drainage systems (sustainable drainage system)

Sustainable drainage systems

marley.co.uk

sustainable drainage systems

32

P.4 T h e e n v i r o n m e n t

P.6 Ke y c o m p o n e n t s

P.10 R e g u l a t i o n s a n d g u i d a n c e

P.12 App l i ca t ions

P.14 H y d r a u l i c des ign

P.16 Des ign

P.18 S t ructura l des ign

P.20 Ins ta l la t ion data

P.24 Typ ica l deta i l s

P.28 Maintenance

P.28 Appendices

P.30 P roduct in format ion

Contents

The Waterloc250 modular geocellular unit is the result of extensive research and testing in the UK and across Europe. This improved product forms part of the range of Marley sustainable drainage systems, which also includes the Flowloc vortex controller.


54

marley.co.uk Technical hotline: 01622 852695

The environment

Marley Plumbing & Drainage is a leading supplier of products for the building and construction industry.

Marley Plumbing & Drainage is part of the Aliaxis group of companies, internationally recognised as a major global supplier of construction products.

The Company is actively committed to adopting good sustainable practices. In developing its business, products and services, Marley Plumbing & Drainage will:

Environmental policy

n Comply with all relevant environmental legislation, codes of practice and standards relating to quality and the environment.

n Conform to the environmental policy of the Aliaxis Group of companies.

n Continually improve the Company’s environmental performance, minimising any pollution risk and adopting best industry practice.

n Regularly review performance and set clear objectives and targets to ensure environmental impacts are managed and reduced.

n Increase the use of recycled materials where appropriate.

n Take positive action to reduce waste by promoting energy conservation and recycling.

n Ensure that employees of Marley Plumbing & Drainage have the necessary knowledge, resources and skills to implement the environmental policy of the Company.

n Communicate the Environment Policy of Marley Plumbing & Drainage to customers and other stakeholders to share in the Company’s aim of excellence in environmental management.

n Consider the needs and expectations of all customers and other stakeholders.

Brian Blanchard, Managing Director December 2009

The Company operates a quality management system which meets the requirements of BS EN ISO 9001:2008.

dhm plastics ltd are certified to BS EN ISO 14001:2004, the worldwide recognised environmental standard.

dhm plastics ltd manufactures products for Durapipe, Hunter Plastics and Marley Plumbing & Drainage at the Company’s head office in Kent, South East England.

T h e e n v i r o n m e n t

‧ Geocellular units are exceptionally

easy to handle on site, allowing

rapid construction of the tank

‧ The modular format allows flexibility

in the design of the tank plan area

or depth to suit available space and

ground water levels.

It is now widely recognised that the effects of climate change and the increase in the built environment have necessitated changes to the way in which stormwater is dealt with.

Sustainable drainage systems

(SUDS) provide an effective way of

mimicking natural drainage before

development takes place; whether to

counteract the effect of overloading

gravity pipelines and watercourses,

which can contribute to flooding

downstream; or conversely, dealing

with rainwater run off on site to

replenish ground water levels,

particularly in times of water

shortage. SUDS are now at the

forefront of environmental policy

and planning.

The advantages of below ground SUDS solutions:

‧ Low space utilisation

‧ No health and safety risk

‧ Adaptability to suit site conditions

‧ Low vandalism risk

‧ Low maintenance

‧ A square or rectangular tank

configuration minimises the

amount of excavated spoil and

simplifies the backfilling process

‧ A porosity ratio of 96% minimises

the extent of the excavation for any

given tank volume

Compared with the more traditional methods of creating underground stormwater

storage, such as concrete rings or large diameter pipe sections, modular cells offer

some distinct advantages.


76


Key components

Ke y c o m p o n e n t s

WLRC250 top layer cell connector

WLRB250 Waterloc250 cells

WLRCI250 Cell clip

WLRP250 base plate

WLRE250 110mm/160mm inlet/outlet connector (outlet configuration)

WLRE250 110mm/160mm inlet/outlet connector (inlet configuration)

WLRE250L & WLRE250M Quantum 225mm/300mm inlet connector

Cell assembly indicators

Layer 2

Layer 1

Cell lifting bars

The Marley Waterloc250 cell is ideal for use in either an underground infiltration or attenuation system. 96% of the cell volume is available to store water, minimising the extent of excavation required for the installation. In addition, the innovative design of Waterloc250 enables the cells to be quickly built into layers and configured to suit the area available.

Waterloc250 key characteristics

Waterloc250 has lifting bars and an arrow moulded into the top face. The cells are

assembled by rotating them by 180° from the nested stack. The cell clip must be used

around the perimeter of the base layer of the installation. The cell clip can also be

used between cells on the base layer, to aid the rigidity of the installation. Optionally,

these clips can be used between cells to link the structure at different levels.

Pipe connections can be made to allow inlet and outlet connections at any position

around the periphery of the tank. A special feature of the spigot connector is a screw

fixed mounting plate that enables the geotextile or geomembrane liner to be easily sealed

around the connection prior to fitting the pipe. The Marley Inlet chamber also provides

a water entry method and / or access for inspection.

Waterloc250 benefits

‧ Unique nesting ability of cells

reduces storage on site and

transportation costs

‧ Layers are quickly assembled by

rotating alternate cells 180°

‧ Size (1200mm x 800mm x 290mm

high) and modular nature allows for

maximum flexibility where space

is restricted

‧ Exceptional vertical and lateral

loading capability

‧ Open cell structure allows rapid

dispersion of water

‧ Range of options making pipe

connections quick and easy

‧ Four Waterloc250 cells = 1m3

making volume calculation

straightforward

‧ BBA S1/44154 certification

Property Vertical loading Lateral loading on top face on side face

Short term characteristic compressive strength 350kN/m2 82kN/m2

Short term load to cause 1mm deflection 47kN/m2 7.1kN/m2

Waterloc250 key performance criteria

Help us to reduce our carbon footprint! Waterloc250 cells, uniquely can be nested for storage and transportation – saving space and the number of lorries needed to deliver to site.

Colour Black

Unit dimensions Length: 1200mm. Width: 800mm. Height 290mm*

Weight 12kg

Void ratio 96%

Storage volume 250 litres

Storage capacity 240 litres

Material Polypropylene

Waterloc250 specification overview

* Effective depth when installed in multiple layers: 260mm


98


Key components

Ke y c o m p o n e n t s

flowloc

250mm silt trap, UG60 600mm silt trap, USW30 (shown with riser kit)

Inlet chamber, UMF21. Adaptor tray, UMF22A

Flowloc is a Vortex flow control unit, which is used as part of an attenuation scheme.

