This course consists of 5 modules covering the GSAS Water category and its criteria. The natural water cycle is a system in which water resources are continuously exchanged between the atmosphere, soil water, surface water, ground water, and plants. This cycle treats and recharges freshwater supplies. Human consumption of fresh water outpaces the natural cycle and under these circumstances, water cannot be considered as a renewable resource. Sustainable practices for the efficient use of water, the collection, recycling and reuse of water to mitigate environmental impacts associated with water scarcity and depletion.