zahra javadzadeh

Population growth over the last decades and consequently the need for food, have led humans to dominate more cultivated land. Inevitably, these lands require water, which can be possible by controlling the rivers water by constructing dams. Finding suitable land for agricultural purposes in a way that suitable conditions for cultivation and also water required for it can be provided by various methods such as controlling surface water (dam) and underground water (well drilling, etc.) It has always been the attention of experts. In this study, the feasibility of suitable agricultural lands in the upstream of the Javeh dam has been investigated. Accordingly, by assuming pumping water with different heads from the pumping station in the dam reservoir, taking into account different factors (slope, head, distance and land use), the site selection has been carried out. Spatial analysis was performed using ArcGIS software. By overlapping the factor maps and weighting each one of them, the appropriate ranges are derived based on the defined factors. The results show that by increasing the head twofold, the area of the selected range is almost doubled, while by increasing the head fourfold , the area of the selected range increases about six times. It should be noted that in this study, verification of the selected areas has done by using satellite images.

The aim of this study is to assess effective factors in flooding and determine vulnerable areas in first and third Tehran Municipality areas, therefore suggest the proper management ways to avoid this disaster. Flooding disaster could have serious financial and fatal casualties, specially in urban areas. To reduce damages and hurts of flooding in these areas, hydrological, topographical, human features and … were used as separated layers in GIS and they were prioritized with a method like AHP. As the results areas with risks of flooding were determined. In this study the areas with high risks and low risks were recognized. Studying area was classified into five different classes and their areas were calculated. The very high risk area occurs in 16.21 square kilometer and respectively 19.11, 17.06, 9.67 and 1.84 square kilometer of areas were classified as high, medium, low and very low risks areas. By using this information, there could be proper plans and strategies to control floods and even utilizing flood water.