and environment 

AquaCell systems contribute the following benefi ts: 

l Signifi cantly reduced fl ooding risk 

l Controlled, reduced-volume release of stormwater 

into existing sewer systems or watercourses 

l Recharging of local groundwater 

(if infi ltration/soakaway application) 

l Aerobic purifi cation to improve water run-off quality 

l 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: 

1. Manifold Confi guration – this confi guration utilizes standard 

pipe and fi ttings (see page 23) 

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

units (see page 23) 

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

perferated TwinWall pipe and fi ttings (see page 23) 


Overview of AquaCell ® Systems 

Acceptance – British Board of Agrément 

The Intesio Infi ltration and Attenuation systems, AquaCell Core 

and AquaCell Plus 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 Eco 

BBA Agrément Certifi cate pending 

AquaCell Core 

Approved under BBA Agrément 

Certifi cate No.03/4018, Detail Sheet 1 

AquaCell Plus 

Approved under BBA Agrément 

Certifi cate No.03/4018, Detail Sheet 3 

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 Systems – Principal Components 

Principal Components 

AquaCell Eco Unit 

6LB025 

6UR141 

UltraRib S/S Adaptor 

(Fits into pre-formed socket to 

connect to 150mm UltraRib) 

4D916 

160mm OsmaDrain 

P/E Adaptor 

(Fits into pre-formed socket as 

an extension connection piece) 

6LB104* 

150mm Flange Adaptor 

(Adaptor to be used at points 

other than pre-formed socket 

to connect to 150mm UltraRib) 

6LB106** 

225mm Flange Adaptor 

(To connect to 225mm UltraRib) 

6TW141 

TwinWall S/S Adaptor 

(Fits into pre-formed socket to 

connect to 150mm TwinWall) 

6D129 

OsmaDrain S/S Adaptor – 

Thinwall Clay Spigot 

(For use with 6D916 when 

connecting to a BS EN 295 

Thinwall Clay Spigot) 

6SC205 

Extension Kit 

AquaCell Core Unit 

6LB100 

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

Ancillary Components 

*6LB104 – Can only be used when 

constructing an air vent, on the top 

surface of the unit, when installed with 

AquaCell Eco (6LB025). 

**6LB106 – Not suitable for use with 

AquaCell Eco (6LB025). 

6D099 

OsmaDrain S/S Reducer 

160mm x 110mm (fits into 

pre-formed socket to connect 

to 110mm OsmaDrain) 

6LB300 

Domestic Silt Trap 

(Bucket and extension piece available) 

AquaCell Plus Unit 

6LB200 

6LB105 

Clip 

(Used to hold units 

together horizontally) 

6LB102 

Shear Connector 

(Used to hold units 

together vertically) 

6LB600 

Silt Trap 

(Use extension kit if required) 

All ancillary components can be used with any AquaCell unit, 

except the 225mm Flange Adaptor (6LB106) which must only 

be used with AquaCell Core or AquaCell Plus. 

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

when constructing an air vent on the top surface of an 

AquaCell Eco unit. The adaptor should not be used to connect 

inlet pipes to the side of the AquaCell Eco unit. 

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


AquaCell Eco for Domestic Soakaways 

AquaCell Eco has been designed for limited-depth 

installations in non-traffi cked areas of domestic 

gardens and similar landscaped sites. 

AquaCell Eco is suitable for installations to a maximum 

depth of 1.5 metres. 

See overleaf, page 10, for other landscaped 

and non-traffi cked applications. 

In addition to features and benefi ts applicable to ALL 

AquaCell systems, those specifi cally applicable to 

AquaCell Eco (black unit) include: 

l Manufactured from recycled plastic 

l Suitable for soakaways or attenuation applications 

l Proven vertical loading capacity: 17.5 tonnes/m 2 

l Proven lateral loading capacity: 4 tonnes/m 2 

l For installation depth (to base of units) of up 

1.5 metres maximum 

l Integral ‘hand holds’ for easy carrying/handling 

l BLACK colour – easy to distinguish from other 

AquaCell systems 

l Specifi cally designed for shallow depth, low-loaded, 

landscaped sites 

l Ideal for smaller projects 

NOTE: AquaCell Eco is NOT suitable for locations subject 

to a high water table. 

