Two sampling points were selected for the rivers Kompsatos (KOM1,KOM2) and Aspropotamos (ASP1,ASP2), and one sampling point for each of the Kosynthos (KOSY) and Lissos (LISS) rivers. Eight more sampling points were selected in various small streams (STR1-STR4) and drainage
canals (DRC1-DRC4) of the basin