The correct response would be: "There is a large drop, so the water will have a lot of potential energy to transfer to the turbine."
In hydroelectric dams, turbines are typically located at a height where there is a significant difference in elevation (or drop), allowing the water to possess a large amount of potential energy. When the water flows down this drop, that potential energy is converted into kinetic energy, which can then be used to turn the turbines and generate electricity.