AquaCell Eco 

6LB025 

Typical application 

Domestic back gardens 


AquaCell Eco for other Landscaped/Non-traffi cked Sites 

AquaCell Eco is also designed for other landscaped 

and traffi c-free applications where heavy loading 

capability is not required. 

AquaCell Eco is suitable for installations to a maximum depth 

of 1.5 metres. Minimum cover depth is 0.3m, but recommended 

cover depth is 0.5m. 

Any installation using AquaCell Eco must NOT be subjected to 

additional loading at any time. Traffi cking by construction plant on 

site, including mechanical backfi lling equipment, must be avoided. 

If traffi cking of the buried tank by construction plant or other 

vehicles is unavoidable, the installation should use AquaCell Core 

units (see page 11). 

The width of an AquaCell Eco installation should not exceed 

12 metres to allow for mechanical backfi lling without loading. 

There is no limit to installation length. 

See previous page 9, for small domestic soakaway applications 

and for AquaCell Eco (black unit) specifi c features and benefi ts. 

NOTE: AquaCell Eco is NOT suitable for locations subject 

to a high water table. 

AquaCell Eco 

6LB025 

Typical applications 

Grassed and leisure areas 

Roundabouts 


AquaCell Core for Traffi cked Sites 

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: 

l Large scale 7,000 unit soakaway under airport car park 

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

station site 

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

In locations where traffi c loading is NOT anticipated, AquaCell Eco 

(black unit) should be selected (see pages 9-10). 

Features and benefi ts specifi cally applicable to traffi ckable 

AquaCell Core (blue unit) include: 

l BBA approved and can meet technical requirements of NHBC 

l Proven vertical loading capacity: 56 tonnes/m 2 

l Proven lateral loading capacity: 7.75 tonnes/m 2 

l For installation depth of up to 4.1 metres to base of units 

(4.25 metres if non-traffi cked) 

l Distinctive BLUE colour – easy to identify 

l 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 

6LB100 

Typical applications 

Industrial/commercial areas 

Email: technical.design@wavin.co.uk www.intesio.co.uk 11 

Roads

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 Eco if there is at least 

one layer of AquaCell Core in between the Plus and Eco 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 

l Vertical: 65 tonnes/m 2 

l Lateral: 8.55 tonnes/m 2 

Installation depth 

l Maximum to base of units*: 5.08 metres 

*in best soil conditions 

Other features 

Specifi c to AquaCell Plus: 

l Distinctive LIGHT BLUE colour – for ease of inspectability 

l Integral inspection tunnel 

l 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 Eco* and/or AquaCell Core. 

*NOTE: AquaCell Eco can only be used in conjunction with 

AquaCell Plus if there is at least one layer of AquaCell Core in 

between the Plus and Eco layer. 

Extra deep installations 

Non-trafficked areas 

Trafficked areas 

AquaCell Plus 

6LB200 

End cap for when an 

inspection channel 

is not required 


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-to-end, 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. 

Inspectability scenarios 

AquaCell Core and AquaCell Plus 

Trafficked tank installation with inspection channels 

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. 


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. 

Will the site be subject to traffic loading? 

NO YES 

Does the site have a high water table? 

NO YES 

Will both tank length and width be 

more than 12m? 

NO YES 

Will the tank be more than 1.5m deep? 

NO YES 

Use: 

Eco to 1.5m deep 

Eco AquaCell Eco (6LB025) 

Will the tank be more than 4.25m deep? 

Will the tank need to be installed 

extra deep (ie deeper than 4.1m 

in ideal soil conditions)? 

NO YES NO YES 

Use: 

Core to 4.25m deep 

OR a combination of: 

Eco to 1.5m deep and 


See pages 9-10 

Core AquaCell Core (6LB100) See page 11 

Plus AquaCell Plus (6LB200) 

Notes: 

See pages 12-13 

AquaCell Eco cannot be used directly 

with AquaCell Plus. 

If the tanks need to be inspectable, contact 

Wavin Technical Design on 0844 8565161. 

Use a combination of: 

Eco to 1.5m deep with* 

Core to 4.25m deep and 

Plus to 5.08m deep 

*NOTE: AquaCell Eco units cannot be directly connected to AquaCell Plus 

Use: 


Use a combination of: 

Core to 4.1m deep and 

Plus to 4.78m deep 


Design and Installation Guidance 

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 Eco, 

Core and Plus. 

Structural design, however, 

requires careful consideration 

of loading factors specific to 

each location. 

