To study any area that should determine its astronomical (coordinate) location and geographical location, and the problem of the study is that the climatic elements have an impact on changing the natural characteristics of the study area, and what is the relationship between the amount of rain falling and evaporation in the iron periods of surplus and water deficit, but the satisfaction of the research is that the climatic elements have the obvious effect in changing the characteristics of the different nature of the study area, and The amount of rainfall, high temperatures and evaporation play an important role in calculating periods of excess and water deficits.