‧ Heavy duty aluminium flow

controller and coupling system,

electro coated for long service life.

Available to suit a wide range of

flow rates. (Refer to performance

tables in appendix two on page 29)

‧ Supplied within a chamber

base with an integrated filter

providing protection against

controller blockage

‧ Suitable for use with tank depths

up to 4m

‧ All components readily removable

from surface for ease of maintenance

‧ The chamber base is also suitable

for installation within a conventional

man entry inspection chamber

if required

Flowloc controls the rate at which water is discharged to a surface water drain or

watercourse. Local Authorities or Water Companies normally set an outflow rate for

new developments.

The design of Flowloc is based on the proven vortex principle, and enables a near

constant discharge rate to be achieved, independent of the head of water in the

tank. Available to accommodate flow rates ranging from 2 l/s to 15 l/s, Flowloc is

installed in a chamber base with a withdrawal handle to allow easy access from the

surface for maintenance. In the unlikely event of blockage, an overflow pipe allows

water to bypass the controller to the outlet.

An extensive range of orifice plate flow control units are also available for

applications where very low flow rates are required or for higher flows where

there is a less stringent requirement for controlling the water flow rate.

Inlet/inspection chamber

The Marley inlet chamber provides

access to the soakaway or attenuation

scheme for inspection and cleaning. A

column of cells is omitted beneath the

chamber to provide an inspection well.

The chamber is seated into an adaptor

tray (ordered separately). It can also

be used as an inlet connection or

connection for an air vent. For larger

installations, multiple inlet chambers

can be used, but must be bounded on

all sides by cells.

Silt traps

Available in 250mm and 600mm,

with or without additional filters. It

is recommended that all stormwater

drainage systems that discharge into

infiltration or attenuation tanks have

upstream filtration to minimise the

build up of silt and prevent the ingress

of debris. The UG60, 250mm silt trap

is suitable for catchment areas up to

250m2. For larger catchment areas, the

600mm silt trap, USW30 should be used.


1110

Regulations and guidance

R e g u l a t i o n s a n d g u i d a n c e


Over recent years a number of studies, recommendations and guidance documents have been published, all of which consider how sustainable drainage should be encouraged and implemented. Added to this, regulatory guidance is also evolving.

Planning Policy Statement 25 (PPS25)

December 2006. Department ofCommunities and Local Government

Development and flood risk

Published in December 2006, PPS25

sets out the Government’s policy on

different aspects of land use planning

in England. With respect to SUDS, the

policy document states that “Regional

planning bodies and local authorities

should promote the use of SUDS for

the management of run-off. Local

planning authorities should ensure

that their policies and decisions on

applications support and complement

Building Regulations.”

Specific advice for Scotland

In Scotland, as part of the enabling legislation relating to the Water Framework

Directive, the term ‘Sewer’ was redefined to include SUDS. Through this, Scottish

Water was made responsible for the future maintenance and capital replacement

of shared public SUDS schemes. These changes were brought in through the

enactment of stage 3 of the Water Environment and Water Services (Scotland)

Act 2003. Scottish Water will now vest (adopt) detention ponds, basins and

underground storage structures designed to attenuate surface water runoff.

Sewers for Scotland 2nd Edition, 2007 now provides guidance on the design,

operation, maintenance etc of sustainable drainage systems. The Scottish Building

Standards, section 3: Surface water drainage also contains specific advice.

The Pitt Review

Learning lessons from the 2007floods. Sir Michael Pitt.

This report contains over 90

recommendations for better flood

risk planning in England and Wales.

In December 2008, the Government

provided a response to the report.

A number of the recommendations

concern the use and adoption

of SUDS; “Local Surface water

management plans (SWMPs) as set out

under PPS25 and coordinated by local

authorities should provide the basis

for managing all local flood risk.” The

Government response was to support

this recommendation and state the

intention that Local Authorities will

be responsible for adopting and

maintaining sustainable drainage

systems (SUDS) in the public realm.

CIRIA publications

The SUDS Manual 2007.CIRIA C697

This guidance provides best

practice advice on the planning,

design, construction, operation and

maintenance of Sustainable Drainage

Systems (SUDS) to facilitate their

effective implementation within

developments.

Sustainable drainage systems –Hydraulic, structural and waterquality advice 2004. CIRIA C609

A report which details the

appropriate approach to the

successful design and construction

of Sustainable Drainage Systems.

Structural design of modular geocellular drainage tanks 2008. CIRIA C680

Co-sponsored by Marley, this report

focuses specifically on the different

types of underground geocelluar

modular units. It provides guidance on

test methods, structural design and the

practical issues that should be considered

in the design phase of a project.

Building Regulations

Department of Communities and Local Government

Approved Document H3:

Rainwater drainage, 2002 states

“methods of drainage other than

connection to a public surface water

sewer are encouraged where they are

technically feasible.”

The Code for Sustainable Homes

February 2008. Department for Communities and Local GovernmentCategory 4: Surface water run off

This deals with the management

of surface water run-off from

developments, the stated aim being:

“To design housing developments

which avoid, reduce and delay the

discharge of rainfall to public sewers

and watercourses.”

Further reference

communities.gov.uk

defra.gov.uk

ciria.org

Further reference

wrcplc.co.uk (Sewers for Scotland, 2nd edition)

sepa.org.uk(Scottish Environment Protection Agency)

sbsa.gov.uk(Scottish Building Standards Agency)

scottishwater.co.uk


1312

Applications

A p p l i c a t i o n s


Permeable Geotextile fleece

Pipe connector

Impermeable membrane

110mm/160mminlet pipe

Waterloc250 cells

110mm/160mmoutlet pipe

Silt trap with inlet filter

Flow control chamber fitted with Flowloc vortex control unit or orifice plate assembly

Fig 2

Waterloc250 cells

110mm/160mminlet pipe connections

Riser(cut to suit)

Permeable Geotextile fleece

Optional inlet/inspection chamber

Lid & frame

Side inlet 110mm-300mm connections

Cell clip

Top layer cell connector


Infiltration

Infiltration systems are designed to provide temporary storage

of surface water run off while natural dispersion into the

surrounding soil takes place. Conventional soakaways are

the most common example of below ground infiltration.

The high void area of Waterloc250 (96%) means that a third

of the volume is required compared with a conventional

gravel/shingle filled soakaway. The success of any infiltration

installation is wholly dependent on the permeability of the

surrounding soil. Waterloc250 cells require a geotextile

wrapping in accordance with the specification in appendix

one, (page 28) Figure 1 shows a typical infiltration soakaway.