Installation and 

Cover Depths 

After deciding which AquaCell 

system is correct for the project 

location (using the System 

Selector on page 14), 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. 

0.3-0.5m 

minimum 

cover depth 

Max. depth 

to 1.5m 

Max. depth 

to 4.25m 

Max. depth 

to 5.08m 

Minimum cover depth 

AquaCell AquaCell AquaCell 

Location type Eco Core Plus 

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

Car parks, vehicle up to 2500 kg a 

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 4.25m c 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 Eco, 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. 

AquaCell Systems: 

Installation Depths 

Each AquaCell system has 

been designed to have specific 

loading capacities (see pages 

9-13) 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 

Eco Core Plus 

Mixing AquaCell units together 

l Deep-running drainage 

network 

l Other buried services running 

above tank location 

l Installation into banked/ 

sloping ground 

l Upper layer of clay 

preventing infiltration 

0.6-0.75m 

minimum 

cover depth 

Max. depth 

to 4.1m 

Max. depth 

to 4.78m 



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: 

1 Depth of cover (See page 14) 

2 Soil type 

3 Surface finishing 

4 Presence of groundwater 

5 Type of traffic/loading 

Non-trafficked Trafficked 

3 

2 

4 

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. 

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/m 2 

These factors have already been taken into consideration 

within the System Selector on page 14 for the three AquaCell 

systems, and in the cover depth and installation depth guidance 

on page 15. 

5 

1 1 

Suitable box 

system = ? 

Suitable box 

system = ? 

3 

2 

4 

‘Brick-bonding’ unit assembly 

Recommended for extra stability 

When assembling a geocellular structure that comprises two or 

more layers, it is recommended that AquaCell units are placed 

in a ‘brick-bonded’ configuration. 

This helps minimise 

continuous vertical joints 

in the assembly, and gives 

the structure extra stability. 

No extra connectors required with AquaCell 

A significant advantage of AquaCell unit design is that 

brick-bonding placement does not require extra connectors. 

All three AquaCell systems may be placed in this way, unless 

inspection channels and cleaning access are required using 

AquaCell Plus (see NOTE). 

NOTE: AquaCell Plus units incorporate integral inspection 

channels. These are designed for combined alignment to create 

viewing tunnels at the base of an assembled structure. 



Soakaway or tank? 

Checking site suitability 

Infi ltration criteria 

A site is suitable for infiltration (soakaway) provided that BOTH 

of the following are confirmed: 

l The underlying soil surrounding the proposed installation 

is sufficiently permeable 

l The seasonally high water table is a minimum of 1 metre 

below the base of the proposed installation 

If either of these criteria is not the case, or cannot be confirmed 

for any reason, a soakaway system may not be suitable for the 

application. 

Storage tank 

If infiltration is not possible, the system may be wrapped in an 

impermeable geomembrane to create a storage tank which would 

discharge at a fixed flow rate via a flow restriction device to a 

permissible outflow point. 

This may be designed to be online or offline (see pages 26-32 

for typical details). 

However, if the site is subject to groundwater or a high water 

table, it is important to ensure that the tank is not vulnerable to 

flotation. Sufficient weight from soil, or other covering placed over 

the AquaCell units, must be sufficient to counter any buoyancy 

uplift force of that water. 

Site assessment 

Ground conditions may be established as part of a geotechnical 

assessment. This may include tests for infiltration and ground 

water level. 

If there is no confirmation that such assessments have been 

conducted, or resulting conclusions are unavailable, a trial pit 

will be required in accordance with BRE 365. 

For information and guidance, please contact the Intesio 

Technical Support Team. 

AquaCell Eco: 

Additional Installation Guidance 

As AquaCell Eco is designed for landscaped and non-loaded 

applications, 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 traffi c on site 

If construction plant (e.g. excavators or loaders) are likely to run 

over the installation: 

l MINIMUM protective cover should be 500mm well-compacted 

granular material 

l Only tracked excavators can be used and MUST NOT weigh 

more than 14 tonnes. Compaction plant must not exceed 

2300kg per metre width 

l HGVs MUST NOT run over installed AquaCell Eco units 

Backfi lling 

When backfilling AquaCell Eco installations: 

l Machines placing the material must be located OFF the units 

l Only light compaction should be applied to the material 

If Type 1 sub-base (or similar) material over AquaCell Eco units 

requires compaction: 

l First layer should be 300mm thick before any compaction 

l NO vibratory mechanism should be used for compacting 

this first layer 

l MAXIMUM roller size: 2300 kg per metre width 

Ancillaries and Adaptors 

All ancillaries and adaptors (see page 8) can be used with 

either the AquaCell Eco, Core or Plus units, except the 

225mm Flange Adaptor (6LB106) which must only be used 

with AquaCell Core or Plus. 

