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Sustainable drainage systems

marley.co.uk

sustainable drainage systems

3

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 iondata

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.

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marley.co.uk Technical hotline: 01622 852695

The environment

Itisnowwidelyrecognisedthattheeffectsofclimatechangeandtheincreaseinthebuiltenvironmenthavenecessitatedchangestothewayinwhichstormwaterisdealtwith.

Sustainabledrainagesystems

(SUDS)provideaneffectivewayof

mimickingnaturaldrainagebefore

developmenttakesplace;whetherto

counteracttheeffectofoverloading

gravitypipelinesandwatercourses,

whichcancontributetoflooding

downstream;orconversely,dealing

withrainwaterrunoffonsiteto

replenishgroundwaterlevels,

particularlyintimesofwater

shortage.SUDSarenowatthe

forefrontofenvironmentalpolicy

andplanning.


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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

‧ Geocellularunitsareexceptionally

easytohandleonsite,allowing

rapidconstructionofthetank

‧ Themodularformatallowsflexibility

inthedesignofthetankplanarea

ordepthtosuitavailablespaceand

groundwaterlevels.

The advantages of below ground SUDS solutions:

‧ Lowspaceutilisation

‧ Nohealthandsafetyrisk

‧ Adaptabilitytosuitsiteconditions

‧ Lowvandalismrisk

‧ Lowmaintenance

‧ Asquareorrectangulartank

configurationminimisesthe

amountofexcavatedspoiland

simplifiesthebackfillingprocess

‧ Aporosityratioof96%minimises

theextentoftheexcavationforany

giventankvolume

Comparedwiththemoretraditionalmethodsofcreatingundergroundstormwater

storage,suchasconcreteringsorlargediameterpipesections,modularcellsoffer

somedistinctadvantages.

6


Key components

WLRC250 top layer cell connector

WLRB250 Waterloc250 cells

WLRC250 base perimeter 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

TheMarleyWaterloc250cellisidealforuseineitheranundergroundinfiltrationorattenuationsystem.96%ofthecellvolumeisavailabletostorewater,minimisingtheextentofexcavationrequiredfortheinstallation.Inaddition,theinnovativedesignofWaterloc250enablesthecellstobequicklybuiltintolayersandconfiguredtosuittheareaavailable.

Waterloc250 benefits

‧ Uniquenestingabilityofcells

reducesstorageonsiteand

transportationcosts

‧ Layersarequicklyassembledby

rotatingalternatecells180°

‧ Size(1200mmx800mmx290mm

high)andmodularnatureallowsfor

maximumflexibilitywherespace

isrestricted

‧ Exceptionalverticalandlateral

loadingcapability

‧ Opencellstructureallowsrapid

dispersionofwater

‧ Rangeofoptionsmakingpipe

connectionsquickandeasy

‧ FourWaterloc250cells=1m3

makingvolumecalculation

straightforward

‧ BBA11/4830certification


7

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

Waterloc250 key characteristics

Waterloc250hasliftingbarsandanarrowmouldedintothetopface.Thecells

areassembledbyrotatingthemby180°fromthenestedstack.Thecellconnector

actuallyconsistsoftwoclips;the‘pop-out’clipinthecentreisthebasecellclip,for

securingthebaselayer,theremainderisthetopcellconnector,requiredforthetop

layeronly.Noclipsarerequiredfortheintermediatecelllayers.

Pipeconnectionscanbemadetoallowinletandoutletconnectionsatanyposition

aroundtheperipheryofthetank.Aspecialfeatureofthespigotconnectorisascrew

fixedmountingplatethatenablesthegeotextileorgeomembranelinertobeeasilysealed

aroundtheconnectionpriortofittingthepipe.TheMarleyInletchamberalsoprovidesa

waterentrymethodand/oraccessforinspection.

Waterloc250cell connector, WLRC250

Property Verticalloading Lateralloading ontopface onsideface

Shorttermcharacteristiccompressivestrength 350kN/m2 82kN/m2

Shorttermloadtocause1mmdeflection 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.

Top layer cell connector

Base perimeter cell clip

Colour Black

Unitdimensions Length: 1200mm. Width: 800mm. Height 290mm*

Weight 12kg

Voidratio 96%

Storagevolume 250 litres

Storagecapacity 240 litres

Material Polypropylene

Waterloc250 specification overview

* Effective depth when installed in multiple layers: 260mm

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Key components

flowloc

600mm riser

Riser seal(fits in first riser

corrugation)

Riser clamp

110/160mmInlet spigot

Flowloc chamberbase

110/160mm

Overflow pipe

outlet spigot

Inletfilter

Flowloc vortex flow controller& withdrawalhandle

Alternative orificeplate & withdrawalhandle

FlowlocisaVortexflowcontrolunit,whichisusedaspartofanattenuationscheme.

‧ Heavydutyaluminiumflow

controllerandcouplingsystem,

electrocoatedforlongservicelife.

