Drawing geometric characteristics of subterranean structures and remove evaporated with tilt shift (Case Study: Sansan village, Kashan)

according to some researches, Iran is in greatest and worst drought in its 30 years. Kashan plain basin is one of the critical areas that has water loss and progressive destruction of agriculture due to the lack of management on the use of groundwater resources. one of the most important inventions of Iranians that has long been an effective factor in management of water resources from the past has been ghanat. in this reaserch has been tried to improve water resources management by study of sansan's qanat around Kashan. so due to the structural cognition of qanat , the depth of wells were determined according to the laws of free fall. it resulted in inefficiency of the method and the cause was scribed in detail. again the depth and hydraulic slope was determined by rope and the length measurement tool. therefor qanat's schema was drawn in three particle: the elementary, middle and end that was the first of its kind. the results of tilt-shift on the rise in water flow and losses from evaporation was studied that it is considering the possibility of increasing freshwater by five folds.