Pipe connections can be made to the tank using side inlet

connectors or via the unique Marley inlet chamber when

incorporated in the design. The inlet chamber additionally

provides access to the tank for inspection and cleaning. Inlet

chambers can be used purely as access for inspection. Multiple

chambers may be appropriate for larger schemes.

Attenuation

Designed to store stormwater temporarily in a suitable

chamber below ground and release it at a pre-determined

rate via a vortex flow control unit, such as the Marley

Flowloc or an orifice plate. This limits the peak flow of water,

thereby reducing the likelihood of overloading pipelines or

watercourses downstream. The sizing of the attenuation tank

is critical, to allow sufficient capacity to prevent upstream

flooding. The Marley Technical Services team offer a design

service to assist with this calculation. Attenuation tanks must

be encapsulated within an impermeable membrane and

geotextile in accordance with the specification in appendix

one, (page 28). Increasingly, as sewer networks approach

capacity, attenuation techniques can offer a cost effective

solution for accommodating additional catchment areas

without increasing the size of the sewer.

Fig 1


1514

Hydraulic design

H y d r a u l i c d e s i g n


Rainfall intensity and duration

The level of rainfall a drainage system must cope with varies with the storm

duration, the return period of the storm, and the geographical location.

Storm durationRainfall intensity varies inversely with the duration of the rainfall, i.e. the shorter the

duration the more intense the rain will be. For conventional underground drainage it

is common to assume a 3 – 5 minute time of entry to the drainage network, and then

add to this the time of flow to obtain the duration. When the outflow is restricted,

either by a control device, or by the requirement for infiltration to take place, the

critical duration increases. It is therefore important with any storage or infiltration

design to determine the critical duration.

Return periodThe intensity of a storm is not only governed by its duration, but also how frequently

it could be expected to occur. Statistically a storm that occurs every week will be

significantly lower in intensity than a storm which will only occur once every 100

years. It is not possible to guarantee that a system will not be overwhelmed, but by

selecting a longer storm return period, the designer can reduce the risk factor, (there

is a 3650 to 1 chance of a 10 year event happening tomorrow, but a 36,500 to 1

chance of a 100 year event happening). Guidance is available from statutory bodies

with regard to return periods. Table 1 gives some of the range of values:

Source Applicable to Return period (yrs)

Part H, Building Regulations1 Infiltration 10

BS EN 752 – 4 : 20082 Infiltration & Attenuation 30

Sewers for adoption 63 Attenuation 30

Environment agency Infiltration & Attenuation 100

Environment agency‡ Infiltration & Attenuation 100+20%

‡ Some Environment Agency offices demand 100 years + 20% on top of calculated rainfall, which is equivalent to 250 years.

LocationThe location of the site can have a significant influence on the level of rainfall

intensity. Generally the western side of the UK experiences higher levels of longer

duration rainfall. The design guidance used by most designers to ascertain rainfall

intensity is the Wallingford Procedure4, which gives methods for determining the

rainfall intensity in any given location based on return period, duration and location.

The method given is fairly complex, and a computerised solution is generally used.

Waterloc250 can be designed for use in either infiltration or attenuation

applications. The design methods will however differ for each application.

InfiltrationInfiltration is the process of temporarily storing water and allowing it to slowly disperse

into the ground and can be designed using one of two methods:

BRE 3655 is the traditional method for soakaway design, and uses only the sides of the

soakaway for design purposes, assuming that the base will silt up over a period of time. The

calculation methods are fairly simple, but the lack of consideration of the base leads to long

thin trench soakaways as the most efficient configuration for this method.

CIRIA 1566 is a more modern method, which allows the base as well as the sides to be

used for infiltration. To counter the effects of siltation, safety factors can be introduced,

depending on the risk of failure. The CIRIA design method leads to shallow, flat

soakaways, which are usually better suited to Waterloc250 installations.

AttenuationAttenuation is the process of retaining water on site, before gradually releasing it into

a sewer or watercourse at a controlled flow rate.

The required storage volume for an attenuation system can be determined using the

following equation:

It is recommended that this calculation must be repeated at a number of time steps

between 5 minutes and 48 hours to determine the critical duration, i.e. the duration

which gives the greatest requirement for storage. The smaller the time step, the more

accurately this maximum value will be determined.

The level of allowable discharge from the site will vary depending on where the site is and

what its previous use was, (brown or green field). Most authorities will not want to accept

the full run off. The Environment Agency will often ask for discharge to be reduced to

5 litres per second per hectare (10,000m2) in a 100 year event for an ex-greenfield site.

This would only equate to approximately 2% of the unrestricted discharge from the

site, and so could require considerable storage. For brownfield sites, the designer must

prove how much water previously discharged from the site, and then discuss with the

Environment Agency or Water Authority to agree an acceptable discharge. The acceptable

discharge is often less than the peak flow from site before re-development.

Whichever infiltration design

method is used, there are

a number of important

considerations for soakaways:

‧ They must half empty in 24

hours or less, to ensure that

if another major storm occurs

shortly after the first, the system

will be able to cope with it.

‧ They must be located a

minimum distance of 5m

from the nearest building, to

protect building foundations

from damage.

‧ They must be wrapped in a

geotextile fleece to ensure that

surrounding soil does not

migrate into the soakaway

void, reducing its effectiveness.

See appendix one, page 28.

‧ It is vitally important that an

accurate soil infiltration rate

is established by site testing.

A detailed test method is

provided in BRE3655.

‧ There should be a minimum

of 1m between the highest

predicted groundwater level

on the site, and the bottom

of the soakaway.

Inflow (m3/min) x Duration (min) – Outflow (m3/min) x Duration (min)= Storage Volume (m3)

References

1 Approved document H, The Building Regulations 2000, Her Majesty’s Stationery office, 2000, ISBN 0 11 753607 5

2 BS EN752-4:2008 Drain and sewer systems outside buildings – Part 4: Hydraulic design and environmental considerations, BSI, 2008, ISBN 978 0 580 55750 7

3 Sewers for adoption – a design and construction guide for Developers, Fifth edition, WRc, 2001, ISBN 1 898920 43 5

4 Design and analysis of urban storm drainage – The Wallingford Procedure, Volume 1, Department of the Environment, National Water Council Standing Technical committee reports No. 31., 1981, ISBN 0 90109 031 X

5 Soakaway Design – BRE Digest 365, Building Research Establishment, Garston, Watford, WD2 7JR, 2007, ISBN 1 86081 604 5

6 Infiltration drainage – Manual of good practice, CIRIA Report 156, CIRIA, 6 Storey’s Gate, London, SW1P 3AU, 1996, ISBN 0 86017 457 3

Return periods Table 1


1716

D e s i g n


Air venting

A vent pipe may be required on some installations depending on the configuration (see examples on page 24-27).

