Etudes Des Pluies Et Des Intensites Pluviales Des Zones Semi-arides

Résumé: Rainfalls (rain) and its seasonal distribution influence on hydrological system either by annual amounts which quantify the amount or its daily quantities, quantities which cause floods.The increase of the latter because of the rainfalls make it important to predict these phenomenon. The graph of the probability of rainfalls by the graphs of rain intensity, the duration and the repetition more specific which allow to use different of findings (Short values, and more than the base) The information about the rainfalls and the intensity are very important in Hydrology. In case of absence of these data, engineers find difficulties to evaluate it. The application of rain gauge in climatic and geographic zones it may lead to less rigorous results.That s why we choose the hydrological sink Zahrez as a field to apply this study. According to the relation between the intensity,the duration and the repetition, the findings which were taken from the rain gauge of the station of Djelfa, Dar chioukh and Mergueb ben Haffaf of the national agency of water resources of Djelfa in order to identify the relation between the intensity of rainfalls,the duration and the repetition to know the intensity of the rainfalls of the sink of Zahrez but the findings that we have just cover the duration 1971/1972 to 2002/2003.This experiment of these three samples shows good results. The aim of this work is to make a method to know rainfalls and its intensity in case of the absence of the findings of this semi-dry region Zahrez. Also, it provides and gives to technicians means of work to prepare dams (dams,irritated areas,sewage

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