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

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

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

side of an Eco unit. 


Typical Soakaway Installation Method 

AquaCell Units 

Coarse sand or non angular granular material base and surround 

Example shows the use of 

AquaCell Eco. However, a 

soakaway can also be installed 

as shown using either of the 

other versions of Aquacell units 

(Core or Plus) 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. 

Typical Installation Procedure 

100mm 

100mm 

Permeable geotextile* 

Pre-formed socket 

100mm 

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) – see page 16. 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 Domestic Silt Trap (6LB300) or the standard Silt Trap 

(6LB600) is installed prior to the inlet pipework – see page 20 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. 


Typical Storage Tank Installation Method 


Coarse 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 any 

of the other versions of 

AquaCell units (Eco or Plus) 

as appropriate. 

* 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 

contact Wavin Technical Design. 

Typical Installation Procedure 

100mm 

100mm 

Suitable impermeable 

geomembrane 

Suitable protective 

geotextile layer 

Pre-formed socket 

100mm 

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) – see page 16. 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 appropriate 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 Domestic Silt Trap (6LB300) or the standard Silt Trap 

(6LB600) is installed prior to the inlet pipework – see page 20 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 

Silt Trap 

150mm side 

fill of suitable 

‘as dug’ material 

or granular 

material 

250mm Dia Silt Trap 

110mm Dia 

OsmaDrain Pipe 

100mm bed of 

suitable ‘as dug’ 

material or granular 

material 

Typical Air Vent Design 

Balloon Grafting 

Flange 

Connector 

(6LB104) 

Cover and Frame (4D961) 


Ventilation Box 

110mm OsmaDrain Pipe 

Geomembrane sealed to 

Flange 

Typical Installation 

Procedure 

1. Place the Domestic Silt Trap (6LB300) 

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. 

NOTE: When surrounded by a concrete plinth 

(150mm x 150mm) the 4D961 Cover and Frame 

can be used in situations with a loading of up to 

10kN (1 tonne). 

150mm x 110mm Reducer 

(6UR099) 

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. 


Typical Connections to AquaCell Units 

NOTE: It is recommended that all connections and air 

vent installations in storage applications (using 

geomembrane) are made using a Flange Adaptor. 

Adhesive or double sided tape should be used 

between the geomembrane and the fl ange plate to 

ensure a watertight seal. 

Connection for soakaway application using either 

the pre-formed socket (as shown below) or standard 

adaptors into pre-formed socket* 


Permeable 

Geotextile Wrap 

Coarse Sand or Non-Angular Granular 

Material Base and Surround 

Connection for storage application using Flange 

Adaptor at points other than pre-formed socket, 

(for AquaCell Plus/Core only). 

AquaCell Plus/ 

Core Only 

Geomembrane Wrap 

Coarse Sand or Non-Angular Granular 

Material Base and Surround 

Jubilee clip 

150mm 

pipework to suit 

Flange Adaptor 

(6LB104/6LB16) 

150mm 

pipework to suit 

*NOTE: For pipework other than 160mm 

OsmaDrain, these adaptors can be used to 

connect to the following: 

l 6TW141: TwinWall S/S Adaptor connects 

to 150mm TwinWall 

l 6D099: OsmaDrain Adaptor connects 

to 110mm OsmaDrain 

l 4D916: OsmaDrain PE Adaptor connects 

to 160mm OsmaDrain 

l 6UR141: UltraRib S/S Adaptor connects 

to 150mm UltraRib 

l 6D128: OsmaDrain S/S Adaptor connects 

to 150mm thinwall clay. (needs to be used 

in association with 4D916 Adaptor) 

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. 

*NOTE: AquaCell Eco is not suitable for side 

connection using a Flange Adaptor. 


Typical Air Vent Connections 

Top Connection for Air Vent 

Connect into the top of the AquaCell unit, 

using Flange Adaptor. 

