1. Freshwater: This is the most general term, referring to water that is not salty. It encompasses all sources of water that are suitable for human consumption and most uses, including rivers, lakes, groundwater, and rainwater.
2. Potable Water: This specifically refers to water that is safe for human consumption. It undergoes treatment to remove contaminants and meet specific purity standards.
3. Available Water: This term emphasizes the accessibility and practicality of using water resources. It takes into account factors like extraction costs, environmental impacts, and competing demands.
4. Consumptive Use Water: This refers to water that is removed from a source and not returned to it, such as water used for irrigation or industrial processes.
5. Renewable Water Resources: This focuses on the sustainability of water use. It includes precipitation, surface water, and groundwater that are replenished naturally within a given timeframe.
6. Blue Water: This term is often used in water resource management and refers to surface water sources like rivers, lakes, and reservoirs.
7. Green Water: This refers to rainwater that is stored in the soil and used by plants.
The best term for "usable water" depends on your specific needs and the context of your discussion.