The focus of this paper is on new town building in hydro drought regions. It looks at new town building from the sustainability perspective; especially it discusses the supply and distribution of water in the new towns. The aim of this paper is to resolve a dilemma in the arid regions. One side a much demand for new towns because of the population growth and other side the water anxiety is being a key reason hindering the urban development. Methodological approaches of this paper is to supply some volumes of the required water for a new town in the south of Iran called for Ramshar with the help of intense and devastating, but rare regional rains. The aim is to supply water from the rains and store it in a covered lake near Ramshar. This paper conducts a case study to find the reasons of depletion of the regional water resources, to apply the hydraulic routing method, to make the storage, and to use the water according to a hydrosocial change balance program timely. This paper suggests the practical model to supply water before every new town building. The model is a supportive and feasible tool to overcome the serious dilemma everywhere similar Ramshar
Key words: New town, water resources, sustainable development, drought, flood routing, hydro social change balance.
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