Ahmed F. Chraibi April 2014 - Stellenbosch University
Transcript of Ahmed F. Chraibi April 2014 - Stellenbosch University
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Ahmed F. Chraibi
April 2014
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Large dams in Morocco (2013)
with 30 RCC dams (7 under construction) Morocco is ranking 5th in the world and 1st in Africa
Large dams
total Operating under
construction under design
H≥15m 176 140 21 15
H≥30m 93 68 14 11
H≥50m 54 38 11 5
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Large Dams construction
8 13 18 29
38
67
88 99
119 135
140
0
20
40
60
80
100
120
140
160
1940 1950 1960 1970 1980 1990 2000 2010 2020
Nu
mb
er
of
larg
e d
am
s
Years
110 since 1980
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Political decisions In the eighties :
Massive investment in water mobilization for irrigation and drinking water
Acquiring within 15 years dams technology
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Adopted strategy Strengthening human resources within the
government agency in charge of dams
Partnership relation with few highly experienced European consulting engineers
Contracting the design on a mutual agreement basis
Long term collaboration with local consulting
Increase of the local part with time
Attribution of small dams design to locals with external expertise
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Other
Development of RCC technology and intensive use of manpower (masonry)
Many international jobsites visits (USA, France, Japan, China, Brazil, Argentina, Russia …etc.)
Strong participation in ICOLD congresses
Invitation of high level experts
Continuing the experience only with two local companies (the most promising)
Local financing, no conditioned financing
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Hassan 1st (1986, H=145m) Plus grand remblai d’Afrique
40%
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Required specialities 1. Dam design
2. Geology / hydrogeology
3. Geotechnical
4. Structure
5. Hydrology
6. Hydraulic
7. Draughtsman
8. Hydromechanical - electromechanical
9. Scientific calculations
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Team mini 9 main specialties
Require a team of 30 persons full time
Work on numerous projects
Involvement in design construction supervision and monitoring
Sustainability = • TO of 2 à 4 M$/Year • Number = Budget / TO • For a period of 15 years
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Aoulouz (1991, H=80m) One of the first large RCC dams
50%
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Construction stage Supervision by the government agency
Presence of expatriate technical staff (decreasing with time)
Encouraging local contractors (no specific experience required, but presence of expatriate specialists)
Involvement of the consultant
Assistance to the supervision (RE)
Preparation of construction drawings
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Al Wahda (1996, V=27 Mm3, Q=20 000m3/s) Second largest embkment in Africa
50%
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Benefit Dam design, construction and monitoring is
cheaper compared to similar countries
Development of specific technology
Homogeneity and improvement in the design
Availability of local expertise for any urgent action
Moroccan designers and contractors are present internationally
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Laghrass (1998, H=80m) Arch in karstic foundation
85%
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Asfalou (1998, H=110m) Thin arch in karstic foundation
95%
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Hassan II (2005, H=120m) One of the largest RCC in Africa
100%
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SMBA (1974 et 2006, H=95m)
100%
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R’Mel (2008, H=75m) RCC with no joints
100%
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Conclusion
Very particular experience
Its success is due to the conjunction of multiple factors: 1. Long term voluntarist strategy
2. Highly competent owner
3. Numerous projects well distributed in time
4. Flexible legislation
5. Serious and competent partnerships
Cost savings and expertise availability
Design more suited to local conditions
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SMIR: 1989, First large dam 100% moroccan
Thank you for your attention