Since human activity is about to outgrow the natural capacity, thus becoming a prominent affector to the environment, an urban/regional water system that minimizes influence on the environment, but at the same time, satisfies the human needs must be considered. This is necessary to keep well being urban/industrial areas side-by-side with the external nature. To address this problem, new systems of water and wastewater treatment as well as new methods of water utilization are coming up. The considerations and issues related to the planning and design of such water systems are discussed in this paper.

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