Availabletosuitawiderangeof

flowrates.(Refertoperformance

tablesinappendixtwoonpage29)

‧ Suppliedwithinachamber

basewithanintegratedfilter

providingprotectionagainst

controllerblockage

‧ Suitableforusewithtankdepths

upto4m

‧ Allcomponentsreadilyremovable

fromsurfaceforeaseofmaintenance

‧ Thechamberbaseisalsosuitable

forinstallationwithinaconventional

manentryinspectionchamber

ifrequired

Flowloccontrolstherateatwhichwaterisdischargedtoasurfacewaterdrainor

watercourse.LocalAuthoritiesorWaterCompaniesnormallysetanoutflowratefor

newdevelopments.

ThedesignofFlowlocisbasedontheprovenvortexprinciple,andenablesanear

constantdischargeratetobeachieved,independentoftheheadofwaterinthe

tank.Availabletoaccommodateflowratesrangingfrom2l/sto15l/s,Flowlocis

installedinachamberbasewithawithdrawalhandletoalloweasyaccessfromthe

surfaceformaintenance.Intheunlikelyeventofblockage,anoverflowpipeallows

watertobypassthecontrollertotheoutlet.

Anextensiverangeoforificeplateflowcontrolunitsarealsoavailablefor

applicationswhereverylowflowratesarerequiredorforhigherflowswhere

thereisalessstringentrequirementforcontrollingthewaterflowrate.


9

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

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

Inlet chamber, UMF21. Adaptor tray, UMF22A

Inlet/inspection chamber

TheMarleyinletchamberprovides

accesstothesoakawayorattenuation

schemeforinspectionandcleaning.A

columnofcellsisomittedbeneaththe

chambertoprovideaninspectionwell.

Thechamberisseatedintoanadaptor

tray(orderedseparately).Itcanalso

beusedasaninletconnectionor

connectionforanairvent.Forlarger

installations,multipleinletchambers

canbeused,butmustbeboundedon

allsidesbycells.

Silt traps

Availablein250mmand600mm,

withorwithoutadditionalfilters.It

isrecommendedthatallstormwater

drainagesystemsthatdischargeinto

infiltrationorattenuationtankshave

upstreamfiltrationtominimisethe

buildupofsiltandpreventtheingress

ofdebris.TheUG60,250mmsilttrap

issuitableforcatchmentareasupto

250m2.Forlargercatchmentareas,the

600mmsilttrap,USW30shouldbeused.

10

Regulations and guidance


Overrecentyearsanumberofstudies,recommendationsandguidancedocumentshavebeenpublished,allofwhichconsiderhowsustainabledrainageshouldbeencouragedandimplemented.Addedtothis,regulatoryguidanceisalsoevolving.

Planning Policy Statement 25 (PPS25)

December 2006. Department ofCommunities and Local Government

Development and flood risk

PublishedinDecember2006,PPS25

setsouttheGovernment’spolicyon

differentaspectsoflanduseplanning

inEngland.WithrespecttoSUDS,the

policydocumentstatesthat“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.”

The Pitt Review

Learning lessons from the 2007floods. Sir Michael Pitt.

Thisreportcontainsover90

recommendationsforbetterflood

riskplanninginEnglandandWales.

InDecember2008,theGovernment

providedaresponsetothereport.

Anumberoftherecommendations

concerntheuseandadoption

ofSUDS;“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

Governmentresponsewastosupport

thisrecommendationandstatethe

intentionthatLocalAuthoritieswill

beresponsibleforadoptingand

maintainingsustainabledrainage

systems(SUDS)inthepublicrealm.

Building Regulations

Department of Communities and Local Government

ApprovedDocumentH3:

Rainwaterdrainage,2002states

“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

Thisdealswiththemanagement

ofsurfacewaterrun-offfrom

developments,thestatedaimbeing:

“To design housing developments

which avoid, reduce and delay the

discharge of rainfall to public sewers

and watercourses.”


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

Specific advice for Scotland

InScotland,aspartoftheenablinglegislationrelatingtotheWaterFramework

Directive,theterm‘Sewer’wasredefinedtoincludeSUDS.Throughthis,Scottish

Waterwasmaderesponsibleforthefuturemaintenanceandcapitalreplacement

ofsharedpublicSUDSschemes.Thesechangeswerebroughtinthroughthe

enactmentofstage3oftheWaterEnvironmentandWaterServices(Scotland)

Act2003.ScottishWaterwillnowvest(adopt)detentionponds,basinsand

undergroundstoragestructuresdesignedtoattenuatesurfacewaterrunoff.

Sewers for Scotland 2nd Edition, 2007nowprovidesguidanceonthedesign,

operation,maintenanceetcofsustainabledrainagesystems.The Scottish Building

Standards, section 3: Surface water drainagealsocontainsspecificadvice.

CIRIA publications

The SUDS Manual 2007.CIRIA C697

Thisguidanceprovidesbest

practiceadviceontheplanning,

design,construction,operationand

maintenanceofSustainableDrainage

Systems(SUDS)tofacilitatetheir

effectiveimplementationwithin

developments.

