Land Use Planning in the Urban Sensitive Areas Case Study, Farahzad Valley Stream-Tehran

Extended 1-Introduction As an important fundamental Issue in urban planning, land use suitability assessment provides important reference for planning, planning management, planning implementation and planning evaluation. Whether at home or abroad, many scholars and planning workers have made in-depth study and explore at the approaches of land suitability assessment, especially in the use of GIS technology. Land use suitability assessment is an important fundamental work in urban planning. Be restricted by technology and means, qualitative analysis methods are wider used in evaluating land use suitability. It is necessary to explore a quantitative evaluation method to provide a reliable basis for in-depth analysis of urban planning and improve the persuasiveness of the decision-making and objectivity and science of the urban planning. 2-Theoritical BasesUrban valley stream is one of the important factors in making structural and functional evolutions of cities. In these natural corridors, in addition to, permanent or periodic flow of water, visual and natural values, as well as different function/ action pattern -in the form of tourism- recreation, economical functions, and even human life- are existed. In theories related to urban sustainable development, optimum utilization of these areas in the framework of sensitive areas and urban vital plans is considered by urban institution. Urban Managers are using a number of programs and policies to guide and control growth in the urban valley streams. These growth management measures include such policies as:Smart growth programs - includes a range of approaches to contain development by using more efficient and compact urban development patterns that preserve open space and protect environmentally sensitive areas.Alternative zoning ordinances-These can be used to protect forests, wetlands, floodplains, or environmentally sensitive land. There are several different forms of alternative zoning ordinances likes Floating zones, Overlay zones, Cluster development, Incentive zones and Impact fees.Transferable development rights (TDR)-Under this program, a landowner is assigned rights to develop which cannot be used on sensitive land but can be transferred to other land or sold to other developers.Purchase of development rights (PDR)-Under this program, landowners can volunteer to sell the development rights to their land to the local government or a nonprofit group while retaining ownership of the land. The current and future owners of the land are restricted from development activities.Conservation easements-Con