Connect suitable pipework to form air vent 

Flange Adaptor (6LB104) 

Geomembrane wrap 


Coarse sand or non angular 

granular material base and 

surround 

Side Connection for Air Vent 

Connect into the side of the AquaCell tank unit using 

standard OsmaDrain Reducer (6D099). 

Geomembrane wrap 


Coarse sand or non angular 


surround 

Jubilee clip 

OsmaDrain S/S reducer (6D099) 


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. 

Suitable bend and 

pipework to form air vent 


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. 


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 fi ttings 

150mm/225mm UltraRib 

Pipe 

Precast concrete chamber 

sections and cover slab 

150mm concrete surround 

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

See pages 27, 29 and 31 for this option in context. 

Box Connection 

Using AquaCell Core units 

for fast water transfer 

Pipe 




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

Central Pipe Connection 

Using standard perforated 

TwinWall pipe and fi ttings 

Pipe 



Cover and frame 

Sump 

Sump 


14mm - 20mm single 

size granular bedding / 

backfill material 

150mm concrete surround Perforated 

TwinWall pipe 

NOTE: See pages 28 and 32 for this option in context. 


Sump 

AquaCell box 

unit assembly 

AquaCell box unit assembly 




Typical Details: Soakaway – Non-Traffic Loading 

Deep Soakaway 

Non-traffi c load area 

110mm 

OsmaDrain 


Domestic 

Silt Trap 

Trench Soakaway 

Non-traffi c load area 

S 

T 

Min depth* 


Min depth* 

Ground level 

T 

S 

Installation 

depth* 

Key 

Ground level 

S = AquaCell units soakaway 

(See note 2) 

T = 250mm Dia Silt Trap 

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 15. 

Installation 

depth* 


Typical Details: Soakaway – Highway 

For minimum depth of 

cover contact Wavin 

AquaCell Plus and AquaCell Core only 

Footpath Finished road level 

225mm UltraRib 

150mm UltraRib 

Silt trap 

To road gully 

150mm 

Concrete surround 


Typical Details: On-Line Storage – Box Feed 

Water 

flow 

Water 

flow 


Precast 

concrete 

chamber 

sections and 

cover slab 

Long Section 

Typical vent detail 

Open grating 

Ventilation box 


A 


Precast 

concrete 

chamber 


cover slab 

Flow control 

Sump Sump 

A 

Upstream control chamber 

Plan 

Cross Section A-A 

Sump 

Geomembrane wrap with outer 

protective geotextile wrap AquaCell Core units 

AquaCell unit assembly Coarse sand or non angular 


surround 

AquaCell Plus units 

used as the lower 

layer 

AquaCell unit assembly 


Downstream control chamber 

Cover and frame Flow control 

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. 

Water 

flow 

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

26 Orders: 0844 8565152 Technical Advice: 0844 8565161 

Water 

flow

Typical Details: On-Line Storage – Manifold Feed 

Water 

flow 

Water 

flow 


Precast 

concrete 

chamber 


cover slab 

Long Section 


Open grating 



A 


Precast 

concrete 

chamber 


cover slab 

Flow control 

Sump Sump 

A 

Upstream control chamber 

Plan 

Sump 

3-pipe manifold 



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. 


AquaCell unit assembly Coarse sand or non angular 


surround 




Downstream control chamber 

Cover and frame Flow control 

Water 

flow 


protective geotextile wrap AquaCell Core units 

AquaCell Plus units used 

as inspection access 

Email: technical.design@wavin.co.uk www.intesio.co.uk 27 

Water 

flow

Typical Details: On-Line Storage – Central Pipe Feed 

Water 

flow 

Water 

flow 


Precast 

concrete 

chamber 


cover slab 

Long Section 

Coarse sand or non angular granular 

material base and surround 



Open grating 




Wavin TwinWall half-perforated pipe 

14mm - 20mm single size granular 

bedding/backfill material 


Geomembrane to perimeter of constructon 

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

percolation through the granular bedding material. 

Wrap the entire 

AquaCell unit 

assemblies 

with a geotextile 

wrapping as 

appropriate 

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. 


A 


Precast 

concrete 

chamber 


cover slab 

Flow control 

A 

Sump Sump 



Upstream control chamber Downstream control chamber 

Plan 

Sump 


Water flow during storm event Water flow after storm event 


Flow control 

28 Orders: 0844 8565152 Technical Advice: 0844 8565161 

Water 

flow 

Water 

flow

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

Water 

flow 

Water 

flow 


Precast 

concrete 

chamber 


cover slab 

Long Section 

Plan 

Upstream control 

chamber 




Bypass pipe 

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. 


