ESTIMATING AQUIFER RECHARGE RATES BY USING OF MEASURES OF 3H/3HE AGES AND GROUNDWATER LEVELS IN THE SOUTHEAST OF BUENOS AIRES PROVINCE, ARGENTINA

ORLANDO MAURICIO QUIROZ LONDOÑO; DANIEL EMILIO MARTINEZ; ELISE FOURRER; PIERE JEAN- BAPTISTE; A. DAPOIGNY

Viena

Simposio; International Symposyum on Issotope Hydrology ?Revisiting foundations and exploring frontiers?.; 2015

OIEA

Groundwater recharge can be understood as the process where rainwater infiltrates into the soil, travelling through the unsaturated zone and reaching the aquifer. Identification and quantification of this parameter is of vital importance for planning and managing water resources. For calculate the recharge rate in the Pampean aquifer, were used groundwater samples at three different depths, determining through 3H/3He measurements his transit time. The values of recharge were estimated by using interface method. The results were compared with the values obtained by using water table fluctuation methodology. The found recharge values range from 10 to 23 % of the total rainfall with a mean value of 14%. These values were coincident with recharge values previously obtained in the area of study applying other methodologies.