Abstract
Rainfall date obtained for thirty-two meteorological stations distributed in Iraq to find the rainfall returns period, which contributes in the improvement of water management plans all over Iraq, especially during dry seasons. Mean annual summation of rainfall has a symmetrical increasing pattern from southern west towards northern east, according to the increasing ratio of rainfall in the northern region of Iraq. The northern east region of Iraq has characterized by very abnormal and abnormal events regarding rainfall (P) in term of return periods, while the northern west, middle and southern regions characterize by a normal distribution of rainfall. , Iraq has only two types of weather conditions, according to rainfall returns periods: the humid weather condition located in the northern east part and dry weather condition in the other parts of it.
Highlights
Rainfall is one among the main components of hydrological cycle and is considered as principle source of water to the earth [1]
The selection of the probability of exceedance (Px) or return period (T x) for design purposes is related to the damage the excess or the shortage of rainfall may cause, the risk one wants to accept and the lifetime of the project
Table 1 and Fig. 1 show the geographical position of meteorological stations distributed in Iraq
Summary
Rainfall is one among the main components of hydrological cycle and is considered as principle source of water to the earth [1]. The return period ( called the recurrence interval) is the period expressed in a number of years in which the annual observation is expected to return. The climate of Iraq is generally as continental and subtropical semi-arid type whereas the mountainous regions are classified a Mediterranean climate. It is characterized by a very hot summer and a short cold winter and by the breadth of the daily and annual temperature because of the lack of large water bodies that reduce the coldness of winter and summer heat [5]. Earlier studies did not indicate using annual rainfall to study returns periods all over Iraq while one research has been found using this technique within the north of Iraq [6]
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