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

Areportwhichdetailsthe

appropriateapproachtothe

successfuldesignandconstruction

ofSustainableDrainageSystems.

Structural design of modular geocellular drainage tanks 2008. CIRIA C680

Co-sponsoredbyMarley,thisreport

focusesspecificallyonthedifferent

typesofundergroundgeocelluar

modularunits.Itprovidesguidanceon

testmethods,structuraldesignandthe

practicalissuesthatshouldbeconsidered

inthedesignphaseofaproject.

Further reference

communities.gov.uk

defra.gov.uk

ciria.org

Further reference

wrcplc.co.uk(SewersforScotland,2ndedition)

sepa.org.uk(ScottishEnvironmentProtectionAgency)

sbsa.gov.uk(ScottishBuildingStandardsAgency)

scottishwater.co.uk

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Applications


Waterloc250cells

110mm/160mminletpipeconnections

Riser(cuttosuit)

PermeableGeotextilefleece

Optionalinlet/inspectionchamber

Lid&frame

Sideinlet110mm-300mmconnections

Baseperimetercellclip

Toplayercellconnector

Infiltration

Infiltrationsystemsaredesignedtoprovidetemporarystorage

ofsurfacewaterrunoffwhilenaturaldispersionintothe

surroundingsoiltakesplace.Conventionalsoakawaysare

themostcommonexampleofbelowgroundinfiltration.

ThehighvoidareaofWaterloc250(96%)meansthatathird

ofthevolumeisrequiredcomparedwithaconventional

gravel/shinglefilledsoakaway.Thesuccessofanyinfiltration

installationiswhollydependentonthepermeabilityofthe

surroundingsoil.Waterloc250cellsrequireageotextile

wrappinginaccordancewiththespecificationinappendix

one,(page28)Figure1showsatypicalinfiltrationsoakaway.

Pipeconnectionscanbemadetothetankusingsideinlet

connectorsorviatheuniqueMarleyinletchamberwhen

incorporatedinthedesign.Theinletchamberadditionally

providesaccesstothetankforinspectionandcleaning.Inlet

chamberscanbeusedpurelyasaccessforinspection.Multiple

chambersmaybeappropriateforlargerschemes.

Fig 1


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

PermeableGeotextilefleece

Pipeconnector

Impermeablemembrane

110mm/160mminletpipe

Waterloc250cells

110mm/160mmoutletpipe

Silttrapwithinletfilter

FlowcontrolchamberfittedwithFlowlocvortexcontrolunitororificeplateassembly

Fig 2

Toplayercellconnector

Attenuation

Designedtostorestormwatertemporarilyinasuitable

chamberbelowgroundandreleaseitatapre-determined

rateviaavortexflowcontrolunit,suchastheMarley

Flowlocoranorificeplate.Thislimitsthepeakflowofwater,

therebyreducingthelikelihoodofoverloadingpipelinesor

watercoursesdownstream.Thesizingoftheattenuationtank

iscritical,toallowsufficientcapacitytopreventupstream

flooding.TheMarleyTechnicalServicesteamofferadesign

servicetoassistwiththiscalculation.Attenuationtanksmust

beencapsulatedwithinanimpermeablemembraneand

geotextileinaccordancewiththespecificationinappendix

one,(page28).Increasingly,assewernetworksapproach

capacity,attenuationtechniquescanofferacosteffective

solutionforaccommodatingadditionalcatchmentareas

withoutincreasingthesizeofthesewer.

14

Hydraulic design


Rainfall intensity and duration

Thelevelofrainfalladrainagesystemmustcopewithvarieswiththestorm

duration,thereturnperiodofthestorm,andthegeographicallocation.

Storm durationRainfallintensityvariesinverselywiththedurationoftherainfall,i.e.theshorterthe

durationthemoreintensetherainwillbe.Forconventionalundergrounddrainageit

iscommontoassumea3–5minutetimeofentrytothedrainagenetwork,andthen

addtothisthetimeofflowtoobtaintheduration.Whentheoutflowisrestricted,

eitherbyacontroldevice,orbytherequirementforinfiltrationtotakeplace,the

criticaldurationincreases.Itisthereforeimportantwithanystorageorinfiltration

designtodeterminethecriticalduration.

Return periodTheintensityofastormisnotonlygovernedbyitsduration,butalsohowfrequently

itcouldbeexpectedtooccur.Statisticallyastormthatoccurseveryweekwillbe

significantlylowerinintensitythanastormwhichwillonlyoccuronceevery100

years.Itisnotpossibletoguaranteethatasystemwillnotbeoverwhelmed,butby

selectingalongerstormreturnperiod,thedesignercanreducetheriskfactor,(there

isa3650to1chanceofa10yeareventhappeningtomorrow,buta36,500to1

chanceofa100yeareventhappening).Guidanceisavailablefromstatutorybodies

withregardtoreturnperiods.Table1givessomeoftherangeofvalues:

Source Applicableto Returnperiod(yrs)

PartH,BuildingRegulations1 Infiltration 10

BSEN752–4:20082 Infiltration & Attenuation 30

Sewersforadoption63 Attenuation 30

Environmentagency Infiltration & Attenuation 100

Environmentagency‡ Infiltration & Attenuation 100+20%

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

LocationThelocationofthesitecanhaveasignificantinfluenceonthelevelofrainfall

intensity.GenerallythewesternsideoftheUKexperienceshigherlevelsoflonger

durationrainfall.Thedesignguidanceusedbymostdesignerstoascertainrainfall

intensityistheWallingfordProcedure4,whichgivesmethodsfordeterminingthe

rainfallintensityinanygivenlocationbasedonreturnperiod,durationandlocation.

