The System Investigate of Active Mechanisms on the Urban Water Per Capita and Water Resources Allocated to it with Priority Sustainable Development (Case Study: City of Birjand)

Considering the increasing development of population and water demand and continuous droughts and lack of rainfall¡ water crisis especially in the arid regions of Iran has become to a fundamental problem. One of important solutions to deal with this crisis in the urban sector¡ is the management of demand and water consumption that this requires to recognition of effective mechanisms on consumption and water demand in the consumable sector in order to the realization of managers and planners goals in the field of comprehensive and integrated management of water resources. This study has been done to systematic investigate structural patterns governing on the per capita of municipal water in the Birjand city situated in South Khorasan province and with using Vensim software to achieve the sustainable development of in the field of municipal water during the years 2008-2013. The results show that with existing continued consumption patterns in the region the citizens per capita water consumption is increasing and cause decline in groundwater level Birjand plan. Also can found that the use of government policies in the water sector and also savings in the consumption by citizens at the same time¡ on average With decreasing 30.03 percent In the per capita urban water compared to the existing consumption pattern¡ as an effective way in changing of consumption patterns and consequently the control of urban water consumption¡ significantly can decrease Increasing trend groundwater levels decline in to an average of 28.47 percent in the rigion.