Open grating 


150mm concrete 

surround 


Precast 

concrete 

chamber 


cover slab 

Flow control 

Sump 

A 

Sump 


Sump 

Manifold pipe arrangement 

Bypass pipe 

AquaCell unit 

assembly 

A 


protective geotextile wrap 




Geomembrane wrap with outer protective geotextile wrap 

Downstream control 

chamber 

Flow control 

Water 

flow 

Water 

flow 


protective geotextile wrap Bypass pipe 


Typical Details: Off-Line Storage – Box Feed 



Long Section 


Plan 






Open grating 





A 

A 


Precast 

concrete 

chamber 


cover slab 

Weir 

wall 

Precast concrete 

chamber sections 

Flow 

control 

Sump 

Non-return flap valve 


Weir 

wall 

Water 

flow 


Flow control 

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. 

Water 

flow 

Water 

flow 


surround 


box unit storage assembly, finding its own level, and 

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

weir wall. 



Typical Details: Off-Line Storage – Manifold Feed 



Long Section 


Plan 



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. 



Open grating 





A 

A 



Precast 

concrete 

chamber 


cover slab 

Weir 

wall 

Precast concrete 

chamber sections 



Flow 

control 

Sump 



Weir 

wall 

Water 

flow 

Flow control 

Water 

flow 

Water 

flow 


surround 


Typical Details: Off-Line Storage – Central Pipe Feed 



Long Section 

A 

A 



Open grating 



Wavin TwinWall half-perforated pipe 

Wavin TwinWall half-perforated pipe 14mm - 20mm single size granular 

bedding/backfill material 

Plan 

Water flow during storm event Water flow after storm event 

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



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


Precast 

concrete 

chamber 


cover slab 

Weir 

wall 

Flow 

control 

Sump 


Water 

flow 

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 

Flow control 

Water 

flow 

Geomembrane to perimeter of constructon 

Water 

flow 

Wrap the entire 

AquaCell unit 

assemblies 

with a geotextile 

wrapping as 

appropriate 


Typical Details: Soakaway or Storage Tank – With Silt Trap 

Notes 

AquaCell Eco 

AquaCell Core 

AquaCell Plus 

For minimum depth of 

cover contact Wavin 

(Choice depends on application and site conditions) 

Ground level 

For bedding specification information refer to page 18 or 19. 

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

shown) or a storage tank. 

110mm 

OsmaDrain 

110mm 

OsmaDrain 

Domestic 

Silt Trap 

110mm 

OsmaDrain 


Garastor ® System – Introduction 

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 – polypropylene control chamber 

Internal view of Garastor 


Garastor ® System – Overview 

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, Garastor may be used with any 

version of AquaCell units (Eco, Core or Plus). For further details, 

contact Wavin Technical Design. 

NOTE: Eco may only be used in non-loaded situations. 

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. 

Key benefi ts 

l No use of valuable, developable land 

l Safer than open/above ground storage structures 

l Caters for 1 in 150 year storm 

l Spreads cost of water storage over the development period 

l Maintenance free, with no moving parts or fi lters 

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

AquaCell Eco, Core or 

Plus units 


Garastor ® System – Principal Components 

1m (6SC500) 

1.25m (6SC501) 

500mm diameter 

Garastor 

6SC500 (for use with garage undercroft) 

6SC501 (for use with AquaCell systems) 

+ 

6SC205 

Extension Kit 

Coupler and sealing rings 

to joint a shaft of 500mm 

TwinWall pipe 

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) 

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 


BSEN 1401 socket for connection of 

150mm TwinWall pipe to 160mm BSEN 

1401 pipe) 

D/S TwinWall Adaptor 


UltraRib socket for connection of 

150mm TwinWall pipe to 150mm 

UltraRib pipe) 

4D920 

Cover and Frame 

S/S TwinWall Adaptor 


BSEN 1401 spigot for connection of 

150mm TwinWall pipe directly into the 

AquaCell pre-formed socket) 

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


Garastor ® System – Typical Installation Methods 

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 

4D920, 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 installation using garage void 

Bitumastic paint 

applied to walls 

of void area and 

underside of the 

garage floor 


110mm outflow 

pipework to 

drainage system 

Wall to retain 

storage area 

Garastor (6SC500) 

150mm outflow 

pipework to 

undercroft/void 

110mm 

inflow 

pipework 

to chamber 

Garastor installation using AquaCell* 

Stored water 

50mm 

sand 

layer 

Cover and frame AquaCell Eco, Core or Plus units 

Garastor 

(6SC501) 

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. 