Themethodgivenisfairlycomplex,andacomputerisedsolutionisgenerallyused.

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 Table1


15

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

Waterloc250canbedesignedforuseineitherinfiltrationorattenuation

applications.Thedesignmethodswillhoweverdifferforeachapplication.

InfiltrationInfiltrationistheprocessoftemporarilystoringwaterandallowingittoslowlydisperse

intothegroundandcanbedesignedusingoneoftwomethods:

BRE3655isthetraditionalmethodforsoakawaydesign,andusesonlythesidesofthe

soakawayfordesignpurposes,assumingthatthebasewillsiltupoveraperiodoftime.The

calculationmethodsarefairlysimple,butthelackofconsiderationofthebaseleadstolong

thintrenchsoakawaysasthemostefficientconfigurationforthismethod.

CIRIA1566isamoremodernmethod,whichallowsthebaseaswellasthesidestobe

usedforinfiltration.Tocountertheeffectsofsiltation,safetyfactorscanbeintroduced,

dependingontheriskoffailure.TheCIRIAdesignmethodleadstoshallow,flat

soakaways,whichareusuallybettersuitedtoWaterloc250installations.

AttenuationAttenuationistheprocessofretainingwateronsite,beforegraduallyreleasingitinto

asewerorwatercourseatacontrolledflowrate.

Therequiredstoragevolumeforanattenuationsystemcanbedeterminedusingthe

followingequation:

Itisrecommendedthatthiscalculationmustberepeatedatanumberoftimesteps

between5minutesand48hourstodeterminethecriticalduration,i.e.theduration

whichgivesthegreatestrequirementforstorage.Thesmallerthetimestep,themore

accuratelythismaximumvaluewillbedetermined.

Thelevelofallowabledischargefromthesitewillvarydependingonwherethesiteisand

whatitsprevioususewas,(brownorgreenfield).Mostauthoritieswillnotwanttoaccept

thefullrunoff.TheEnvironmentAgencywilloftenaskfordischargetobereducedto

5litrespersecondperhectare(10,000m2)ina100yeareventforanex-greenfieldsite.

Thiswouldonlyequatetoapproximately2%oftheunrestricteddischargefromthe

site,andsocouldrequireconsiderablestorage.Forbrownfieldsites,thedesignermust

provehowmuchwaterpreviouslydischargedfromthesite,andthendiscusswiththe

EnvironmentAgencyorWaterAuthoritytoagreeanacceptabledischarge.Theacceptable

dischargeisoftenlessthanthepeakflowfromsitebeforere-development.

Whicheverinfiltrationdesign

methodisused,thereare

anumberofimportant

considerationsforsoakaways:

‧ Theymusthalfemptyin24

hoursorless,toensurethat

ifanothermajorstormoccurs

shortlyafterthefirst,thesystem

willbeabletocopewithit.

‧ Theymustbelocateda

minimumdistanceof5m

fromthenearestbuilding,to

protectbuildingfoundations

fromdamage.

‧ Theymustbewrappedina

geotextilefleecetoensurethat

surroundingsoildoesnot

migrateintothesoakaway

void,reducingitseffectiveness.

Seeappendixone,page28.

‧ Itisvitallyimportantthatan

accuratesoilinfiltrationrate

isestablishedbysitetesting.

Adetailedtestmethodis

providedinBRE3655.

‧ Thereshouldbeaminimum

of1mbetweenthehighest

predictedgroundwaterlevel

onthesite,andthebottom

ofthesoakaway.

Inflow(m3/min)xDuration(min)–Outflow(m3/min)xDuration(min)=StorageVolume(m3)

16


Design

Sizing calculations for infiltration & attenuation systems

Theeasiestwaytocalculatetherequiredsizeofstormwatermanagementsystems

isbyusingtailoredcomputersoftware.MarleyPlumbing&Drainagecanofferthis

serviceusingsoftwarewhichiscapableofassessingrainfallforanydurationand

returnperiodanywhereinUK.Thoseinvolvedwiththeconstructionindustrycan

takeadvantageoftheMarleystormwaterdesignservices,providedacommitment

ismadetospecifyanduseMarleyPlumbing&Drainageproducts.

