INTRODUCTION Seville is located 80 km land inwards and it is Spain’s only commercial river port. Access is along the Rio Guadalquivir. The current dimensions and depth of the port impose limitations on the breadth and draughts of the vessels that use it, putting the future of the port at risk. So the Port Authority developed a New Maritime Approach that provides for the deepening and widening of the approaches to the port. Studies have shown that the optimal nominal water depth based on economic, technical and sustainability criteria is 8.5 meters. The first phase of the plan includes the construction of a new lock to the south of the present one that will be 40 m wide, 450 m long and 11 m deep. During the secondphase, the Rio Guadalquivir will be deepened to 8.50 meters to

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