Abstract. - Study of Rainfall Periods in the Crasna Basin Until the Confluence with Zalau. The rainfall periods in the Crasna Basin were determined using the weighted anomaly standardized precipitation (WASP). We processed and analyzed data from the period between 1990-2000 from one meteorological station and eight rainfall stations. WASP values were calculated for intervals of one year and of six months (semesters). The frequency analysis was done on three domains of the precipitation periods (rainy, normal and dry). The rainfall risk characterization was studied on three groups: risk by excess, risk by deficiency and free of risk. By analyzing the resulting rainfall periods the wet domains have the predominant share followed by the normal and dry domains. The frequency analysis of the group with risk and without risk indicate a net predominance of situations without rainfall risk. In the spatial distribution of exceeding rainfall periods appear some contrasts, determined by the positions of stations and posts regarding the prevailing western air masses advections.
Key words: rainfall periods, classes, fields, rainfall risk groups
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