SECTION B: ANSWER ANY FOUR (4) QUESTIONS QUESTION TWO Bethlehem Hydro Project, South Africa Aurecon was appointed to undertake the detailed design and project management duties for two mini hydro stations, one at Merino and the other at Sol Plaatje. At the Marino site an eight metre high mass concrete weir diverts water to a canal. Overcoming hydraulic and geotechnical challenges, Aurecon designed the diversion structure to achieve the required spillway length. The layout of the power station for the Sol Plaatje Dam differed significantly from that conceptualized at the feasibility study stage, achieving increased efficiency and generation output. During the detailed design stage, the layouts were optimized to increase the generating head and minimize hydraulic head losses in the conveyance system. This was done in a cost-effective manner, improving the annual energy production for low additional capital costs. Also, due to unforeseen geological conditions, the layout at Merino was changed to minimize construction costs. Deep excavations were undertaken to provide the required back pressure on the turbine blades and thus minimize the cavitation possibility as part load conditions. An ingenious horseshoe type spillway was designed to cater for possible floods within a restricted space. The Bethlehem Hydro project was constructed to international standards and is considered a ground-breaking sustainable project. Required: a) Describe the difference between Risks and Uncertainty in relation to the Bethlehem Hydro project. (5 MARKS) b) Recent projects have indicated that planning and controlling project risk is critical to secure high quality project outcomes in today's fast paced environment. Cite five positives from this statement. (5 MARKS) c) When is a force majeure event a condition of risk or uncertainty? (5 MARKS) d) List the causes of Uncertainty on Projects (5 MARKS) [TOTAL: 20 MARKS] SECTION B: ANSWER ANY FOUR (4) QUESTIONS QUESTION TWO Bethlehem Hydro Project, South Africa Aurecon was appointed to undertake the detailed design and project management duties for two mini hydro stations, one at Merino and the other at Sol Plaatje. At the Marino site an eight metre high mass concrete weir diverts water to a canal. Overcoming hydraulic and geotechnical challenges, Aurecon designed the diversion structure to achieve the required spillway length. The layout of the power station for the Sol Plaatje Dam differed significantly from that conceptualized at the feasibility study stage, achieving increased efficiency and generation output. During the detailed design stage, the layouts were optimized to increase the generating head and minimize hydraulic head losses in the conveyance system. This was done in a cost-effective manner, improving the annual energy production for low additional capital costs. Also, due to unforeseen geological conditions, the layout at Merino was changed to minimize construction costs. Deep excavations were undertaken to provide the required back pressure on the turbine blades and thus minimize the cavitation possibility as part load conditions. An ingenious horseshoe type spillway was designed to cater for possible floods within a restricted space. The Bethlehem Hydro project was constructed to international standards and is considered a ground-breaking sustainable project. Required: a) Describe the difference between Risks and Uncertainty in relation to the Bethlehem Hydro project. (5 MARKS) b) Recent projects have indicated that planning and controlling project risk is critical to secure high quality project outcomes in today's fast paced environment. Cite five positives from this statement. (5 MARKS) c) When is a force majeure event a condition of risk or uncertainty? (5 MARKS) d) List the causes of Uncertainty on Projects (5 MARKS) [TOTAL: 20 MARKS]