Venting pipework can be constructed using standard components from the Marley underground and soil ranges.

Systems with a single 110mm inlet do not generally require venting. For installations up to 60m3, a 110mm vent is adequate.

Design

UG61 Filter

USW30600mm Silt trap

UG60 250mm Silt trap

USW29Filter

Flow control

The benefit of using the Marley Flowloc vortex flow control

unit is that the discharge rate varies less with changes in the

head of water in the tank. Orifice plates operate by reducing

the flow area to a much smaller proportion of its original

size, thereby constricting the flow rate. See appendix two for

performance tables, page 29.

Filtration

Central to the function of any infiltration or attenuation

storage system is the protection of the cells and flow control

components from the ingress of debris and silts.

For a smaller installation, a 250mm silt trap, UG60 can be

installed upstream of the storage system. For improved

protection, the UG61 filter can be added, which will retain

debris as small as 5mm.

Larger schemes benefit from a 600mm silt trap, USW30, which

can be used with or without the USW29 filter which will retain

debris particles as small as 10mm.

Sizing calculations for infiltration & attenuation systems

The easiest way to calculate the required size of stormwater management systems

is by using tailored computer software. Marley Plumbing & Drainage can offer this

service using software which is capable of assessing rainfall for any duration and

return period anywhere in UK. Those involved with the construction industry can

take advantage of the Marley stormwater design services, provided a commitment

is made to specify and use Marley Plumbing & Drainage products.

Soakaways for smaller catchment areas (e.g. single house) can be sized using the

recommendations in BS EN 752 – 4 : 2008 National Annex NG (Drain & sewer

systems outside buildings). The guidance states that the soakaway should have

a capacity equal to 20mm of rainfall over the area being drained. This method

assumes that the local soil conditions offer low permeability and therefore

stormwater will need to be stored in the soakaway following high intensity storms.

The table below shows the effective height increments of the Waterloc250 cell for use when calculating storage volume.

Number of layers Overall effective height mm

1 290

2 550

3 810

4 1070

5 1330

6 1590

7 1850

8 2110

9 2370

10 2630

11 2890

12 3150

13 3410

Effective Height

Design factors checklistFor accurate sizing of infiltration and

attenuation systems it is vital that

site specific input data is provided to

enable the relevant calculations to

be made. The following information

is required for sizing a soakaway or

attenuation system:

1. The calculation method to be

used (BRE or CIRIA)

2. The geographical location of

the site (for selection of local

rainfall statistics)

3. The storm profiles to be used

(return period in years)

4. The catchment areas

discharging into the

stormwater system (roofs and

other hard surfaced areas)

5. Soil infiltration rate (derived

from porosity tests conducted

on the site)

6. Allowable outflow rate,

litres/second (for attenuation

systems)

7. Safety Factor to be applied

which is normally agreed

with the Local Authority,

Environment Agency or Water

Company (dependent on

consequence of flooding)


1918

Structural design

S t r u c t u r a l d e s i g n

Light duty applicationsLandscaped (Non trafficked areas)

Medium duty applicationsCar parks and areas limited to vehicles of 9000kg G.V.W

Heavy duty applicationsHGV’s up to 44,000kg G.V.W(Slow moving traffic only)

Structural design considerations

The philosophy of limit state design is used for storage

tanks, which should be designed to safely support the

imposed loads, but allowing for the properties of plastic.

The concept of limit state design is to consider the

probability distributions of all parameters (applied loads

and material strength and stiffness) to provide better

control over risk than traditional design methods.

The two most common limit states to be considered are:

1. Ultimate limit state - the structure should not become

unstable or collapse under working loads or

foreseeable overload.

2. Serviceability limit state of deflection - deflections

of the units and the surrounding ground should be

at acceptable levels (for example to prevent surface

deformation).

Further advice can be found in CIRIA document C680,

Structural design of modular geocellular drainage tanks.

S Wilson: 2008.

Waterloc250 has been extensively tested to verify the

following structural performance figures.

Site topographyWhere installations are located adjacent to the foot of an embankment or slope, consideration must be given to the increased lateral loading that will be exerted on the cells and the maximum depth may need to be adjusted as appropriate. Guidance on this can be found in the CIRIA guide C680.

Construction plantA minimum of 300mm cover must be applied before mechanical compaction can take place. Abnormal construction traffic must be prevented from crossing the tank and in particular cranes and other similar plant should not be located over the tank unless a specific site assessment has been undertaken. Once surfacing is complete, heavy construction traffic should be prevented from passing over the installation unless the design specifically allows for this.

Property Vertical loading Lateral loading on top face on side face

Short term characteristic compressive strength 350kN/m2 82kN/m2

Short term load to cause 1mm deflection 47kN/m2 7kN/m2

Structural performance figures

(1) Assumed angle of shearing resistance of surrounding soil in accordance with CIRIA C680. The design is very sensitive to small changes in the assumed value of Ф, therefore, it should be confirmed by a chartered geotechnical engineer.

(2) Where physical barriers are provided to prevent access to HGV’s. if this cannot be guaranteed the structure should be designed to cope with HGV loading.

(3) Assumes a reinforced concrete slab is constructed over the installation.

(4) Maximum recommended depth of Waterloc 250 installations.

Minimum Cover (m) 0.5 0.75 1.0

24° 2.86 2.56 2.26

26° 3.07 2.77 2.47

28° 3.30 3.00 2.70

30° 3.56 3.26 2.96

32° 3.85 3.55 3.25

34° 4.0(4) 3.86 3.56

36° 4.0(4) 4.0(4) 3.92

38° 4.0(4) 4.0(4) 4.0(4)

Maximum Installation Depth (Finished ground level to base of cells) (m)

(Ф)(1)

(see note 1)Applications

(non-trafficked areas)Car Parks and areas limited to

vehicles of 9000 kg GVW(2)

Area subject to HGV’s up to 44,000kg GVW

(slow moving traffic only)(3)

Maximum installation depths (to base of cells) and minimum cover depths of Waterloc250 cells

Installation depths and coverFor infiltration applications the base level of the geo-cellular units must be at least one metre above the maximum water table level. For attenuation systems it is recommended that geo-cellular units are not installed below the maximum water table level to avoid the risk of floatation.


