Doppler Weather Radar (DWR) is used to measure the areal rainfall and other dimensional structures of precipitating systems then rainfall is one of vital factors to study or improve efficiency of artificial rains. To do an analysis, we need data which represents quantity and distribution of rainfall based on any time and regions more than data of rainfall at specific area.Because rainfall constitutes the main source of water for the terrestrial hydrological process, accurate measurement and prediction of the spatial and temporal distribution of the rainfall is a basic issue in meteorology. A huge basin of a river is a good location that represents rainfall based on quantity and distribution in an immense area. However, finding a good representative of actual rainfalls with correctness and reliability is so difficult. This may be naturally caused by a high variation based on time and considered area. For example, there is some raining in one side of the road but which not in another side. Therefore, the measurement of rainfalls by using some standard rain gauges is not good representative of actual rainfalls in that area.
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