Hydrology,is the Study of the movement, distributon, and quality of water on earth and other planets, including the hydrologic cycle, water resources and environmental watershed sustainablility. groundwater is water that comes from the ground. Sound easy, doesn't it? Amazingly, many people use groundwater but don't even know it. Water conservation refers to reducing the usage of water and recycling of waste water for different purposes such as cleaning, manufacturing, and agricultural irrigation.