the oecd s private sector participation in water infrastructure checklist for public action could be useful in this regard tvo administrative river basin management units were designated in the danube river basin district which included subbasins of the mura drava and sava rivers and the adriatic river basin district which included the basins of the soca river and all rivers along the adriatic coast to facilitate management every subbasin is divided into smaller units called water bodies surface water and groundwater bodies