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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.
sustainable drainage systems
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.
sustainable drainage systems
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marley.co.uk Technical hotline: 01622 852695
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
sustainable drainage systems
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marley.co.uk Technical hotline: 01622 852695
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.
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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
marley.co.uk Technical hotline: 01622 852695
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
sustainable drainage systems
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Applications
A p p l i c a t i o n s
marley.co.uk Technical hotline: 01622 852695
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
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
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Hydraulic design
H y d r a u l i c d e s i g n
marley.co.uk Technical hotline: 01622 852695
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
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D e s i g n
marley.co.uk Technical hotline: 01622 852695
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)
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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.
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Installation data
marley.co.uk Technical hotline: 01622 852695
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
sustainable drainage systems
2322
Installation data
marley.co.uk Technical hotline: 01622 852695
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
Top layer cell connector
WLRC250
sustainable drainage systems
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
marley.co.uk Technical hotline: 01622 852695
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork
Polythene membrane bond breaker
Filter withdrawal chain
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
150mm min granular surround
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
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork.
Filter withdrawal chain
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)
Marley Waterloc250 cells (WLRB250)
Multi spigot side connector with membrane clamp(WLRE250)
Inlet filter box
Flowloc chamber150mm concrete bed & surround
Flowloc vortex flow controller size to suit required discharge rate
Controlled release to drainage system
150mm min granular surround
Ø110/160mm rocker pipe
Ø50mm Overflow pipe
OVERFLOW LEVEL
Flow controller withdrawal handle
Polythene membrane bond breaker
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork.
Filter withdrawalchain
150mm min granular surround
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)
Polythene membrane bond breaker
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)
100mm sharp sand base
150mm min granular surround
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
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork
Multi spigot side connector (WLRE250)
Polythene membrane bond breaker
Filter withdrawal chain
Ø600mm riser kit including clamps & seal (USW301, USW32 & USW33)
Inlet filter box(USW29)
Silt trap(USW30) 150mm concrete
bed & surround
110/160mm pipe
Geotextile protection fleece
150mm min granular surround
Impermeable membrane by butyl or similar approved
Base grid (WLRP250)
Marley Waterloc250 cells (WLRB250)
Central column of cells omitted to form inspection void
100mm sharp sand base
Inlet filter box
Flowloc chamber150mm concrete bed & surround
Flowloc vortex flow controller (sized to suit required discharge rate)
Controlled release to drainage system
Rocker pipe
150mm min granular surround
50mm overflow pipe
OVERFLOW LEVEL
600mm
Polythene membrane bond breaker
Flow controllerwithdrawal handle
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork
Filter withdrawalchain
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
sustainable drainage systems
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
marley.co.uk Technical hotline: 01622 852695
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 vortex flow controller size to suit required discharge rate
150mm concrete bed & surround
Flowloc chamber
Inlet filter box
Ø110/160mm inlet
Concrete benching
150mm concretesurround
Filter withdrawalchain
Multi spigot side connector with membrane clamp (WLRE250)
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork
Attenuation tank - volume & configuration as noted
Geotextile protection fleece
100mm sharp sand base
Impermeable membrane by butyl or similar approved
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
150mm concrete bed & surround
150mm min granular surround
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
Multi spigot side connector with membrane clamp (WLRE250)
Attenuation tank
Geotextileprotectionfleece
Inlet from upstreamchamber
Seal the membraneto coupler
Impermeable membrane by butyl or similar approved
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
Impermeable membrane by butyl or similar approved
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
Clark drain or similar 750mm sq inspection cover & frame set on concrete slab and brickwork
Filter withdrawal chain
600mm riser kit including clamps & seal (USW301, USW32 & USW33)
Inlet filter box(USW29)
Silt trap(USW30)
150mm concrete bed & surround
110/160mm pipe
100mm sharp sand base
Base grid (WLRP250)
Marley Waterloc250 cells (WLRB250)
Multi spigot side connector with membrane clamp (WLRE250)
Inlet filter box
Flowloc chamber
150mm concrete bed & surround
Controlled release to drainage system
110/160mm rocker pipe
150mm min granular surround
50mm overflow pipe
OVERFLOW LEVEL
150mm min granular surround
Polythene membrane bond breaker
Filter withdrawalChain
600mm riser kit including clamps & seal (USW301, USW32 & USW33)
Riser clamps
Attenuation tank - volume & configuration as noted
Multi spigot side connector with membrane clamp (WLRE250)
Polythene membranebond breaker
Geotextile protection fleece
110mm air vent pipe & cowl (SVC1) Flow controller withdrawal handle
Marley flowloc vortex flow controller (sized to suit required discharge rate)
Impermeable membrane by butyl or similar approved
600mm
*Available to download as CAD files from marley.co.uk
sustainable drainage systems
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.
Flowloc vortex flow control unit
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
Flowloc vortex flow control unit
Orifice plate flow control unit
Appendix Two – Performance data (l/s)
flow rate (l/s)
flow rate (l/s)
sustainable drainage systems
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
sustainable drainage systems
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