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Flatbed(Leach(Drain!!!!!!!!!!
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!Flatbed(Leach(Drain!!
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Index:!!!
1. WA!Health!Department!Approval!for!DS!Flatbed!Plastic!Leach!Drains!!
2. Australian!Standards!AS/NZS1547:2012!Preferred!Characteristics!!
a)# Effluent#Loading#
b)# Design#Area#Sizing#!
3. Site!Photos!!!
Flat%Bed%ETA/ETS%Installation%Manual%
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Application%
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Component%List%DS!Water!50!mm!cell! ! ! ! ! 4!pieces!per!1.2!square!metre!(Appendix!A)!
DS!geotextile! ! ! ! ! ! non?woven!in!packs!(11.0m!x!3.0m)!
DS!Water!perforated!pipe! ! ! ! 100mm!x!50mm!x!3000!mm!(Appendix!B)!
DS!Water!pipe!connector! ! ! ! 1!per!length!
DS!Water!pipe!end!cap! ! ! ! ! 1!per!length!
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Excavation*We#recommend#that#construction#techniques#described#in#AS/NZS#1547#Clause#L7#be#observed#as#well#as#the#specific#details#that#follow.#
Ensure#that#the#level#bed#is#prepared#to#+/E#20mm#tolerance.#
Also#if#excavating#in#gravel/#clay#soils,#use#bucket#teeth#to#scarify#the#floor#to#a#min#depth#of#50mm.#
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Installation*Step*1.*Distribution*Pipe*
In#a#prepared#bed#(as#detailed#above)#lay#the#Distribution#Line#centrally#in#the#trench,#with#the#pipe#orientated#so#it#is#50mm#high.#Using#the#connectors,#join#the#3.0m#lengths,#the#required#length,#ensuring#it#finishes#a#max#of#2000#from#the#end.#NB#insert#the#gutter#plug#in#the#end#of#the#run,#or#ensure#it#is#blocked#off.#Then#fit#a#pipe#connector#to#the#start#of#the#line,#to#accept#the#incoming#feed#line.#
Step*2.*Bottom*layer*
Clipping#or#abutting#the#cells#together#to#form#a#continuous#blanket#installs#the#50mm#cell#units,#either#side#of#the#DS#Water#perforated#pipes.#The#600mm#dimension#across#the#bed,#and#the#500mm#dimension#along#the#bed#(See#Appendix#C)#NB:#LPED#lines#can#be#used#instead#of#distribution#pipes,#when#doseEloading#effluent#into#beds.#
To#ensure#that#the#50#Flatbed#blanket#is#level,#additional#friable#material#can#be#added#through#the#cells#to#their#underside,##to#areas#which#exhibit#depressions,#using#a#lift#and#drop#technique.#(See#Appendix#D)#
Step*3.*Top*layer*
Similar#to#the#Bottom#layer,#except#this#forms#a#continuous#mat#on#top#of#the#Bottom#layer#and#Distribution#pipe.#
Step*4.*Geotextile*
The#Flat#bed#is#then#covered#with#the#geotextile#supplied,#in#packs#(11.0m#x#3.0m)#or#complete#3.0m#wide#rolls.#.#The#geotextile#covers#the#top#and#the#sides.#
Step*5.*Backfilling##
The#Flat#bed#leach#drain#can#now#be#carefully#backfilled#using#the#excavated#material.#
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