Soakawaysforsmallercatchmentareas(e.g.singlehouse)canbesizedusingthe

recommendationsinBSEN752–4:2008NationalAnnexNG(Drain&sewer

systemsoutsidebuildings).Theguidancestatesthatthesoakawayshouldhave

acapacityequalto20mmofrainfallovertheareabeingdrained.Thismethod

assumesthatthelocalsoilconditionsofferlowpermeabilityandtherefore

stormwaterwillneedtobestoredinthesoakawayfollowinghighintensitystorms.

ThetablebelowshowstheeffectiveheightincrementsoftheWaterloc250cellforusewhencalculatingstoragevolume.

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 checklistForaccuratesizingofinfiltrationand

attenuationsystemsitisvitalthat

sitespecificinputdataisprovidedto

enabletherelevantcalculationsto

bemade.Thefollowinginformation

isrequiredforsizingasoakawayor

attenuationsystem:

1. Thecalculationmethodtobe

used(BREorCIRIA)

2. Thegeographicallocationof

thesite(forselectionoflocal

rainfallstatistics)

3. Thestormprofilestobeused

(returnperiodinyears)

4. Thecatchmentareas

dischargingintothe

stormwatersystem(roofsand

otherhardsurfacedareas)

5. Soilinfiltrationrate(derived

fromporositytestsconducted

onthesite)

6. Allowableoutflowrate,

litres/second(forattenuation

systems)

7. SafetyFactortobeapplied

whichisnormallyagreed

withtheLocalAuthority,

EnvironmentAgencyorWater

Company(dependenton

consequenceofflooding)


17

D e s i g n

Air venting

Aventpipemayberequiredonsomeinstallationsdependingontheconfiguration(seeexamplesonpage24-27).

VentingpipeworkcanbeconstructedusingstandardcomponentsfromtheMarleyundergroundandsoilranges.

Systemswithasingle110mminletdonotgenerallyrequireventing.Forinstallationsupto60m3,a110mmventisadequate.

UG61Filter

USW30600mmSilttrap

UG60250mmSilttrap

USW29Filter

Flow control

ThebenefitofusingtheMarleyFlowlocvortexflowcontrol

unitisthatthedischargeratevarieslesswithchangesinthe

headofwaterinthetank.Orificeplatesoperatebyreducing

theflowareatoamuchsmallerproportionofitsoriginal

size,therebyconstrictingtheflowrate.Seeappendixtwofor

performancetables,page29.

Filtration

Centraltothefunctionofanyinfiltrationorattenuation

storagesystemistheprotectionofthecellsandflowcontrol

componentsfromtheingressofdebrisandsilts.

Forasmallerinstallation,a250mmsilttrap,UG60canbe

installedupstreamofthestoragesystem.Forimproved

protection,theUG61filtercanbeadded,whichwillretain

debrisassmallas5mm.

Largerschemesbenefitfroma600mmsilttrap,USW30,which

canbeusedwithorwithouttheUSW29filterwhichwillretain

debrisparticlesassmallas10mm.

18

Structural design

Light duty applicationsLandscaped(Nontraffickedareas)

Structural design considerations

Thephilosophyoflimitstatedesignisusedforstorage

tanks,whichshouldbedesignedtosafelysupportthe

imposedloads,butallowingforthepropertiesofplastic.

Theconceptoflimitstatedesignistoconsiderthe

probabilitydistributionsofallparameters(appliedloads

andmaterialstrengthandstiffness)toprovidebetter

controloverriskthantraditionaldesignmethods.

Thetwomostcommonlimitstatestobeconsideredare:

1.Ultimatelimitstate-thestructureshouldnotbecome

unstableorcollapseunderworkingloadsor

foreseeableoverload.

2.Serviceabilitylimitstateofdeflection-deflections

oftheunitsandthesurroundinggroundshouldbe

atacceptablelevels(forexampletopreventsurface

deformation).

FurtheradvicecanbefoundinCIRIAdocumentC680,

Structuraldesignofmodulargeocellulardrainagetanks.

SWilson:2008.

Waterloc250hasbeenextensivelytestedtoverifythe

followingstructuralperformancefigures.

SitetopographyWhereinstallationsarelocatedadjacenttothefootofanembankmentorslope,considerationmustbegiventotheincreasedlateralloadingthatwillbeexertedonthecellsandthemaximumdepthmayneedtobeadjustedasappropriate.GuidanceonthiscanbefoundintheCIRIAguideC680.

ConstructionplantAminimumof300mmcovermustbeappliedbeforemechanicalcompactioncantakeplace.Abnormalconstructiontrafficmustbepreventedfromcrossingthetankandinparticularcranesandothersimilarplantshouldnotbelocatedoverthetankunlessaspecificsiteassessmenthasbeenundertaken.Oncesurfacingiscomplete,heavyconstructiontrafficshouldbepreventedfrompassingovertheinstallationunlessthedesignspecificallyallowsforthis.

Property Verticalloading Lateralloading ontopface onsideface

Shorttermcharacteristiccompressivestrength 350kN/m2 82kN/m2

Shorttermloadtocause1mmdeflection 47kN/m2 7kN/m2

Structural performance figuresForinfiltrationapplicationsthebaselevelofthegeo-cellularunitsmustbeatleastonemetreabovethemaximumwatertablelevel.Forattenuationsystemsitisrecommendedthatgeo-cellularunitsarenotinstalledbelowthemaximumwatertableleveltoavoidtheriskoffloatation.


