Natural water catchment areas

the delimitation and codification of the first order of river basins throughout the region is provided for in Legislative Decree No 152 of 11 May 1999 on the protection of waters against pollution and transposition of Directive 91/271/EEC. The delimitation reflects the concept of a basin as a superficial pattern of outflow in the strict sense (dir. eur. 2000/60/EC).本区域内所有一级流域的划定与编码工作，均依据1999年5月11日第152号立法政令开展，该政令旨在保护水体免受污染并落实欧盟指令91/271/EEC的国内转化要求。本次流域划定遵循欧盟指令2000/60/EC中定义的严格意义上的地表径流汇水流域概念。