عنوان مقاله [English]
The water source is known the most important source and potential of environmental. Any aera is not in earth's surface, that it area be have the all resources Inside his, and it is necessary to put some resources from outside the region. So in each area should planning is in such a way, that it plan to make maximum use of water resources, considering the amount of precipitation and water resources exploitable.
Different methods have been proposed to achieve this goal, but the best way, way is that it way to be more consistent with the nature each region. The surface of the earth as an interface with climate, in the form, that this forms are a logical reaction surface of the earth in response to climatic factors. One element of climate is precipitation and one of this forms, is a network of water ways. The drainage area is a reflection of the status of precipitation, infiltration, evaporation and runoff area. Therefore, the study of the drainage area will be notified of the backlash against the environmental conditions affecting runoff. Such features drainage can be noted the density, pattern, drainage classification status etc. In this paper, we understand the difference between the response to rainfall, with the use of state rankings on both sides of the river channel and its difference. Preliminary results indicate that slopes Nesar have the channel density of the lower and the river order less in the junction of the main river.