摘要：Safety and Risk determined by Vârşolţ Reservoir, Crasna River . The drainage basin of the Crasna River is complex organized. Along this river, the reservoir Vârşolţ is the most important objective and has various functions. For the safety of the reservoir, hydrometeorological elements of the drainage basin from upstream side of the river were under continuous monitoring: sediments settling to the lake bed, infiltration through dam and the constriction of the dam materials. The induced risks by the presence of water body derive from generation of dangerous hydrometeorological phenomena, decreasing of lacustrine accumulation capacity, alteration of water quality, collapse of the dam. These phenomena generate flash flood waves of high magnitude and barrage break wave, which affect capacity of drinkable water supply and alter the environment equilibrium. The potential loses are very important and have ecological, economical and human implications. The existence of water retention has many beneficial effects for the social and economical life
关键词：hydrographic basin; hydrologic regime; colmatage; water quality; dam; risk; ;damage
