Considering the fact that the gravel pits have the same water level as the groundwater, variance of the groundwater level is an important factor to project the gravel pits utilization for recreation activities. Some gravel pits located in the east part of Bratislava are suitable for recreation purposes. The groundwater level in this area is influenced by subsurface flow coming from the slope of the Small Carpathians and by the water level in the river Danube. We have determined the relation between the water stage in the Danube river of Bratislava gauge and the groundwater level of three bored holes nearest to the gravel pits (Štrkovec, Kuchajda). The highest correlation coefficient (tab. 1) has been estimated by means of an assynchrone correlation analysis. The change of the groundwater level caused by 1 meter change of the water stage in Danube and its lag-time has been determined as well.