From previous studies, it was found that the most important pluviometric indicators which characterize the frequency, intensity
and spatial distribution of drought in Prut River floodplain are the standardized precipitation index, Hellmann’s criterion and Topor
aridity index. Standardized precipitation index values between (-1.5) and (-1.0) indicates a high frequency of the moderate-dry
periods and very dry ones reached 2.3 %. Autumn shows moderate - dry traits in 13.5% of the years and can be very dry only for
9% of the cases from 1979 until 2013. To forecast drought through the standardized precipitation index, it is estimated that if severe
periods occur in autumn, will be extended throughout the winter period and for the whole next (year) growing season. A severe
drought which began in autumn of 2011 remained throughout the winter until the next growing season (2012). To strengthen this
study, a characterization of months using Hellman’s criterion was carried out. The authors laid emphasis on the excessively rainy
months and the excessively dry months, the latter had a higher weight. Topor aridity index results showed a dry substance in 1982,
1985, 1986, 1989, 1992, 1997, 2000, 2002, 2003, 2004, 2006, 2008, 2009, 2011 and 2012 respectively. The incidence of droughts
in the Moldavian Plain resulted in a sharp decrease in the runoff and the appearance of a drying - up phenomenon in the middle
basin of Prut River. Rivers dried up at a frequency of 40 - 50 % in river basins with a surface area of 15 - 20 km2 and over 90 % in
river basins with areas less than 5 km2.