AFOURER - MAROC - Geosynthetica

AFOURER - MAROC
Nicolas de Walque

STEP AFOURER
Water-Basin’s
Water Basin’s Characteristics
Zone implantation
In Morocco, close of Beni-Melal Beni Melal (Moyen Moyen
Atlas), between Marrakech et Mekhnès. Mekhnès
High delta T° during the day
Summer - 48°C Winter -10°C 10°C
Winds of 130 Km/h
Station of Transfer of Energy by Pumping
(STEP)
Emptying of the upper water-basin water basin through
power turbines in order to cover the peak of
electricity need of the country. Water is
stored in the lower water-basin.
water basin.
Filling up of the upper water-basin water basin by electric
pumping of the water stored in the lower
water-basin, water basin, during the night : when there is
an overcapacity of electricity coming from
thermal power station.

STEP AFOURER
Water-Basin’s
Water Basin’s Characteristics
Upper water-basin
water basin
Altitude : 1 280 m
Max. water level : 12,72 m
Support : old calcareous rocks
(karstique karstique) ) with ponors and
lapiazes. lapiazes
Slope : 3H/1V - Dam : 5H/1V
Area : +- + 200 000 m²

STEP AFOURER
Water-Basin’s
Water Basin’s Characteristics
Lower water-basin
water basin
Altitude : 480 m
Max. water level : 13,22 m
Support : clayey and chalky soil
Slope : 3H/1V - Dam : 5H/1V
Area : +- + 200 000 m²

STEP AFOURER
Waterproofing system on the slopes
0,50 m
0,20 m
0,20 m
Enrochement 100/200
Grave concassée ou roulée 5/16
Geomembrane ALKORPLAN 35053
Grave concassée ou roulée 5/16
Soil
Geotextile PP 500gr/m²
Geotextile PP 500gr/m²

STEP AFOURER
Stratification of the protective lays on the slope

STEP AFOURER
Waterproofing system on the ground
0,30 m
0,20 m
Grave concassée ou roulée 5/16
Geomembrane ALKORPLAN 35053
Grave concassée ou roulée 5/16
Soil
Geotextile PP 500gr/m²
Geotextile PP 500gr/m²

STEP AFOURER
Installation : test of the system

STEP AFOURER
Installation : test of the system

STEP AFOURER
Installation : lay for the support and the drainage

STEP AFOURER
Installation : anchor

STEP AFOURER
Installation : waterproofing complex (1)

STEP AFOURER
Installation : waterproofing complex (2)

STEP AFOURER
Installation : quality control

STEP AFOURER
Installation : geotextile

STEP AFOURER
Installation : first lay of protection (ground)

STEP AFOURER
Installation : first lay of
protection (slope)

STEP AFOURER
Installation : first lay of protection (slope))
(slope)

STEP AFOURER
Installation : second lay of
protection

STEP AFOURER
Installation : connection to concrete

STEP AFOURER
Upper Basin
Installed by VALMONT (Morroco ( Morroco)

STEP AFOURER
Lower basin
Done by SOFIMA
ENVIRONNEMENT (Morroco ( Morroco)

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