2120

Installation data


I n s t a l l a t i o n d a t a

Fig 1

Fig 2

Fig 3 Fig 5Fig 4 Fig 6

Waterloc250

The base or first layer of Waterloc250 cells in any installation must first have the base plate fixed to the base of the cell. Because each Waterloc250 cell interlocks vertically, cells on subsequent layers do not require a base plate. The cell should be inverted and the base plate pushed into place (fig 1), making sure the alignment arrows on the cell and the base plate are reversed. The base plate has four clips that locate into the internal pillars of the cell.

The base layer of cells are positioned on the prepared sharp sand bed once the geotextile or impermeable membrane (depending on the application) has been laid. The cells should be positioned so that the alignment arrows point in the same direction.Cell edges should butt together and intersecting corners align. The perimeter of adjacent cells must then be secured using the cell clip.

The cell clip can also be used between cells on the base layer, to aid the rigidity of the installation.

Further layers of cells are built up by rotating the cells by 180° so that the alignment arrows on successive layers alternate. No further clips are required on intervening layers as the cells interlock vertically, however the cell clip can be used to link the structure.

Note: once the cell clip is fitted, it cannot be easily removed.

The whole construction should be secured by fitting the top cell connector around the edges of the cells and at all intersecting points (fig 2).

Pipe connections

Marley offer a number of options for inlet and outlet pipe connections, from 110mm to 300mm. The WLRE250 can be used for 110mm and 160mm solid wall pipe or 150mm structured wall Quantum pipe. The WLRE250L or M can be used for 225mm and 300mm structured wall Quantum pipe.

110mm, 150mm & 160mm connector, WLRE250.

225mm & 300mm connectors, WLRE250L WLRE250M

To fit the connector, locate the two mounting plate legs into the rim of the cell and position the upper lugs so that they align with the vertical slots of the cell. Guide the lugs into the slots and snap into position.

Pull the impermeable membrane and/or geotextile taut over the spigot of the mounting plate and use the spigot as a cutting guide to make a close fitting hole in the material.

For attenuation tanks, the impermeable membrane should be sealed by applying a double bead of silicone sealant to the face of the mounting plate and between the membrane and the flange of the spigot. If using 160mm or 150mm pipes, remove the 110mm spigot section.

Pull the material tight to the mounting plate and fit the connector so that the keyway recess aligns with the key on the plate. Then fit the screws through the material so that they securely clamp the spigot to the mounting plate. The spigot orientation can be reversed to suit inlet or outlet connections.

These connectors are fitted in a similar manner, except that the mounting plates span the height of two cells, fixing into the top of the upper cell and the base rim of the lower cell.

Type Quantum D (mm) Pipe Size

WLRE250L 225 290

WLRE250M 300 370


2322

Installation data


I n s t a l l a t i o n d a t a

Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork.

Flow controller withdrawal handle

Polythene membrane bond breaker

OVERFLOW LEVEL

Ø50mm Overflow pipe

Ø 110/160mm rocker pipe

Ø 110/160mm inlet

Ø600mm riser kit including clamps and seal. (USW301, USW32 & USW33)

Riser clamps

150mm min granular surround

Filter withdrawal chain

600mm

Flowloc vortex flow controller size to suit required discharge rate

150mm concrete bed & surround

Flowloc chamber

Inlet filter box

600mm silt trap and Flowloc chamber base

The USW30 can be used as a 600mm silt trap, with or without the USW29 filter. It is also used as the housing for the range of Flowloc control units and orifice plates.

The chamber base can be installed within a precast concrete manhole or with a riser piece (available as part of the Waterloc range.) Both installation methods require the base to be level and bedded into a 150mm concrete base and surround. The base has spigot connections suitable for either 110mm or 150mm pipe sizes at the inlet and outlet, with additional 110mm side connections for use in ‘off-line’ installations. All pipe connections should be fitted with 600mm long rocker pipes to allow for ground movement.

Filter

Attach the end of the filter chain to the inside of the riser with the ‘P’ clip and screw provided, then lower the filter into the base so that it locates against the inlet.

Flowloc vortex flow control unit

Using the solvent cement supplied with the kit, bond the 20mm pipe socket to the length of 20mm pipe, then bond the socket to the handle attachment on the Flowloc device. Allow the solvent to set before lowering the controller into the base and engaging the square flange into the coupling slot. The handle can be cut to length.

To set the overflow level, fit the 50mm pipe into the socket in the chamber base aluminium coupling and mark the pipe at a point coinciding with the top, or just below the top of the storage tank. Cut the pipe at this point and bond into the socket with solvent cement, then secure the open end to the inside of the riser wall with the pipe clip and screws provided.

Chamber Riser

To fit the 600mm riser to the chamber base, fit the inlet ring seal into the first corrugation of the riser, lubricate the seal with silicone grease and insert fully into the socket of the base with firm pressure. Fit the clamp ring between the grooves of the base socket and locate the four clamps in the corrugations of the riser before tightening.

Prior to backfilling with granular material, leak test the seal by capping the inlet and outlet connections and filling the riser with water to approximately 0.5m above the seal.

The riser should be cut back to within approximately 200mm of finished ground level before casting a concrete collar with a bond breaker membrane around the riser to prevent load transfer to the shaft. A cast iron inspection cover and frame with a minimum clear opening of 750mm can then be set on engineering brickwork to complete the installation.

250mm silt trap, UG60

The 250mm silt trap, UG60 can be used with or without a filter, UG61. The 250mm silt trap must be installed with the flow indication arrow in the base of the unit in line with the direction of flow. This will ensure that the filter is always correctly located against the inlet connection, and that the UG60 leaf guard is fitted to the outlet.

The silt trap should be installed with a pea shingle bed and surround at the appropriate depth. The riser is then trimmed back to suit the ground level, before the UCL2/3 cover and frame is bonded in place with solvent cement. When inserting the filter into the UG60, make sure that the base is positioned against the location ramps and that the wire retainer is lowered to lock it into position.

How many top layer cell connectors or cell clips are needed for an installation?

The above table indicates the maximum number of top layer cell connectors required for an installation (shown in green). The connectors are required at each intersection, but for the top layer only. The numbers shown in red are the minimum number of cell clips required, calculated on the perimeter of the base layer.

