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1.4. The Challenges There are many challenges to be faced in the implementation of projects but right-of-way or resettlement was not an issue here; all of the work will be done within the existing reservoir. That however, leads to the first challenge. The work is to be done inside the reservoir where the water levels fluctuate during the year from the wet to dry seasons. The construction window when it is safe to work within the reservoir is a very limited window. The second challenge is that the main closure dike is to be constructed on very soft sedimentation deposits that have accumulated over the years to a depth over 20m. First Challenge – Construction Window The first challenge, related to the water level, is when can construction start and how long construction can continue until. As seen in the historic fluctuation of water levels below, the timing of drawdown of the reservoir varies over several months. 508