Assessment of temporal and spatial variation of groundwater level relative to distance from Zayandehrud river (Case study: Koohpaye- Segzi plain of Isfahan)

The aim of this study is to evaluate groundwater resources of the koohpaye-segzi Plain and its reaction rather to different parameter changes such as distance from the river of zayanderood. Then, the impacts of the input stream flow to the region, precipitation, evaporation, the mean temperature and deflation from the water table on the plain water table were assessed for the 1996 to 2010 time period. The results showed that the level of water table has been declined 3.5 meters in average during this time scale. This declination rate has spatially increased, especially in the 30 kilometers of the first part of Zayanderood river and have reached to over 14 meters. Furthermore, the results showed the water level depths of wells located within the 6 km strip width from the river are strongly influenced by discharge fluctuations during the year, and with increasing the distance from the river is reduced. A drastic reduction in input flow at the beginning of the plain has caused increasingly pressure on the groundwater resources (near the bridge Choom) for agricultural activities. At the end part of the river (near the bridge Varzaneh) by decreasing stream flow and consequently declining of water table and quality of groundwater resources, agricultural activities have been disrupted that makes less declining rather than the initial region and causing many socio-economic problems in the Koohpaye-Segzi Plain.The aim of this study is to evaluate groundwater resources of the koohpaye-segzi Plain and its reaction rather to different parameter changes such as distance from the river of zayanderood. Then, the impacts of the input stream flow to the region, precipitation, evaporation, the mean temperature and deflation from the water table on the plain water table were assessed for the 1996 to 2010 time period. The results showed that the level of water table has been declined 3.5 meters in average during this time scale. This declination rate has spatially increased, especially in the 30 kilometers of the first part of Zayanderood river and have reached to over 14 meters. Furthermore, the results showed the water level depths of wells located within the 6 km strip width from the river are strongly influenced by discharge fluctuations during the year, and with increasing the distance from the river is reduced. A drastic reduction in input flow at the beginning of the plain has caused increasingly pressure on the groundwater resources (near the bridge Choom) for agricultural activities. At the end part of the river (near the bridge Varzaneh) by decreasing stream flow and consequently declining of water table and quality of groundwater resources, agricultural activities have been disrupted that makes less declining rather than the initial region and causing many socio-economic problems in the Koohpaye-Segzi Plain.The aim of this study is to evaluate groundwater resources of the koohpaye-segzi Plain and its reaction rather to different parameter changes such as distance from the river of zayanderood. Then, the impacts of the input stream flow to the region, precipitation, evaporation, the mean temperature and deflation from the water table on the plain water table were assessed for the 1996 to 2010 time period. The results showed that the level of water table has been declined 3.5 meters in average during this time scale. This declination rate has spatially increased, especially in the 30 kilometers of the first part of Zayanderood river and have reached to over 14 meters. Furthermore, the results showed the water level depths of wells located within the 6 km strip width from the river are strongly influenced by discharge fluctuations during the year, and with increasing the distance from the river is reduced. A drastic reduction in input flow at the beginning of the plain has caused increasingly pressure on the groundwater resources (near the bridge Choom) for agricultural activities. At the end part of the river (near the bridge Varzaneh) by decreasing stream flow and consequently declining of water table and quality of groundwater resources, agricultural activities have been disrupted that makes less declining rather than the initial region and causing many socio-economic problems in the Koohpaye-Segzi Plain.The aim of this study is to evaluate groundwater resources of the koohpaye-segzi Plain and its reaction rather to different parameter changes such as distance from the river of zayanderood. Then, the impacts of the input stream flow to the region, precipitation, evaporation, the mean temperature and deflation from the water table on the plain water table were assessed for the 1996 to 2010 time period. The results showed that the level of water table has been declined 3.5 meters in average during this time scale. This declination rate has spatially increased, especially in the 30 kilometers of the first part of Zayanderood river and have reached to over 14 meters. Furthermore, the results showed the water level depths of wells located within the 6 km strip width from the river are strongly influenced by discharge fluctuations during the year, and with increasing the distance from the river is reduced. A drastic reduction in input flow at the beginning of the plain has caused increasingly pressure on the groundwater resources (near the bridge Choom) for agricultural activities. At the end part of the river (near the bridge Varzaneh) by decreasing stream flow and consequently declining of water table and quality of groundwater resources, agricultural activities have been disrupted that makes less declining rather than the initial region and causing many socio-economic problems in the Koohpaye-Segzi Plain.