No.

of

cells

– w

idth

No. of cells – length

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

1 0/0 2/2 4/4 6/6 8/8 10/10 12/12 14/14 16/16 18/18 20/20 22/22 24/24 26/26 28/28 30/30 32/32 34/34 36/36 38/38

2 5/4 8/6 11/8 14/10 17/12 20/14 23/16 26/18 29/20 32/22 35/24 38/26 41/28 44/30 47/32 50/34 53/36 56/38 59/40

3 12/8 16/10 20/12 24/14 28/16 32/18 36/20 40/22 44/24 48/26 52/28 56/30 60/32 64/34 68/36 72/38 76/40 80/42

4 21/12 26/14 31/16 36/18 41/20 46/22 51/24 56/26 61/28 66/30 71/32 76/34 81/36 86/38 91/40 96/42 101/44

5 32/16 38/18 44/20 50/22 56/24 62/26 68/28 74/30 80/32 86/34 92/36 98/38 104/40 110/42 116/44 122/46

6 45/20 52/22 59/24 66/26 73/28 80/30 87/32 94/34 101/36 108/38 115/40 122/42 129/44 136/46 143/48

7 60/24 68/26 76/28 84/30 92/32 100/34 108/36 116/38 124/40 132/42 140/44 148/46 156/48 164/50

8 77/28 86/30 95/32 104/34 113/36 122/38 131/40 140/42 149/44 158/46 167/48 176/50 185/52

9 96/32 106/34 116/36 126/38 136/40 146/42 156/44 166/46 176/48 186/50 196/52 206/54

10 117/36 128/38 139/40 150/42 161/44 172/46 183/48 194/50 205/52 216/54 227/56

11 140/40 152/42 164/44 176/46 188/48 200/50 212/52 224/54 236/56 248/58

12 165/44 178/46 191/48 204/50 217/52 230/54 243/56 256/58 269/60

13 192/48 206/50 220/52 234/54 248/56 262/58 276/60 290/62

14 221/52 336/54 251/56 266/58 281/60 296/62 311/64

15 252/56 268/58 284/60 300/62 316/64 332/66

Number of top layer cell connectors / Number of cell clips

Cell Clip

WLRCI250


WLRC250


2524

Typical installation details

Ty p i c a l d e t a i l s

Soakaway with inlet filter and provision for inspection of tank via inlet chamber in a landscaped area


Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork



Ø 600mm riser kit including clamps & seal (USW301, USW32 & USW33)

Inlet filter box (USW29)

Silt trap (USW30) 150mm concrete bed & surround

110/160mm pipe

Permeable geotextile fleece as approved

Marley Waterloc250 cells (WLRB250)

Base grid (WLRP250) Central column of cells omitted to form inspection void

100mm sharp sand base


Soakaway – volume & configuration as notedAdaptor tray (UMF22)

Inlet chamber (UMF21)

Marley 450mm access cover & frame (UCL35, ECL35PP or UCL125)

Riser section (UCR2)

Multi spigot side connector (WLRE250)

Attenuation tank with inlet filter and Flowloc vortex flow control unit

Soakaway with 250mm silt trap and filter



Ø600mm Riser Kit Including Clamps & Seal (USW301, USW32 & USW33)

Inlet filter box(USW29)

Ø110/160mm Inlet

Ø110/ 160mm

Geotextile protection fleece

100mm sharp sand base Impermeable membrane

by butyl or similar approved

Base grid (WLRP250)


Multi spigot side connector with membrane clamp(WLRE250)

Inlet filter box

Flowloc chamber150mm concrete bed & surround


Controlled release to drainage system


Ø110/160mm rocker pipe

Ø50mm Overflow pipe

OVERFLOW LEVEL

Flow controller withdrawal handle



Filter withdrawalchain


Ø600mm riser kitIncluding clamps and seal. (USW301, USW32 & USW33)

Riser clamps

Attenuation tank - volume & configuration as required

Multi spigot side connector with membrane clamp (WLRE250)


Silt trap(USW30) 150mm concrete

bed & surround

600mm

Marley 250mm access cover& frame (UCL2, UCL3)

Silt trap (UG60)with optionalinlet filter (UG61)

110mm pipe

Permeablegeotextilefleece asapproved

Base grid (WLRP250)Marley waterloc 250cells (WLRB250)



Soakaway – volume &configuration as noted

Multi spigot side conector(WLRE250)

Attenuation tank with inlet filter and provision for inspection of tank via inlet chamber in a landscaped area


Multi spigot side connector (WLRE250)



Ø600mm riser kit including clamps & seal (USW301, USW32 & USW33)


Silt trap(USW30) 150mm concrete

bed & surround

110/160mm pipe



Impermeable membrane by butyl or similar approved

Base grid (WLRP250)


Central column of cells omitted to form inspection void


Inlet filter box

Flowloc chamber150mm concrete bed & surround

Flowloc vortex flow controller (sized to suit required discharge rate)


Rocker pipe


50mm overflow pipe

OVERFLOW LEVEL

600mm


Flow controllerwithdrawal handle



Ø600mm riser kitIncluding clamps & seal(USW301, USW32 & USW33)

Riser clamps

Soakaway tank – volume & configuration as noted

Adaptor tray (UMF22)

Inlet chamber (UMF21)

Marley 450mm access cover & frame (UCL35, UCL35PP)

Riser section(UCR2)

600mm

*Available to download as CAD files from marley.co.uk


2726

Typical installation details

Ty p i c a l d e t a i l s

Level invert to attenuation tank using Marley Quantum fully slotted twin wall pipe and air vent

Off line attenuation tank with air vent and Flowloc vortex flow control unit

Marley Flowloc chamber with concrete riser and Flowloc vortex flow control unit


See marley.co.uk for the complete range of fully detailed CAD drawings.

110mm air vent pipe & cowl (SVC1) terminated at a suitable location above ground

Clark drain or similar 750mm sqInspection cover & frame set onconcrete slab and brickwork.

Flow controllerwithdrawal handle

Pre-cast concretering and cover(by others)

Step rungs or accessladder as required

OVERFLOW LEVEL

Ø50mm overflow pipe

Ø110/160mm rocker pipe



Flowloc chamber

Inlet filter box

Ø110/160mm inlet

Concrete benching

150mm concretesurround




Attenuation tank - volume & configuration as noted




110mm air vent pipe& cowl (SVC1)

110mm transfer pipe

Inlet filter box

160mm inlet

Marley flowloc vortexflow controller (sized to suit required discharge rate)

110mm controlled release to drainage system

Base grid (WLRP250)

Marley waterloc250 cells (WLRB250)

Multi spigot side connector with membrane clamp(WLRE250)

Flowloc chamber



Polythene membrane bond breakerOverflow

level

Ø600mm riser kit including clamps & seal (USW301, USW32 & USW33)

