The scientists studied a rocky underground water source in Ghana to understand how much water can be safely taken out for different uses. They found that the water source is uneven, with some areas having more water flow than others. They also discovered that the water source can support more irrigation projects, but if the amount of rain that refills the water source decreases, people can only take out a limited amount of water. To manage the water source well, more research is needed to figure out how much water can be taken out without harming the environment.