Trench ("French") Drains | Library builder

	X	s
	wrong	right
Language	Item no.
	1	2	3
English	geotextile liner	slotted drainage pipe	permeable aggregate filler
German	Geotextileinsatz	pomse Entwasserungsleitung	durchlassiger Zuschlagstoff
Spanish	capa de geotextil	tubo de drenaje ranurado	arena fina permeable
French	recouvrement de geotextile	tuyau poreux de drainage	agregat permeable
Italian	geosintetico	tubo di drenaggio poroso	aggregato permeabile
Greek	Хтроa^ Гєшпфаap^aros aa^a	XwX’qvas A-^oarpa7^ia^s \|хє Ххіа^Єs	Aia-n^parr) Хтрсоа^ ПХ^рсо aєws
Polish	warstwa geotekstylna	porowata rura drenarska	kruszywo wypetniajace dren
Portuguese	geotextil	tubo de drenagem poroso	material drenante
Serbian	geotekstil	porozna drenazna cev	drenazna ispuna
Slovenian	geotekstil	perforirana drenazna cev	drenazni zasip
Danish	geotekstil	slidset afvandingsrar	filtergrus

Language	Item no.
1	2	3	4	5
Italian	aggregato permeabile	struttura interna	geosintetico	tubo di drenaggio	tubo di drenaggio poroso
Greek	Aua^epaTiq Хтрсо	Пирій vas	2трм	SwXiq vas	SwXiq vas
	ПХ^рсо aeos		Гєоифа apaTos	A^oaTpa 77io^s	A^oaTpa77ia^s pe
			а apa		s
Polish	kruszywo wypelniajace	rdzen	warstwa	rura drenarska	porowata rura drenarska
	dren		geotekstylna
Portuguese	material drenante	estrutura interna	geotextil	tubo de drenagem	tubo de drenagem poroso
Serbian	drenaZna ispuna	jezgro (ispuna)	geotekstil	drenazna cev	porozna drenazna cev
Slovenian	drenaZni zasip	jedro	geotekstil	drenazna cev	perforirana drenazna cev
Danish	filtermateriale	kerne	geotekstil	afvandingsrar	slidset afvandingsrar

The designs of fin drains vary dependant upon the flow capacity that is required. The geosynthetic has the capacity to transport a certain flow (i. e. it has a certain transmissivity) — see diagram A, above. Where this is insufficient a pipe can be added to increase the outflow capacity, diagrams B and C. The dimension of the pipe varies depending on the additional capacity that is required.

B.5.3 Core Designs for Fin Drains

Core designs other than those shown here are also used. The purpose of the core is to support the geotextile membrane without hindering the flow of water within the thickness of the geosynthetic.

The figure, above, shows a plan view of a geocomposite highway edge drain, comprising a core (3/4/5) between two geotextile sheets (1/2). Some cores have one permeable side (e. g. geotextile layer 1) and one impermeable side (e. g. in place of geotextile layer 2) where water is to be collected from one side of the fin drain and not to be drained from the other, but these are seldom employed in highway construction except where an impermeable face (e. g. part of a retaining wall) abuts the pavement. The core may be formed in a number of ways, some of which are illustrated here: 3=plastic plates with pillars to separate faces; 4=concertina waffle structure, 5=dimpled plastic sheet. Nets/grids and stiff, entangled polymeric strands may also be used to provide a permeable core.

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Trench (“French”) Drains

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