What aspect of sustainable design focuses on conserving water resources?

The aspect of sustainable design that focuses specifically on conserving water resources is Water Efficiency. This concept encompasses strategies and practices aimed at reducing water use and improving the quality of water utilized in buildings and landscapes. Effective water efficiency measures may include installations of low-flow fixtures, rainwater harvesting systems, greywater recycling, and drought-resistant landscaping. By prioritizing water efficiency, architects and designers can significantly contribute to the preservation of this vital resource, which is essential to sustainable development.

The other options, while related to sustainability, do not concentrate on water conservation. Energy and Atmosphere deals with reducing energy consumption and improving energy efficiency in buildings. Material Efficiency concerns the sustainable use of materials, reducing waste and promoting the recycling of resources. Site Design focuses on how a building site is arranged and how natural resources are used or preserved, but it is more about land use and planning rather than specifically targeting water conservation.