Rainwater 

pipe (or air 

brick) for 

ventilation 

1200g polythene 

damp proof 

membrane 

75mm thickness 

of smooth finished 

concrete 

Suitable impermeable 

geomembrane 

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. 

NOTE: Depending on the 

application, Garastor may be used 

with any version of AquaCell units 

(Eco, Core or Plus). Eco may only 

be used in low-loaded situations. 

For further details, contact Wavin 

Technical Design. 

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. 


Intesio: balancing cost, function and compliance 

To achieve optimum 

stormwater management 

Intesio represents a combination of specialist expertise and 

technology from Wavin. This is specifi cally focused on achieving 

the optimum solution for each project requiring effective and 

sustainable management of stormwater. 

Such a solution may be entirely based on a tailored combination 

of our engineered systems. 

In other cases, Intesio technology can be integrated with ‘soft’ 

SUDS techniques, such as ponds and swales, to help achieve 

required water management criteria for site concerned. 

Other Intesio systems 

Channel drainage 

Environmentally-friendly polyester concrete systems 

to cover all EN 1433 load classes. With outstanding 

chemical resistance and low water absorption: 

l PolyChannel SK range: general purpose channel 

for applications up to E600 

l PolyChannel SKS range: heavy duty channel 

for applications up to F900 

Also from Wavin: AquaGrid pervious paving. 

Flow control valves 

The Vortex valve range that can be custom-built to suit 

site conditions: 

l Fluidic-Amp and Fluidic Cone stainless steel units with no 

moving parts or power needs 

Also from Wavin: Anti-Flood Valves that comply with EN 13546-1, 

and Part H1- Sections 2.8-2.12 of Building Regulations. 

Oil separators 

A range of chambers, tested to BS EN 858-1 

Class 1, and included on the Environment Agency 

recommended list. To fulfi l PPG3 requirements for 

cleansing of surface run-off. 

Below ground water transportation 

Intesio installations can draw from an extensive choice 

of plastic and clay water conveyance systems from 

Wavin, including: 

l OsmaDrain solid wall PVC-U pipe system 

l Structured wall plastic UltraRib and TwinWall pipe systems 

l SuperSleve and HepSeal clay pipe systems 

Other options include perforated pipe for land drainage: 

WavinCoil plastic and HepLine clay – and a full range of 

non-entry inspection chambers. 

Rainwater re-use 

Intesio sustainable schemes can also exploit stored 

rainwater. These reduce use of potable mains water for 

non-potable purposes. 

Below ground domestic rainwater re-use systems are available. 


Intesio service 

Precision and performance 

The Intesio Team is ready to contribute to any stormwater 

management project. 

This may be at the very earliest stage – or when initial plans have 

already been developed. There are no pre-conditions for your 

asking us to become involved. 

We are ready to: 

l Originate project design 

l Comment on an existing design 

l Help validate a specifi cation – or, where we see an opportunity 

to do so, to suggest how it may be enhanced 

l Check, clarify and confi rm maximum cost-effi ciency, 

performance capability and regulatory compliance 

This involvement is a core part of the Intesio principle. It extends 

beyond the systems and components. 

Intesio is a total, specialist approach and service. It is designed for 

working partnership with professional specifi ers and contractors 

to achieve the most sustainable outcome for each project. 

To discuss your stormwater management project, call 

01249 766 655 

or email 

info@intesio.co.uk 


Intesio – working to ensure 

optimum stormwater management 

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. 

Wavin Limited 

Hazlehead 

Crow Edge 

Sheffield 

S36 4HG 

www.intesio.co.uk 

Wavin operates a programme of continuous product development, and therefore reserves the right to modify or 

amend the specification of their products without notice. All information in this publication is given in good faith, and 

believed to be correct at the time of going to press. However, no responsibility can be accepted for any errors, 

omissions or incorrect assumptions. Users should satisfy themselves that products are suitable for the purpose and 

application intended. 

WM424 – April 2011

Intesio Infiltration and Attenuation Systems Product and ... - i4info.biz

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