19

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

Medium duty applicationsCarparksandareaslimitedtovehiclesof9000kgG.V.W

Heavy duty applicationsHGV’supto44,000kgG.V.W(Slowmovingtrafficonly)

(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)

Maximuminstallationdepths(tobaseofcells)andminimumcoverdepthsofWaterloc250cells

Installation depths and cover

20

Installation data


Fig 1

Fig 2 Fig 3

Fig 4

Waterloc250

ThebaseorfirstlayerofWaterloc250cellsinanyinstallationmustfirsthavethebaseplatefixedtothebaseofthecell.BecauseeachWaterloc250cellinterlocksvertically,cellsonsubsequentlayersdonotrequireabaseplate.Thecellshouldbeinvertedandthebaseplatepushedintoplace(fig1),makingsurethealignmentarrowsonthecellandthebaseplatearereversed.Thebaseplatehasfourclipsthatlocateintotheinternalpillarsofthecell.

Thebaselayerofcellsarepositionedonthepreparedsharpsandbedoncethegeotextileorimpermeablemembrane(dependingontheapplication)hasbeenlaid.Thecellsshouldbepositionedsothatthealignmentarrowspointinthesamedirection.Celledgesshouldbutttogetherandintersectingcornersalign.Theperimeterofadjacentcellsshouldthenbesecuredusingthebasecellclip(figs2&3).

Furtherlayersofcellsarebuiltupbyrotatingthecellsby180°sothatthealignmentarrowsonsuccessivelayersalternate.Nofurtherclipsarerequiredoninterveninglayersasthecellsinterlockvertically.

Thewholeconstructionshouldbesecuredbyfittingthetopcellconnectoraroundtheedgesofthecellsandatallintersectingpoints(fig4).


21

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

Silicone seal flange &plate to geomembrane

Side connectionplate

Geomembrane

WLRE250L & M sideconnection plateto suit 225 & 300mmQuantum pipe sizes

Invert

Geomembrane clampplate

D

Fig 5 Fig 7Fig 6 Fig 8

Pipe connections

Marleyofferanumberofoptionsforinletandoutletpipeconnections,from110mmto300mm.TheWLRE250canbeusedfor110mmand160mmsolidwallpipeor150mmstructuredwallQuantumpipe.TheWLRE250LorMcanbeusedfor225mmand300mmstructuredwallQuantumpipe.

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

225mm & 300mm connectors, WLRE250L WLRE250M

Tofittheconnector,locatethetwomountingplatelegsintotherimofthecellandpositiontheupperlugssothattheyalignwiththeverticalslotsofthecell.Guidethelugsintotheslotsandsnapintoposition.

Pulltheimpermeablemembraneand/orgeotextiletautoverthespigotofthemountingplateandusethespigotasacuttingguidetomakeaclosefittingholeinthematerial.

Forattenuationtanks,theimpermeablemembraneshouldbesealedbyapplyingadoublebeadofsiliconesealanttothefaceofthemountingplateandbetweenthemembraneandtheflangeofthespigot.Ifusing160mmor150mmpipes,removethe110mmspigotsection.

Pullthematerialtighttothemountingplateandfittheconnectorsothatthekeywayrecessalignswiththekeyontheplate.Thenfitthescrewsthroughthematerialsothattheysecurelyclampthespigottothemountingplate.Thespigotorientationcanbereversedtosuitinletoroutletconnections.

Theseconnectorsarefittedinasimilarmanner,exceptthatthemountingplatesspantheheightoftwocells,fixingintothetopoftheuppercellandthebaserimofthelowercell.

Type Quantum D (mm) Pipe Size

WLRE250L 225 290

WLRE250M 300 370

22

Installation data


Clarkdrainorsimilar750mmsqinspectioncover&framesetonconcreteslabandbrickwork.

Flowcontrollerwithdrawalhandle

Polythenemembranebondbreaker

OVERFLOWLEVEL

Ø50mmOverflowpipe

Ø110/160mmrockerpipe

Ø110/160mminlet

Ø600mmriserkitincludingclampsandseal.(USW301,USW32&USW33)

Riserclamps

150mmmingranularsurround

Filterwithdrawalchain

600mm

Flowlocvortexflowcontrollersizetosuitrequireddischargerate

150mmconcretebed&surround

Flowlocchamber

Inletfilterbox

600mm silt trap and Flowloc chamber base

TheUSW30canbeusedasa600mmsilttrap,withorwithouttheUSW29filter.ItisalsousedasthehousingfortherangeofFlowlocvortexunitsandorificeplateflowcontrolunits.

