What is the difference between water quality and water quantity?

Water quality involves assessing the chemical, physical, and biological characteristics of water, which determines its suitability for various uses, such as drinking, recreation, and supporting aquatic life. For instance, water quality is influenced by variables such as pH, temperature, dissolved oxygen, nutrients, and the presence of contaminants, including pathogens and heavy metals.

On the other hand, water quantity refers to the volume of water available in a certain area. This can encompass measurements such as flow rates in rivers, levels in lakes, or groundwater reserves. Understanding water quantity is crucial for water resource management, especially in contexts where supply may be limited or highly variable due to factors like seasonal changes or human consumption.

The distinction highlighted in the correct answer is fundamental to water resource management and planning, as effective strategies must consider both the quality and the quantity of water to ensure safe and sustainable usage for various applications.