110mm air vent pipe & cowl (SVC1) terminated at a suitable location above ground


Attenuation tank

Geotextileprotectionfleece

Inlet from upstreamchamber

Seal the membraneto coupler


100mm sharp sand bed

150, 225 or 300mm fully slotted twin wall pipe

Quantum pipe coupler

Outlet to controlledrelease chamber

Granular bed & surround to pipe

Marley Waterloc250 cells(WLRB250)

Geotextileprotectionfleece


Granular bed & surround to pipe

Secondary geotextile wrapto retain granular material

600mm

Riser clamps

Level invert attenuation tank with air vent, inlet filter and Flowloc vortex flow control unit



600mm riser kit including clamps & seal (USW301, USW32 & USW33)


Silt trap(USW30)


110/160mm pipe


Base grid (WLRP250)



Inlet filter box

Flowloc chamber



110/160mm rocker pipe


50mm overflow pipe

OVERFLOW LEVEL



Filter withdrawalChain

600mm riser kit including clamps & seal (USW301, USW32 & USW33)

Riser clamps

Attenuation tank - volume & configuration as noted


Polythene membranebond breaker


110mm air vent pipe & cowl (SVC1) Flow controller withdrawal handle

Marley flowloc vortex flow controller (sized to suit required discharge rate)


600mm

*Available to download as CAD files from marley.co.uk


2928

Appendix One

Property Typical value Test method

Fabric 100% PES 1100dtex

Weight 1100 g/m2 DIN EN 2286-2 1998

Breaking strength Warp 4000 N/5cm EN ISO 1421 1998 Weft 3500 N/5cm

Tear strength Warp 600 N DIN 53363 2003 Weft 500 N

Adhesion 125 N/5cm EN ISO 2411 2000

Waterproofness > 200 kPa NFG 37106 1986

Temperature resistance -30 deg. C to +70 deg. C DIN EN1876-2 1998

Light fastness 7-8 ISO 105 B02 1988

Fire behaviour <100 mm/minute ISO 3795 1989

Nylon reinforced PVC

Impermeable membrane specification

Property Typical value Test method

Weight 250g/m2 EN 965

Thickness 2.3mm EN 964-1 2kPa

CBR puncture resistance 3000N EN ISO 12236

Tensile strength md 16.6kN/m EN ISO 10319 (average values) xd 18.3kN/m

Elongation md 50% EN ISO 10319 xd 55%

Cone drop test 13Mm EN 918

Pore size 90um EN ISO 12956

Water flow rate 85 l/m2.s EN ISO 11058

Permeable geotextile specification

Maintenance Appendices

Infiltration and attenuation tanks using Waterloc250

Where provision has been made for inspection of the tank, it should be periodically checked for build up of silts in the base. If there is evidence that silts or larger debris particles have settled in the tank, it should be partially filled with clean water which will loosen the lighter material and bring it into suspension before drawing the water out with a suitable sump pump. High pressure jetting hoses should not be used to carry out cleaning as these might damage the tank liner.


Ideally, a maintenance programme should be set up to ensure that the Flowloc control system is regularly checked and cleaned. The filter unit should be periodically raised to ensure that collected debris does not obstruct the inlet to the chamber base. Any debris can be removed via the inlet port at the back of the filter box. Before replacing the filter it is advisable to clean out the base of the chamber with a suction pump to ensure that the filter seats correctly on replacement. The Flowloc controller or orifice plate should be periodically removed for inspection and cleaning, and the base coupling hosed out to ensure correct seating on replacement.

250mm silt trap

UG60 traps should be regularly maintained by removing the leaf guard from the outlet and discarding any debris from the base of the trap. To clean the UG61 filter, raise the wire retainer on the filter, tilt forward and pull out by the handle. Remove the lid by pressing the release catch and thoroughly clean the unit with a hose. Remove any collected silt from the base of the trap, replace the filter and lock into place by lowering the wire retainer.

Product code USW40 USW50 USW60 USW70 USW80 USW90Cell height (m) Water head (m) 2.50 3.00 3.60 4.30 5.20 7.00 0.5 0.55 2.59 3.10 3.75 4.45 5.25 7.05 0.81 3.00 3.45 4.20 5.25 6.35 8.25 3.20 3.70 4.80 5.80 7.00 9.00 1.0 1.07 3.25 3.80 4.95 6.00 7.20 9.30 1.33 3.39 4.20 5.45 6.60 7.98 10.30 3.40 4.40 5.60 7.00 8.40 10.90 1.5 1.59 3.42 4.50 5.75 7.20 8.65 11.20 1.85 3.75 4.85 6.05 7.80 9.60 12.05 3.80 5.00 6.20 8.10 9.80 12.50 2.0 2.11 3.85 5.10 6.35 8.30 10.06 12.85 2.37 3.95 5.30 6.65 8.80 10.58 13.65 4.00 5.40 6.80 9.00 10.80 14.00 2.5 2.63 4.20 5.50 6.90 9.20 11.05 14.40 2.89 4.30 5.65 7.15 9.40 11.45 15.10 4.40 5.70 7.20 9.50 11.60 15.40 3.0 3.15 4.45 5.75 7.25 9.60 11.78 15.75 3.41 4.59 5.79 7.35 9.65 11.85 16.45 4.60 5.80 7.40 9.70 12.00 16.50 3.5 3.67 4.61 5.80 7.41 9.80 12.10 17.81

Product code USW415 USW420 USW425 USW430 USW435 USW440 USW445 USW450 USW455 USW460 USW465 USW470 USW475 USW480 USW485Orifice dia mm 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85Cell height (m) Water head (m)