Thechamberbasecanbeinstalledwithinaprecastconcretemanholeorwithariserpiece(availableaspartoftheWaterlocrange.)Bothinstallationmethodsrequirethebasetobelevelandbeddedintoa150mmconcretebaseandsurround.Thebasehasspigotconnectionssuitableforeither110mmor150mmpipesizesattheinletandoutlet,withadditional110mmsideconnectionsforusein‘off-line’installations.Allpipeconnectionsshouldbefittedwith600mmlongrockerpipestoallowforgroundmovement.

Filter

Attachtheendofthefilterchaintotheinsideoftheriserwiththe‘P’clipandscrewprovided,thenlowerthefilterintothebasesothatitlocatesagainsttheinlet.

Flowloc vortex flow control unit

Usingthesolventcementsuppliedwiththekit,bondthe20mmpipesockettothelengthof20mmpipe,thenbondthesockettothehandleattachmentontheFlowlocdevice.Allowthesolventtosetbeforeloweringthecontrollerintothebaseandengagingthesquareflangeintothecouplingslot.Thehandlecanbecuttolength.

Tosettheoverflowlevel,fitthe50mmpipeintothesocketinthechamberbasealuminiumcouplingandmarkthepipeatapointcoincidingwiththetop,orjustbelowthetopofthestoragetank.Cutthepipeatthispointandbondintothesocketwithsolventcement,thensecuretheopenendtotheinsideoftheriserwallwiththepipeclipandscrewsprovided.

Chamber Riser

Tofitthe600mmrisertothechamberbase,fittheinletringsealintothefirstcorrugationoftheriser,lubricatethesealwithsiliconegreaseandinsertfullyintothesocketofthebasewithfirmpressure.Fittheclampringbetweenthegroovesofthebasesocketandlocatethefourclampsinthecorrugationsoftheriserbeforetightening.

Priortobackfillingwithgranularmaterial,leaktestthesealbycappingtheinletandoutletconnectionsandfillingtheriserwithwatertoapproximately0.5mabovetheseal.

Therisershouldbecutbacktowithinapproximately200mmoffinishedgroundlevelbeforecastingaconcretecollarwithabondbreakermembranearoundtherisertopreventloadtransfertotheshaft.Acastironinspectioncoverandframewithaminimumclearopeningof750mmcanthenbesetonengineeringbrickworktocompletetheinstallation.


23

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

250mm silt trap, UG60

The250mmsilttrap,UG60canbeusedwithorwithoutafilter,UG61.The250mmsilttrapmustbeinstalledwiththeflowindicationarrowinthebaseoftheunitinlinewiththedirectionofflow.Thiswillensurethatthefilterisalwayscorrectlylocatedagainsttheinletconnection,andthattheleafguardisfittedtotheoutlet.

Thesilttrapshouldbeinstalledwithapeashinglebedandsurroundattheappropriatedepth.Theriseristhentrimmedbacktosuitthegroundlevel,beforetheUCL2/3coverandframeisbondedinplacewithsolventcement.WheninsertingthefilterintotheUG60,makesurethatthebaseispositionedagainstthelocationrampsandthatthewireretainerisloweredtolockitintoposition.

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

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

2 5 8 11 14 17 20 23 26 29 32 35 38 41 44 47 50 53 56 59

3 12 16 20 24 28 32 36 40 44 48 52 56 60 64 68 72 76 80

4 21 26 31 36 41 46 51 56 61 66 71 76 81 86 91 96 101

5 32 38 44 50 56 62 68 74 80 86 92 98 104 110 116 122

6 45 52 59 66 73 80 87 94 101 108 115 122 129 136 143

7 60 68 76 84 92 100 108 116 124 132 140 148 156 164

8 77 86 95 104 113 122 131 140 149 158 167 176 185

9 96 106 116 126 136 146 156 166 176 186 196 206

10 117 128 139 150 161 172 183 194 205 216 227

11 140 152 164 176 188 200 212 224 236 248

12 165 178 191 204 217 230 243 256 269

13 192 206 220 234 248 262 276 290

14 221 236 251 266 281 296 311

15 252 268 284 300 316 332

How many cell connectors are needed for an installation?

Theabovetableindicatesthemaximumnumberoftopcellconnectorsrequiredforaninstallation.Theconnectorsarerequiredateachintersection,butforthetoplayeronly.Thiswillalsoensurethatasufficientnumberofbasecellconnectors(centrepop-outoftheconnector)areavailablefortheinstallation.

No.

of

cells

–w

idth

No.ofcells–length

24

Typical installation details

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

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 or UCL35PP)

Riser section (UCR2)

Multi spigot side connector (WLRE250)

Soakaway with 250mm silt trap and filter

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)

600mmmax

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


25

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

Attenuation tank with inlet filter and Flowloc vortex flow control unit

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


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

Flowloc vortex flow controller size to suit required discharge rate

Controlled release to drainage system


Ø110/160mm rocker pipe

Ø50mm Overflow pipe

OVERFLOW LEVEL

Flow controller withdrawal handle


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

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

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)

Soakaway tank – volume & configuration as noted

Adaptor tray (UMF22)

Inlet chamber (UMF21)

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

Riser section(UCR2)

Riser clamps

26

Typical installation details

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


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

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)

150mm concrete bed & surround

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


27

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

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

Seemarley.co.ukforthecompleterangeoffullydetailedCADdrawings.

