The overall planning of mechanical grid water resources is a process that needs to promote the equal development and management of water, land and related resources, and adopt an equal and sustainable way to achieve relatively large economic and social benefits. Now we are not considering our competing interests with future generations in water management and planning. Surrounding environmental and social issues, a new definition of sustainable water development is needed to expand the traditional supply and demand channels. Appropriate methods to evaluate all aspects of sustainability, especially detailed engineering analysis, are necessary.

Although the direct motivation for water reuse may be different in different situations, the overall goal is to form a water cycle in a very small area. In this way, the wastewater is properly treated and turned into a valuable resource instead of being disposed of as garbage. In many cases, water reuse is feasible, but due to natural, political, or economic constraints, other water sources are not feasible, and attempts to reduce water use are also not feasible.

An important breakthrough in the sustainable development of mechanical grid water resources is when water regeneration and reuse are used as a method to meet water needs. Water regeneration and reuse are also economically and technically challenging methods, because the water used for reuse is usually of poor water quality. Therefore, in-depth treatment is widely used, often surpassing the pure end-use water demand. One goal of the end-use water is to alleviate people's concerns about health and make reused water a good water choice for the public. The requirements for reclaimed water (such as advanced treatment and separate distribution systems) make water reuse expensive, which limits its wide range of applications .

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