General objective: Improving the degree of protection and conservation of the state of ecosystems for habitats of conservation interest and species of community importance in the Danube Delta Biosphere Reserve (RBDD) by ensuring optimal water circulation in the water complexes Dunavat-Dranov, Razim-Sinoie; Sinoie-Istria-Nuntasi area’,.Colmatation of canals and guilds in the Danube Delta is a natural process that also formed the basis for the architecture of the aquatic complexes between the three branches at the mouth of the Danube. However, beyond this natural process, anthropogenic interventions prior to the 1990s were not aimed at maintaining the quality of delta habitats, but at rapid access to certain areas. The channels created by man in the past have altered the hydrological system so that today there is an accelerated process of clogging certain channels and guillotines in certain areas. The effect on the integrity of habitats in these areas is often