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


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)

600mm

Riser clamps

28

Appendix One

Property Typical value Test method

Fabric 100%PES1100dtex

Weight 1100g/m2 DINEN2286-21998

Breakingstrength Warp 4000N/5cm ENISO14211998 Weft 3500N/5cm

Tearstrength Warp 600N DIN533632003 Weft 500N

Adhesion 125N/5cm ENISO24112000

Waterproofness >200kPa NFG371061986

Temperatureresistance -30deg.Cto+70deg.C DINEN1876-21998

Lightfastness 7-8 ISO105B021988

Firebehaviour <100mm/minute ISO37951989

Nylon reinforced PVC

Impermeable membrane specification

Property Typical value Test method

Weight 250g/m2 EN965

Thickness 2.3mm EN964-12kPa

CBRpunctureresistance 3000N ENISO12236

Tensilestrength md16.6kN/m ENISO10319(averagevalues) xd18.3kN/m

Elongation md50% ENISO10319 xd55%

Conedroptest 13Mm EN918

Poresize 90um ENISO12956

Waterflowrate 85l/m2.s ENISO11058

Permeable geotextile specification

Maintenance Appendices

Infiltration and attenuation tanks using Waterloc250

Whereprovisionhasbeenmadeforinspectionofthetank,itshouldbeperiodicallycheckedforbuildupofsiltsinthebase.Ifthereisevidencethatsiltsorlargerdebrisparticleshavesettledinthetank,itshouldbepartiallyfilledwithcleanwaterwhichwillloosenthelightermaterialandbringitintosuspensionbeforedrawingthewateroutwithasuitablesumppump.Highpressurejettinghosesshouldnotbeusedtocarryoutcleaningasthesemightdamagethetankliner.


Ideally,amaintenanceprogrammeshouldbesetuptoensurethattheFlowloccontrolsystemisregularlycheckedandcleaned.Thefilterunitshouldbeperiodicallyraisedtoensurethatcollecteddebrisdoesnotobstructtheinlettothechamberbase.Anydebriscanberemovedviatheinletportatthebackofthefilterbox.Beforereplacingthefilteritisadvisabletocleanoutthebaseofthechamberwithasuctionpumptoensurethatthefilterseatscorrectlyonreplacement.TheFlowloccontrollerororificeplateshouldbeperiodicallyremovedforinspectionandcleaning,andthebasecouplinghosedouttoensurecorrectseatingonreplacement.

250mm silt trap

UG60trapsshouldberegularlymaintainedbyremovingtheleafguardfromtheoutletanddiscardinganydebrisfromthebaseofthetrap.TocleantheUG61filter,raisethewireretaineronthefilter,tiltforwardandpulloutbythehandle.Removethelidbypressingthereleasecatchandthoroughlycleantheunitwithahose.Removeanycollectedsiltfromthebaseofthetrap,replacethefilterandlockintoplacebyloweringthewireretainer.


29

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)

30

Product information

A

DCB

A

C

D

B

A

C

B

C

B

A

CA

B

For use with WLRB250 on bottom layer only

Description Code

110mm/160mm inlet/outlet pipe connector WLRE250 Size mm A B C D Colour110/160 265 250 190 45 Grey

225mm Quantum inlet pipe connector WLRE250L300mm Quantum inlet pipe connector WLRE250M Size mm A B C D Colour225 551 415 306 245 Stainless/orange 300 551 415 386 165 Stainless/orange

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

Cell connector WLRC250

Size mm A B C Colour 235 235 35 Sand


31

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

Effective height

B

A

C

A B

C

D

B

A

C

C

B

A

Description Code

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

Adaptor tray UMF22A

Size mm A B C Colour 1385 984 100 Black

Chamber riser UCR2 Size mm A Colour450 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 Colour450 UCL35PP 547 494 70 Black 450 UCL35 517 490 40 Black

Silt trap UG60

Size mm A B C Colour250 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

32

Product information

1085

612

815

380 57

5

325

300

240

A

A

B

B

A

C

A

B

C

B

A

B

A

For use with UG60 silt trap

Description Code

250mm Inspection cover and frame – circular UCL2250mm Inspection cover and frame – square UCL3

Size mm A B C Colour250 UCL2 280 70 – Black 250 UCL3 318 78 20 Black

Silt trap USW30

Size mm Colour 600 diameter Black

Inlet filter USW29 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 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 * Shown

Non return valve USW120 Size mm Code A B Colour110 USW120 307 230 Orange


33

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 50mm overflow pipe.

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 50mm overflow pipe.

TheAliaxisgroupofcompaniesoffersolutionsfordealingwithwaterinasustainableway.

www.sustainablewatersolutions.com UK

AttenuationtankforRobertsonHomes,SeaforthRoad,Ayr

Head OfficeLenham, Maidstone Kent ME17 2DE Tel: 01622 858888 Fax: 01622 858725

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

June 2011

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

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