عنوان مقاله [English]
Zayandeh-rud basin which is located in central Iran, is one of the areas with serious water instability problems. This research had studied water resources and the use of surface and underground waters on Zayandeh-rud Basin and its relation to instability of water resources in the basin. The method of this research is descriptive-analytic and is based on data analysis of water resources and water use. To evaluate water resources, water storage changes in Zayandeh-rud dam is studied, and the amount of drinking Water allocation, and also industry and agriculture sectors usage were studied. The research results show that Basin water resources have been decreasing in recent decades, while water consumption in the basin have had a different trend. Drinking water consumption has been increasing but water allocation to agricultural sector had substantially decreased. Instability of agricultural water resources has caused the river's course to dry out and also continuous flow of water is ceased and therefore many problems had arisen in relation to the allocation of water to agricultural sectors in the middle and lower area of the Basin. To compensate all of this instability and water shortage, farmers have drilled lots of wells and exploited too much underground water for agriculture, which has intensified the instability and shortage of water resources in the Basin. As this devastating cycle continues, environmental and human sustainability in the Basin will be in serious danger.