RT Journal Article T1 Estudio geohidrológico de la finca «El Piul» (Rivas-Vaciamadrid) Madrid A1 Sastre Merlín, Antonio A1 Vega García, M T. AB The extraction of gravel in fluvial valleys that are below groundwater table, cause the appearance of lakes. The perm an ency of posterior refilling of those lakes can modifice the geohydraulic structure of the afected area. In this paper we explain the hydrogeologycal Impact of one sand gravel: the property "ElPiul" (Rivas-Vaciamadrid, Madrid). PB Sociedad Geológica de España YR 1992 FD 1992 LK http://hdl.handle.net/10272/14122 UL http://hdl.handle.net/10272/14122 LA spa DS Repositorio Institucional de la Universidad de Huelva RD 31 may 2026