Geotextiles in Embankment Dams - Association of State Dam Safety ...

Protectivecushion for ageomembraneBovilla Dam,Albania91 Nonwovenpolypropylenegeotextile800 g/m 2(24 oz./yd 2 )1996 The upstream 1.6 H:1V slope ofthe gravel fill dam was madewatertight by covering it with ageocomposite geomembrane (120mil PVC geomembrane bonded to a22 oz. nonwoven polyestergeotextile). A 24 oz. geotextilewas placed over the geocompositeand concrete slabs were cast inplace to protect the geosyntheticsfrom exposure.(Sembenelli, and others,1998)Protectivecushion anddrainage layerfor ageomembraneLa GalaubeDam, France43 Nonwovengeotextile2000 Geotextile placed as protectivelayer/drain between concrete slaband bituminous geomembranewaterproofing for a rockfill dam.The geomembrane was made byimpregnating a nonwovenpolyester geotextile with bitumen.(Gautier, and others,2002)Reinforcementfilter, anderosionprotectionMaraval Dam,France8 Wovengeotextile 750g/m 2(22 oz./yd 2 )PET1974 Geotextile placed to form avertical downstream slope of dam.(Cazzuffi, 2000), (Cassardand others, 1996)(Degoutte and Fry, 2002)SeparatorWeber Dam,Nevada, USA17 NonwovengeotextileAOS100 (10 oz/yd 2 )2007 11,000 yd 2 of geotextile placedbetween gravel drain anddownstream shell to act as aseparation layer to prevent shellfrom contaminating outer edge ofgravel drain.(F. Blackett, PersonalCommunication, 2007)