Mouataz T. Mostafa

The complexity of the chemical composition and the presence of pollutants, such as heavy metals, pose a significant challenge when it comes to the safety of using certain materials or wastewater for reuse or groundwater recharge. Heavy metals, such as lead, cadmium, and mercury, can have long-term negative effects on ecosystems, human health, and water quality, even in very low concentrations. If these pollutants are present in wastewater or soil, they can lead to contamination of groundwater, further compromising the quality of drinking water and ecological balance.

The complex chemical composition may also indicate the presence of other toxic or difficult-to-degrade substances that can accumulate in the soil and water, creating long-term risks. Due to these factors, it is essential to conduct thorough research and risk assessments to ensure the safety of reuse or groundwater recharge processes, minimizing the negative environmental impact. It is recommended to use efficient treatment methods to remove these pollutants before any material is used for these purposes.

Today, the rapidly developing and changing structure of cities emphasizes the fact that water is one of the basic needs. Considering that water is the main source of life, sustainable management of water is critical for the future of cities. As the world's population grows rapidly, cities are using water resources more intensively than ever before. Water plays an important role not only in sustaining human life but also in the activities of various sectors such as industry, commerce, agriculture, and tourism. Global climate changes, increasing population, and difficulties in accessing water resources have caused the relationship between sustainable cities and water to become more critical than ever before. If the current situation of the urban water cycle continues, urbanites and nature will be more exposed to disasters brought about by the climate crisis. Therefore, the current situation between the city and water should be examined and measures should be taken, if it is insufficient, it should be improved. Sustainability is a concept that is of increasing importance today. Factors such as urbanization and population growth require more effective management of water resources. Thanks to this research, findings will be obtained on how the relationship between sustainable cities and water can be improved against the climate crisis. In this study, the relationship between sustainable cities and water; If the current situation of the urban water cycle continues,how it will affect the citizens in the future, and what can be done to minimize the negative impact of the global climate crisis for water management in sustainable cities .

Since water is essential for sustaining life, its importance and the way it is distributed to cities are becoming increasingly important. This requires economic means due to the future population increase.