0.34 0.61 0.95 1.37 1.87 2.44 3.09 3.81 4.61 5.49 6.44 7.47 8.58 9.76 11.02 0.5 0.55 0.36 0.64 1.00 1.44 1.96 2.56 3.24 4.00 4.84 5.76 6.76 7.84 9.00 10.24 11.56 0.81 0.44 0.78 1.21 1.75 2.38 3.11 3.93 4.85 5.87 6.99 8.20 9.51 10.92 12.42 14.03 0.49 0.86 1.35 1.94 2.64 3.45 4.37 5.39 6.52 7.76 9.11 10.57 12.13 13.80 15.58 1.0 1.07 0.50 0.89 1.39 2.01 2.73 3.57 4.52 5.58 6.75 8.03 9.43 10.93 12.55 14.28 16.12 1.33 0.56 0.99 1.55 2.24 3.05 3.98 5.04 6.22 7.52 8.95 10.51 12.19 13.99 15.92 17.97 0.59 1.06 1.65 2.38 3.24 4.23 5.35 6.60 7.99 9.51 11.16 12.94 14.86 16.91 19.09 1.5 1.59 0.61 1.09 1.70 2.45 3.33 4.35 5.51 6.80 8.23 9.79 11.49 13.33 15.30 17.41 19.65 1.85 0.66 1.17 1.83 2.64 3.59 4.69 5.94 7.33 8.87 10.56 12.39 14.38 16.50 18.78 21.20 0.69 1.22 1.91 2.75 3.74 4.88 6.18 7.63 9.23 10.98 12.89 14.95 17.16 19.52 22.04 2.0 2.11 0.70 1.25 1.96 2.82 3.84 5.01 6.34 7.83 9.48 11.28 13.24 15.35 17.62 20.05 22.64 2.37 0.75 1.33 2.08 2.99 4.07 5.31 6.72 8.30 10.04 11.95 14.03 16.27 18.68 21.25 23.99 0.77 1.36 2.13 3.07 4.18 5.46 6.91 8.53 10.32 12.28 14.41 16.71 19.18 21.83 24.64 2.5 2.63 0.79 1.40 2.19 3.15 4.28 5.60 7.08 8.74 10.58 12.59 14.78 17.14 19.68 22.39 25.27 2.89 0.83 1.47 2.29 3.30 4.49 5.87 7.43 9.17 11.09 13.20 15.49 17.97 20.63 23.47 26.49 0.84 1.49 2.33 3.36 4.58 5.98 7.57 9.34 11.30 13.45 15.78 18.31 21.01 23.91 26.99 3.0 3.15 0.86 1.53 2.39 3.45 4.69 6.12 7.75 9.57 11.58 13.78 16.17 18.76 21.53 24.50 27.66 3.41 0.90 1.59 2.49 3.58 4.88 6.37 8.07 9.96 12.05 14.34 16.83 19.52 22.40 25.49 28.78 0.91 1.61 2.52 3.63 4.94 6.46 8.17 10.09 12.21 14.53 17.05 19.77 22.70 25.83 29.15 3.5 3.67 0.93 1.65 2.58 3.72 5.06 6.61 8.37 10.33 12.50 14.88 17.46 20.25 23.24 26.45 29.85


Orifice plate flow control unit

Appendix Two – Performance data (l/s)

flow rate (l/s)

flow rate (l/s)


3130

Description Code

Waterloc250 cell WLRB250 Size mm A B C Colour 1200 800 290 Black

Base plate WLRP250 Size mm A B C Colour 1200 800 30 Black

Top layer cell connector WLRC250

Size mm A B C Colour 235 235 35 Sand

Cell Clip WLRCI250

Size mm A B Colour 100 62 Sand

Product information

P r o d u c t i n f o r m a t i o n

C

B

A

A

C

D

B

A

DCB

A

C

D

B

A

C

B

C

B

A

CA

B

A

Effective height

B

A

C

B

A

C

C

B

A

For use with WLRB250 on bottom layer only

Description Code

Inlet chamber UMF21 Size mm A B C D Colour 450 953 720 670 335 Black UMF22A adaptor tray must be used with this item

Adaptor tray UMF22A

Size mm A B C Colour 1385 985 100 Black

Chamber riser UCR2 Size mm A Colour 450 430 Black For use with inlet chamber. Riser is supplied with a ring seal.

Description Code

Inspection cover and frame Polypropylene non-trafficked UCL35PP

Cast-iron 3.5t (class A15) UCL35

Size mm Code A B C Colour 450 UCL35PP 547 494 70 Black 450 UCL35 517 490 40 Black

Silt trap UG60

Size mm A B C Colour 250 diameter 780 350 270 Orange Supplied with a leaf guard fitted to the outlet

Inlet filter UG61 Size mm A B C Colour 380 190 132 Stainless/black For use with UG60 silt trap

Description Code

110mm/160mm inlet/outlet pipe connector WLRE250 Size mm A B C D Colour 110/160 265 250 190 45 Grey

225mm Quantum inlet pipe connector WLRE250L 300mm Quantum inlet pipe connector WLRE250M Size mm A B C D Colour 225 551 415 306 245 Stainless/orange 300 551 415 386 165 Stainless/orange

A

B


3332

Product information

Description Size mm Code

Flowloc 40 USW40 50 USW50 US 60 USW60 US 70 USW70 US 80 USW80 90 USW90

Colour Black Includes vortex flow control unit, chamber base fitted with controller housing, inlet filter with chain and overflow pipe.

1085

612

815

380 57

5

325

300

240

A

A

B

B

A

C

A

B

C

B

A

Description Size mm Code

Orifice Plate 15 USW415 20 USW420 25 USW425 30 USW430 35 USW435 40 USW440 45 USW445 50 USW450 55 USW455 60 USW460 65 USW465 70 USW470 75 USW475 80 USW480 85 USW485

Colour Black Includes orifice plate flow control unit, chamber base fitted with controller housing, inlet filter with chain and overflow pipe.

The Aliaxis group of companies offer solutions for dealing with water in a sustainable way.

www.sustainablewatersolutions.com

For use with UG60 silt trap

Description Code

250mm Inspection cover and frame – circular UCL2 250mm Inspection cover and frame – square UCL3

Size mm A B C Colour 250 UCL2 280 70 – Black 250 UCL3 318 78 20 Black

Silt trap USW30 Size mm Colour 600 diameter Black

Inlet filter USW29 Size mm A B C Colour 500 500 230 Black/stainless With lifting chainFor use with USW30 silt trap

Description Code

Riser kit x 1m USW301 Riser kit x 2m USW32 Riser kit x 3m USW33

Size mm A Colour 600 1000 Black 600 2000 Black 600 3000 Black Supplied with clamp and seal set

Perforated pipe UPP406 USH16 USH26 USH36 Size mm Code A B Colour 110 UPP406 128 70 Orange 150 USH16 175 90 Orange 225 USH26 275 125 Orange 300 USH36 340 110 Orange

34

Attenuation tank for Robertson Homes, Seaforth Road, Ayr

Head OfficeLenham, Maidstone Kent ME17 2DE Tel: 01622 858888 Fax: 01622 851111

Birkenshaw Industrial Estate Uddingston, Glasgow G71 5PA Tel: 01698 815231 Fax: 01698 810307

Export DivisionLenham, Maidstone Kent ME17 2DE England Tel: +44 (0)1622 858888 Fax: +44 (0)1622 850778

July 2013

marley.co.uk For general enquiries and details of your nearest stockist please call the customer services department: Tel: 01622 852585email: [email protected]

For Technical advice please call 01622 852695

drainage systems (sustainable drainage system)

Documents

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natural drainage

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