AFOURER AFOURER -- MAROCMAROC

Nicolas de Walque

STEP AFOURERSTEP AFOURERWaterWater--Basin’sBasin’s CharacteristicsCharacteristicsZone implantationZone implantation

In Morocco, close of In Morocco, close of BeniBeni--MelalMelal ((MoyenMoyenAtlas), between Marrakech et Atlas), between Marrakech et MekhnèsMekhnès..High delta T° during the dayHigh delta T° during the daySummer Summer -- 48°C Winter 48°C Winter --10°C10°CWinds of 130 Km/hWinds of 130 Km/h

Station of Transfer of Energy by Pumping Station of Transfer of Energy by Pumping (STEP)(STEP)

Emptying of the upper waterEmptying of the upper water--basin through basin through power turbines in order to cover the peak of power turbines in order to cover the peak of electricity need of the country. Water is electricity need of the country. Water is stored in the lower waterstored in the lower water--basin.basin.Filling up of the upper waterFilling up of the upper water--basin by electric basin by electric pumping of the water stored in the lower pumping of the water stored in the lower waterwater--basin, during the night : when there is basin, during the night : when there is an overcapacity of electricity coming from an overcapacity of electricity coming from thermal power station.thermal power station.

STEP AFOURERSTEP AFOURERWaterWater--Basin’sBasin’s CharacteristicsCharacteristics

Upper waterUpper water--basinbasinAltitude : 1 280 mAltitude : 1 280 mMax. water level : 12,72 mMax. water level : 12,72 mSupport : old calcareous rocks Support : old calcareous rocks ((karstiquekarstique) with ) with ponorsponors and and lapiazeslapiazes..Slope : 3H/1V Slope : 3H/1V -- Dam : 5H/1VDam : 5H/1VArea : +Area : +-- 200 000 m²200 000 m²

STEP AFOURERSTEP AFOURERWaterWater--Basin’sBasin’s CharacteristicsCharacteristics

Lower waterLower water--basinbasinAltitude : 480 mAltitude : 480 mMax. water level : 13,22 mMax. water level : 13,22 mSupport : clayey and chalky soilSupport : clayey and chalky soilSlope : 3H/1V Slope : 3H/1V -- Dam : 5H/1VDam : 5H/1VArea : +Area : +-- 200 000 m²200 000 m²

STEP AFOURERSTEP AFOURERWaterproofing system on the slopesWaterproofing system on the slopes

Grave concassée ou roulée 5/16

Grave concassée ou roulée 5/16

Enrochement 100/200

Geotextile PP 500gr/m²

Geomembrane ALKORPLAN 35053

Soil

0,50 m

0,20 m

0,20 m

Geotextile PP 500gr/m²

STEP AFOURERSTEP AFOURERStratification of the protective lays on the slopeStratification of the protective lays on the slope

STEP AFOURERSTEP AFOURERWaterproofing system on the groundWaterproofing system on the ground

Grave concassée ou roulée 5/16

Grave concassée ou roulée 5/16

Geotextile PP 500gr/m²

Geomembrane ALKORPLAN 35053

Soil

0,30 m

0,20 m

Geotextile PP 500gr/m²

STEP AFOURERSTEP AFOURERInstallation : test of the systemInstallation : test of the system

STEP AFOURERSTEP AFOURERInstallation : Installation : test of the systemtest of the system

STEP AFOURERSTEP AFOURERInstallation : lay for the support and the drainageInstallation : lay for the support and the drainage

STEP AFOURERSTEP AFOURERInstallation : anchorInstallation : anchor

STEP AFOURERSTEP AFOURERInstallation : waterproofing complex (1)Installation : waterproofing complex (1)

STEP AFOURERSTEP AFOURERInstallation : Installation : waterproofing complex waterproofing complex (2)(2)

STEP AFOURERSTEP AFOURERInstallation : quality controlInstallation : quality control

STEP AFOURERSTEP AFOURERInstallation : geotextileInstallation : geotextile

STEP AFOURERSTEP AFOURERInstallation : first lay of protection (ground)Installation : first lay of protection (ground)

STEP AFOURERSTEP AFOURERInstallation : Installation : first lay of first lay of protection (slope)protection (slope)

STEP AFOURERSTEP AFOURERInstallation : Installation : first lay of protection (slope)first lay of protection (slope)))

STEP AFOURERSTEP AFOURERInstallation : second lay of Installation : second lay of protectionprotection

STEP AFOURERSTEP AFOURERInstallation : connection to concreteInstallation : connection to concrete

STEP AFOURERSTEP AFOURERUpper BasinUpper Basin

Installed by VALMONT (Installed by VALMONT (MorrocoMorroco))

STEP AFOURERSTEP AFOURERLower basinLower basin

Done by SOFIMA Done by SOFIMA ENVIRONNEMENT (ENVIRONNEMENT (MorrocoMorroco))

STEP AFOURERSTEP AFOURERWhyWhy ALKORALKOR

Original prescription done by EDF with PVC geomembrane and bentoOriginal prescription done by EDF with PVC geomembrane and bentonite nite –– or or equivalent ;equivalent ;Calcareous support with risk of collapse Calcareous support with risk of collapse –– high elastic deformation required ;high elastic deformation required ;Demand of high puncturing resistance for the installation of theDemand of high puncturing resistance for the installation of the protective protective layers ;layers ;Elimination of HDPE,Elimination of HDPE,Elimination of TPO,Elimination of TPO,thanks to high performances of PVC geomembrane ALKORPLAN thanks to high performances of PVC geomembrane ALKORPLAN (deformations tests CEMAGREF) ;(deformations tests CEMAGREF) ;Offer installation and materials by ALKOR DRAKA of the full systOffer installation and materials by ALKOR DRAKA of the full system with em with quality plan.quality plan.Installation subcontracted to two Moroccan Companies, under the Installation subcontracted to two Moroccan Companies, under the control of control of ALKOR DRAKA ;ALKOR DRAKA ;Technical assistance done by ALKOR DRAKA engineer : Daniel FayouTechnical assistance done by ALKOR DRAKA engineer : Daniel Fayoux and x and Martin van de Martin van de GraaffGraaff ;;Help to the conception of the systems done by ALKOR DRAKA via DaHelp to the conception of the systems done by ALKOR DRAKA via Daniel niel Fayoux ;Fayoux ;Supply of materials certified ASQUAL.Supply of materials certified ASQUAL.